hybridfree/eevblog-posts huggingface dataset:
Is that a Zener? Component finding time! - Page 1
Forum section: electronics / beginners

author: TrickyNekro
author_rank: Frequent Contributor
timestamp: November 13, 2021, 09:24:54 pm
content: Hi!I have searched! But I have, up to now, found nothing. Well it is designated as a zener ( VR6 - for voltage regulator I would guess ),it behaves as a zener ( forward voltage drop of a diode and reverse zener voltage of ~2V ), but should it behave like this?This is part of a crowbar circuit. It uses in series as I pronounce them; a 1k5 resistor, the zener, a 20k resistor. The anode of the zenerand the one lead of the resistor is connected to the gates of two crowbar N-Channel MOSFETs. One is clamping the output of a regulator,and the other the enable of the regulator.The regulator is outputing ~13.65V from a ~15V rail. The 1k5 is powered from the unregulated rail.The "problem" is that unless something is pulling the gates of the mosfets low to keep them de-activated, as it is the circuit would always clamp.The second problem is that I have no idea, whether or not the zener is a bit shot.If there is a transistor pulling the gates low, it makes sense for the "zener" to be a 2V zener. If there is nothing pulling the transistors low,then the zener is probably shot. It would then make sense for it to be a 12V zener or higher so that the crowbar is activated in case the rail overshootssignificantly.So the Zener is marked "T 2L". It is designated as a VR, so most probably Voltage Regulator, which fits the function of a zener. A photo of the zener below!Help a poor repair engineer find his zener!

author: golden_labels
author_rank: Super Contributor
timestamp: November 13, 2021, 10:56:47 pm
content: Does its location and possible function fit a TVS? If yes: perhapsONSemiconductor ESD9P5.0ST5G?

author: TrickyNekro
author_rank: Frequent Contributor
timestamp: November 14, 2021, 07:57:58 am
content: Quote from: golden_labels on November 13, 2021, 10:56:47 pmAh sorry I didn´t mention that... the package is a SOD123. Does it make sense for it to be a TVS? Yes, although the designation is VR and I think they designate TVSon the board with CR so, probably it isn´t.
Is the BC517 transistor a suitable replacement for the MPS-A13 transistor? - Page 1
Forum section: electronics / beginners

author: ee90099
author_rank: Newbie
timestamp: October 14, 2016, 05:04:14 am
content: Hi everyone,I've been working on restoring an old Gotlieb pinball machine and had a few questions about hfe of transistors. The original machine used a MPSA13 transistor which is no longer readily available and I need to find a substitute part. After searching digikey, I believe that a BC517 transistor would be a suitable replacement. However, one of the things that I'm having a hard time understanding is the hfe on the datasheets. The MPSA13 shows a minimum/maximum hfe of 5,000 and 10,000 at Ic=10ma and Ic=100ma while the BC517 has a minimum hfe of 30,000 at Ic=20mA. I typically look at the curves when determining hfe, and the graphs for each transistor show an hfe of 100 at Vce=5V and Ic=10mA. So where are these high gains that are shown in the datasheet tables coming from?Here's a link to the two datasheets:https://www.fairchildsemi.com/datasheets/BC/BC517.pdfhttps://media.digikey.com/pdf/Data%20Sheets/Fairchild%20PDFs/MPSA13Rev2007.pdfAlso, does anyone see any issue that I've missed with using the BC517 in replacement of the MPSA13?

author: Keicar
author_rank: Regular Contributor
timestamp: October 14, 2016, 05:21:39 am
content: If you look at the Y-axis label, you'll see a '(K)' on the end - so the Hfe value you're reading as 100 is actually 100,000 - which is exactly as you'd expect for a darlington pair.

author: ee90099
author_rank: Newbie
timestamp: October 14, 2016, 05:25:27 am
content: ThanksAnything else dumb that I've missed?

author: Keicar
author_rank: Regular Contributor
timestamp: October 14, 2016, 05:44:57 am
content: All good, I'm no expert myself. I think that both of these part numbers are sorted from the same production process (hence the 'sourced from process 05' on both datasheets) - they're basically the same part. The lower gain ones are marked as MPSA13, the higher gain ones as MPSA14/BC517. Anyway, I'd imagine that for a switching application especially (as I suspect this may be), the precise gain values are of little consequence and the higher gain version could be substituted without a problem.
Is the compensator output on DSO protected? - Page 1
Forum section: electronics / beginners

author: truhlik_fredy
author_rank: Regular Contributor
timestamp: February 19, 2011, 01:36:29 pm
content: At the moment I want for one-off usage (perhaps 20minutes) a simple function generator. And I have Rigol DS1052E, there is the compensator output for adjusting probes. It's 1Khz and its suits my needs very well. But I don't know how well its protected, like when I will draw to much current, or short it out. The device should not draw much current but just for the case. Its silly idea and I don't want to regret it.

author: Simon
author_rank: Unknown
timestamp: February 19, 2011, 02:05:21 pm
content: well as mine mysteriously does not work anymore I would say no. My only explanation for mine is that I accidently shorted it. I suggest using a buffer just to be safe, Failing that throw a 555 timer circuit together or use an MCU

author: truhlik_fredy
author_rank: Regular Contributor
timestamp: February 19, 2011, 04:25:19 pm
content: Quote from: Simon on February 19, 2011, 02:05:21 pmI will make MCU one, just I had this lazy evil thought to make shortcut and use the compensator for it. Thanks to turning me back(i was close)

author: Simon
author_rank: Unknown
timestamp: February 19, 2011, 04:28:16 pm
content: yea you best use and MCU, it is as easy as flashing a led, no point in risking blowing your scopes calibrator, I've done that somehow

author: saturation
author_rank: Super Contributor
timestamp: February 20, 2011, 04:44:59 pm
content: But if 1 kHz is all you need, just isolate the Rigol's calibration output with a voltage follower op amp to provide driving output to your load. For this app you can use any op amp you have that is anywhere like a 741.But if you do have an op amp handy, just make an oscillator with it, and save your worry:If you don't have an op amp, you aren't picky about the output waveform, you can make an oscillator with any one of at least a transistor, op amp, or logic gates, and then at least a capacitor and some resistors.http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/square.html

author: truhlik_fredy
author_rank: Regular Contributor
timestamp: March 04, 2011, 04:08:44 am
content: Quote from: saturation on February 20, 2011, 04:44:59 pmThanks, I was thinking about something like that but I was afraid that I can touch the ground near by the compensator output and I will short it before it goes to voltage follower. But thanks anyway.

author: tecman
author_rank: Frequent Contributor
timestamp: March 04, 2011, 03:26:56 pm
content: Op amp circuits are nice, but you ideally should have as fast a rise time as practical. Make a simple oscillator with a 74HC04, buffer it with a couple of more inverters in the HC04 and you will have a nice fast rise source.paul
Is the core of a metal-framed transformer usually connected to the frame? - Page 1
Forum section: electronics / beginners

author: calzap
author_rank: Frequent Contributor
timestamp: August 11, 2024, 04:54:45 pm
content: In some cases, the core is part of or constitutes most of the frame. See the first pic. In others, it’s not obvious. See the second and third pics. If core contacts the frame, the transformer is mounted on a metal chassis, and the chassis connects to earth that would connect the core to earth. That should be a safety factor in case a primary conductor contacts the core. If the chassis is not connected to earth ground and the transformer core is connected to the frame, a primary conductor contacting the core could make the equipment dangerous.Mike

author: BrokenYugo
author_rank: Super Contributor
timestamp: August 11, 2024, 07:01:08 pm
content: #2 is a bell transformer with a provided green earthing wire, presumably this a legal transformer and the core is earthed if/as required.#3 is a split bobbin design, I think that might count as double insulated?

author: TimNJ
author_rank: Super Contributor
timestamp: August 12, 2024, 02:03:23 am
content: Consider each transformer on a case-by-case basis. The hi-pot voltages and locations may give you an idea about the level of separation the transformer is designed and manufactured to. If the transformer says it is tested 4000Vac primary-secondary and 2000Vac primary-core and secondary-core, then there is an implied high degree of isolation between the windings and between the windings and the core. Worry about a wire touching the core is probably not necessary. But in general, there is no issue with earthing the bracket/core if you so wish.

author: PGPG
author_rank: Frequent Contributor
timestamp: August 12, 2024, 09:59:42 am
content: Quote from: calzap on August 11, 2024, 04:54:45 pmIf you consider primary conductor being floating inside device and contacting the core you should also consider primary conductor contacting the chassis?

author: calzap
author_rank: Frequent Contributor
timestamp: August 12, 2024, 03:13:56 pm
content: Quote from: PGPG on August 12, 2024, 09:59:42 amYes, that would be standard design procedure if the chassis or any metal connected to the chassis is exposed to touching. And common even if the chassis and any metal connected to it is not exposed to touching.Mike
Is the Elbert V2 FPGA board discontinued? - Page 1
Forum section: electronics / beginners

author: SpannersToSparks
author_rank: Regular Contributor
timestamp: April 28, 2018, 05:40:50 pm
content: HiI just bought a copy of Practical Electronics for Inventors, and it has a great practical section on FPGAs using the Elbert V2 and its dedicated software. I really want to get stuck into it but have hit a snag - I can't find any boards available outside the US or ebay, and they are vastly inflated in price. Sinelec Germany seem to have some but their site is broken and cart doesn't work.Is the board discontinued? If so does anyone know if there is a replacement for it that will use the Elbert Software? I know I could buy some other FPGA and use any one of a number of other software packages, but that's not why I bought the bookEdit: Looks like there are some in Slovakia and Portugal, may have to just suck up the postageIf anyone is looking for one, these guys were the cheapesthttp://www.botnroll.com/en/others/1786-elbert-v2-spartan-3a-fpga-development-board.html?search_query=Elbert+V2+-+Spartan+3A+FPGA+Development+Board&results=1shipping to UK

author: rstofer
author_rank: Super Contributor
timestamp: April 29, 2018, 12:04:46 am
content: One point made in the documentation attached to the product page is that this is a very small device. Try to implement the SD card and you quickly run out of logic. Not for the logic of the SD card itself but for the CPU to drive the logic.https://medium.com/adventures-in-electronics/meet-elbert-2141364011dcI don't know why Numato doesn't have a sales outlet in the UK, they have them in a lot of other countries. Maybe Germany is supposed to cover the EU.

author: ebastler
author_rank: Super Contributor
timestamp: April 29, 2018, 01:18:21 pm
content: I have ordered several boards directly from Numato. They ship via DHL, which has always been quick and reliable for me. Shipping costs are a bit painful unless you order 2 or 3 boards at once, however.They show the Elbert V2 as "out of stock" at the moment, but I have seen that before with this and other boards. It does not mean that they are discontinued.Alternatively, you might want to look at the Mimas V2, which is essentially a Spartan 6 version of the Elbert V2, and hence brings a significantly more powerful FPGA with similar peripherals. Personally, I like the original Mimas: The same Spartan 6 without much I/O periphery at all, but in a nice small form factor, with plenty of FGPA pins brought out to headers. Neat for integrating with your own piggy-back boards.
Is the ESR on the capacitor's datasheet? - Page 1
Forum section: electronics / beginners

author: Jay72
author_rank: Newbie
timestamp: August 25, 2025, 08:48:37 am
content: Hi All,I'm searching for an equivalent capacitor on the Mouser website and one of the parameters is ESR.I'm just wondering if the ESR value is on this pdf datasheet and I can't see or deduce it.I've added my Mouser search link fyi.https://mou.sr/3UHndcfThanks for your help and advice,Jay

author: NE666
author_rank: Frequent Contributor
timestamp: August 25, 2025, 09:00:05 am
content: It is, only it is given as the "Tangent of loss angle (tan δ)", from which you can derive the expected ESR at a given frequency.see:https://forum.digikey.com/t/calculating-capacitor-esr-from-tan/2633

author: Jay72
author_rank: Newbie
timestamp: August 25, 2025, 09:57:10 am
content: I'll study that.Thank you.

author: wraper
author_rank: Unknown
timestamp: August 25, 2025, 10:55:02 am
content: Quote from: NE666 on August 25, 2025, 09:00:05 amFor all low ESR series such as this one it's given in ohms. Nothing to calculate. In this particular datasheet it's called Impedance. Theoretically it's not exactly the same thing as ESR, however at such capacitance/test frequency combination, for practical reasons it's an exact match because capacitive reactance becomes a negligible part of impedance.

author: xvr
author_rank: Frequent Contributor
timestamp: August 25, 2025, 11:05:42 am
content: QuotePage 2, tableDimensions, columnImpedance（Ω）max.

author: Seekonk
author_rank: Super Contributor
timestamp: August 25, 2025, 01:06:16 pm
content: Many have not seen a clear example of ESR. This scope trace is of a capacitor bank being charged and then discharged at 10A. Note the instantaneous drop which represents the internal resistance. I read in some old Sencore literature that they had a patent on this method of ESR measurement.

author: tggzzz
author_rank: Super Contributor
timestamp: August 25, 2025, 01:53:51 pm
content: Sometimes the tan-delta specification is given because that is easily measured with a bridge. Tan-dela may be a useful characteristic when designing filters and linear PSUsMeasuring ESR in a way that is particularly useful for SMPS applications can conveniently be done using a simple square wave signal generator with a 50ohm output.Select the voltage and repetition frequency to show a trace similar to that is Seekonk's post. The initial current into the capacitor is then I=Vpp/50, and the ESR is the voltage step divided by I.Vpp can be offset to a voltage rail's DC value, which allows ESR (and C) as a function of Vdc to be determined.
Is the HP / Agilent DSO3062A Oscilloscope any good? - Page 1
Forum section: electronics / beginners

author: duggerd
author_rank: Contributor
timestamp: February 08, 2012, 02:14:55 am
content: I am a semi-beginner to electronics (first time using a non USB oscilloscope), and was wondering if this oscilloscope was any good.Is 60 MHz enough for basic electronics work?

author: slateraptor
author_rank: Frequent Contributor
timestamp: February 08, 2012, 10:06:01 am
content: Quote from: duggerd on February 08, 2012, 02:14:55 amYes and yes.

author: EEVblog
author_rank: Unknown
timestamp: February 08, 2012, 10:24:33 am
content: That's a rebadged Rigol 5000 series IIRC, which pre-dates the DS1052E by quite some time.An OK scope, but only 4KB of sample memory.You'd want to get it real cheap compared to the DS105E to make it worthwhile.Dave.

author: duggerd
author_rank: Contributor
timestamp: February 08, 2012, 01:01:21 pm
content: Quote from: EEVblog on February 08, 2012, 10:24:33 amThat would make perfect sense because the UI looks exactly like the Rigol.I will get the Rigol DS1052e then.

author: hhanoem
author_rank: Newbie
timestamp: February 19, 2014, 09:37:35 pm
content: Quote from: EEVblog on February 08, 2012, 10:24:33 amDoes someone have the schematics for the VDO-2072A?

author: Hydrawerk
author_rank: Super Contributor
timestamp: March 01, 2014, 01:23:29 am
content: What kind of ADCs does this Agilent DSO3062A have?? Are there also those overclocked or multiplexed ADCs? Like at Rigol DS1052E?

author: marshallh
author_rank: Unknown
timestamp: March 01, 2014, 01:56:55 am
content: Looks like the same arrangement of 5x60msps dual adcs overclocked to 100...

author: PioB
author_rank: Regular Contributor
timestamp: May 17, 2015, 02:30:25 pm
content: Can they be unlocked (frequency and features) like the newer dsoX2000/dsoX3000? I didn't find anything here on the forum. They were sold up to 200 MHz according tohttp://www.mhzelectronics.com/ebay/manuals/hp_dso3000-series_oscilloscope_datasheet.pdf.
Is the LdTrq input required in the Surface Mount PMSM block in Simulink 2020a ? - Page 1
Forum section: electronics / beginners

author: cadena
author_rank: Contributor
timestamp: April 15, 2020, 11:17:37 am
content: Hi everyone,I am trying to implement FOC algorithm in Simulink using the Motor Control Blockset. I want to simulate the iPower Gimbal Motor GBM2804H-100T with the Surface mount PMSM block. However, I don't understand what the LdTrq input is or how to set it up. SInce it is a motor I do not understand why a motor shaft input torque is required. Also if I am required to use this input, could I use a constant or would I need to do something else ? Please any help would be really appreciated.Surface Mount PMSM:https://www.mathworks.com/help/mcb/ref/surfacemountpmsm.html

author: Vovk_Z
author_rank: Super Contributor
timestamp: April 15, 2020, 07:35:35 pm
content: I'm very bad at it, but you can put there your load torque (so it will calculate speed).QuoteIt can be constant, or variable (if you want).
Is the power supply circuit diagram attached a bipolar output power supply? - Page 1
Forum section: electronics / beginners

author: axawire
author_rank: Contributor
timestamp: July 13, 2021, 05:46:29 pm
content: I have attached an image of the power supplies circuit diagram and I have wrote in what I think the polarity and approx voltage outputs would be. Can anyone confirm if I am correct or if I am incorrect and actually have a unipole output.Thanks.

author: dmills
author_rank: Super Contributor
timestamp: July 13, 2021, 06:38:13 pm
content: That's bipolar, referenced to the mid point ground.I make the output more like +-14kV however, assuming 120V primary, remember the mains voltage quoted is RMS, peak is sqrt(2) higher (And if sizing voltage ratings, you need to allow for mains being at +10% and maybe transformer regulation).Note that both load currents should be the same to avoid the transformer complaining.

author: TimFox
author_rank: Super Contributor
timestamp: July 13, 2021, 06:45:14 pm
content: That is a classic 'full-wave' voltage-doubler circuit. When you ground the secondary and mid-point of the capacitors, you obtain a bipolar supply. If you float the 'bottom' of the secondary and capacitor mid-point, and shift the ground point to the bottom of the capacitor string, you obtain a single-ended supply, but you have to worry about the insulation rating of the transformer.'Half-wave' voltage multipliers, such as the circuit attributed to Cockroft and Walton (although they were second to invent it) has the advantage of a grounded transformer for single-ended output, but the disadvantage of lower-frequency ripple that is harder to filter.
Is the SAE standard applicable for all EVs - Page 1
Forum section: electronics / beginners

author: Freshman
author_rank: Regular Contributor
timestamp: August 05, 2024, 07:44:54 am
content: https://en.wikipedia.org/wiki/SAE_J1772In the above link, is this standard applicable for 2-wheeler EVs or 4-wheeler EVs?It just mentions that the SAE J1772 is applicable for EVs in general. Doesn't mention 2-wheelers or 4-wheelers.Also, the Control pilot signalling is for 4-wheeler automobiles alone?

author: Siwastaja
author_rank: Super Contributor
timestamp: August 07, 2024, 09:12:46 am
content: Of course it is applicable to anything with any number of wheels, including a portable washing machine if manufacturers wants to build that.But in practice many cheap, low battery capacity e-scooters and such are instead equipped with the bog standard power plug of the country where they are sold, to be charged at home (and not with public EV charging infrastructure). Higher end motorcycles and such would of course use the SAE standard plug.
Is the TDS2CM Module Compatible with the Tektronix TDS1002 Oscilloscope? - Page 1
Forum section: electronics / beginners

author: nunolopez
author_rank: Newbie
timestamp: December 13, 2024, 03:54:20 am
content: I'm looking for insights regarding the TDS2CM module and whether it is fully compatible with the Tektronix TDS1002 oscilloscope. Some people say it works , while others say it doesnt. On the W140 website they state it is not compatiblehttps://w140.com/tekwiki/wiki/TDS2CMWhile the installation manual of the module says it's that it's compatible but the The electromagnetic (EMI) specifications are notguaranteed when the module is used in this model

author: TERRA Operative
author_rank: Super Contributor
timestamp: December 13, 2024, 04:48:02 am
content: If Tektronix say it's compatible, then I'd say it is, in fact, compatible.AFAIK, the TDS2CMA and TDS2CMAX which work on the TDS1000 scopes are functionally the same as the TDS2CM, just with better EMI shielding, so I don't see a reason why the TDS2CM won't work.The only functional incompatibility I am aware of is the TDS2MEM module not working with the TDS200 series scopes (which is a shame).I would try it, I think it would be fine. Let us know how you go and I'll update the Tekwiki page.

author: Muttley Snickers
author_rank: Unknown
timestamp: December 13, 2024, 06:14:25 am
content: I have a TDS1002 with a TDS2MEM Module and posted some information on these in another thread if it's any help.https://www.eevblog.com/forum/testgear/tektronix-tds2mem-scope-module-max-memory-size/

author: G0HZU
author_rank: Super Contributor
timestamp: December 13, 2024, 02:41:53 pm
content: I just checked my old Tek TDS2012 and it has the TDS2CM/TDS2CMA module fitted according to the UTILITY menu. I think it's the CMA version.I've only really used it for grabbing screenshots as per the image below using GPIB. Because of the limited resolution of the screen, the screenshots do look fairly grim compared to modern scopesI don't recall seeing any EMI shielding on the PCB in the module but maybe it's hidden on the other side of the circuit board.
Is the TPS610992 a good choice boost converter for very low uA current draw? - Page 1
Forum section: electronics / beginners

author: gus789
author_rank: Contributor
timestamp: March 22, 2018, 02:44:03 pm
content: Hi,I have a wearable project that consumes ~5uA static and peaks at ~1mA for about 40ms every second. I am currently powering it with a non-rechargeable CR1225 coin cell (3V) but would like to use something with a little more capacity and rechargeable. I was considering a 80mAh NiMH rechargeable button cell and boost it to ~2.5V. I was wondering if the TPS610992 ultra low Iq boost converter (which seems to total 1uA Iq accounting for the in and out pins) is a good choice for this. Most boost converters become very inefficient at such low current draws. Is the quiescent current the main culprit here? Thanks!http://www.ti.com/lit/ds/symlink/tps61099.pdf
Is there a chip that does this simple function? - Page 1
Forum section: electronics / beginners

author: Rick Law
author_rank: Super Contributor
timestamp: July 24, 2013, 11:08:07 pm
content: Folks, if you can again be generous with sharing your experience, I can use some help:I am looking for a chip that do this simple function, but I am having a hard time describing it in a way to Google successfully.I have a few (5) lines that only one can be ON at a time. It can be represents a number 0 to 5.(0=none,1=first line, 2=second line, 3=third line, 4=forth line,5= fifth line).Is there a chip that can take the 5 input and convert it to binary?So if the second line is on the chip outputs a 010; when the third input line is on output would be 011, forth would be 100, fifth would be 101. It would be ideal if the chip takes up to 7 lines and convert it to 3 bits from 0-7. If it takes 4 input, that would do since I can cascade it.This is a simple function that a few AND/NAND OR XOR can do. But this is such a simple function I suspect there may be a chip that does it already.Do you know of a chip that does this? And, is there one that does the reverse?Thanks,Rick

author: TerminalJack505
author_rank: Super Contributor
timestamp: July 24, 2013, 11:18:14 pm
content: It sounds like you are describing a "priority encoder." The 74HC147 and 74HC148 are examples.The opposite is called a decoder or demultiplexer. The 74HC238, for example.

author: Rick Law
author_rank: Super Contributor
timestamp: July 24, 2013, 11:31:55 pm
content: Quote from: TerminalJack505 on July 24, 2013, 11:18:14 pmThanks!I looked up the two you said and they do exactly what I am looking for.I was searching for "binary to digital" and I got more junk from Google than I could handle. Thanks for your help. Now I know what term to search for to find the one best fit my need.Rick

author: Stonent
author_rank: Super Contributor
timestamp: July 25, 2013, 12:01:39 am
content: I don't know a whole lot about 74xxx logic but what about a 74HC595? (I'm more-so asking people who know than the OP)

author: TerminalJack505
author_rank: Super Contributor
timestamp: July 25, 2013, 12:32:02 am
content: I don't know how you would get the functionality the OP wants from a shift register.The 74HC595 is a great part to have around though. They're the go-to part when you need to add more outputs to a microcontroller. You can control 8 or more outputs with just two or three microcontroller pins.
Is there a DC motor driver with Enable/Direction control pins? - Page 1
Forum section: electronics / beginners

author: LinuxHata
author_rank: Frequent Contributor
timestamp: October 04, 2023, 06:50:30 pm
content: Hello.I need to control a small (5V 0.1A max) DC motor with SIMPLE electronics. I do not want to use MCU, H-Bridge and so on.All I need is an IC, to which I connect the motor, and which has 2 input pins - ENABLE - which starts motor and DIR - say, if I apply "1" there, motor will turn clockwise, if apply "0" - counter clockwise. IC should handle dead time and all stuff like that by itself.Again, NO L293D or similar H-Bridge setups, I'm looking for single chip, complete solution.Thanks in advance.

author: pcprogrammer
author_rank: Super Contributor
timestamp: October 04, 2023, 06:59:51 pm
content: It is not completely what you are asking, but a MX1308 module can handle two motors for you.Seehttps://www.instructables.com/Tutorial-for-Dual-Channel-DC-Motor-Driver-Board-PW/The on/off and direction are not controlled by single pin signal change, as can be seen in the table on the website. I have bought these modules from Aliexpress and they are easy to use.

author: LinuxHata
author_rank: Frequent Contributor
timestamp: October 04, 2023, 07:14:40 pm
content: I'm looking for single IC, not the module.I do not need to drive 2 motors, I need to drive 1 motor.

author: langwadt
author_rank: Super Contributor
timestamp: October 04, 2023, 08:10:19 pm
content: Quote from: LinuxHata on October 04, 2023, 06:50:30 pmif you don't want a H-bridge then you are screwed, because that is what you will need.if absolutely must have dir and enable, MAX14870if you can live with two pins, one for forward and one for reverse L9110

author: Benta
author_rank: Super Contributor
timestamp: October 04, 2023, 08:15:50 pm
content: Check TI DRV8838. Should do the job.

author: LinuxHata
author_rank: Frequent Contributor
timestamp: October 04, 2023, 08:59:13 pm
content: Thanks, L9110 will be fine.
Is there a DC/DC controller with built-in boost circuitry for mosfet driving? - Page 1
Forum section: electronics / beginners

author: LinuxHata
author_rank: Frequent Contributor
timestamp: March 11, 2023, 06:36:21 pm
content: Hello.I'm making a flyback power supply, which delivers 50mA @ 200V from 5VDC supply.Currently I'm using DC/DC boost circuit to generate 12V from 5V, which is used to drive UC3843, which in turn, drives a beefy mosfet, which is directly hooked to 5V rail and everything works fine. However, I'd like to reduce count of parts, and skip DC/DC booster somehow. I tried to use a lower voltage PWM controller, like MCP1632. It works fine, but it's output is designed for driving logicl level mosfets, and it can't really handle my IXTQ82N25P mosfets.So the question is, maybe there is an low voltage (5VDC) PWM controller, which has built-in boost circuitry, so can drive big mosfets directly?

author: ogden
author_rank: Super Contributor
timestamp: March 11, 2023, 07:06:57 pm
content: I wonder why you use monster IXTQ82N25P for 10W power supply?Select MOSFET which is compatible with mentioned MCP1632 and consider it done.

author: LinuxHata
author_rank: Frequent Contributor
timestamp: March 11, 2023, 07:43:09 pm
content: I'm using it for two reasons1. Low RDSon2. Because I have a lot of them and paid around 50 cents for ea. (2nd hand ones from scrap electronics)Any LL mosfet with comparable RDSon will cost at least 10 times more.

author: Infraviolet
author_rank: Super Contributor
timestamp: March 11, 2023, 08:01:51 pm
content: Is the on resistance crucial in your application? The IX...'s 38mOhm resistance only loses you 1.9mV at 50mA, would losing a bit mroe to a higher resistance matter when you've got 200V of output?

author: LinuxHata
author_rank: Frequent Contributor
timestamp: March 11, 2023, 08:08:11 pm
content: You're calculating losses wrong. Much more current goes thru that transistor, not 50mA. Roughly saying, about 15W power at input is consumed, this is around 3A thru transistor.And I've not asked about "how to replace" transistor. I asked very specific question.

author: ogden
author_rank: Super Contributor
timestamp: March 11, 2023, 09:07:17 pm
content: Quote from: LinuxHata on March 11, 2023, 07:43:09 pm1. Low RDSon for 2A?2. No matter how cheap you got your mosfets - if they are more than 10x oversized and needs way more powerful driver, you better don't use them.

author: ifrythings
author_rank: Contributor
timestamp: March 12, 2023, 12:50:45 am
content: Have a look at the UCC2803/5 they turn on at 4.1v and have a 1amp drive, you probably still need a logic level mosfet though.
Is there a difference between these two Solid State Relays? - Page 1
Forum section: electronics / beginners

author: dog80
author_rank: Regular Contributor
timestamp: November 06, 2013, 10:17:17 am
content: Original relay:http://www.celduc-relais.com/all/pdfcelduc/scfl42100.pdfPossible replacement:https://www.relayspec.com/specs/005510/WG_280_D.pdfThese two look similar, but the original has an extra pin that is supposed to be connected to the neutral. What is the purpose of that pin? Can the other SSR be used in place of the original?EDIT: Fixed link

author: Rerouter
author_rank: Super Contributor
timestamp: November 06, 2013, 11:31:49 am
content: the original is a zero crossing style one, I'm going to assume it only switches when active = neutral, where the other one is essentially just a switch,

author: dog80
author_rank: Regular Contributor
timestamp: November 06, 2013, 11:53:11 am
content: I fixed the link for the second relay. It is too a zero crossing type but it doesn't have the Neutral connection
Is there a hex buffer in 74 series? - Page 1
Forum section: electronics / beginners

author: alank2
author_rank: Super Contributor
timestamp: November 04, 2015, 03:58:41 pm
content: Maybe this is a dumb question, but the equivalent of the 7404 but it does not invert? I was looking at the list of 7400 series at wikipedia and they show a 7407 but it says it has 30v open collector outputs on it. Is there something that is the same as the 7404 but does not invert? I would think that would be a basic ic, right?

author: dadler
author_rank: Unknown
timestamp: November 04, 2015, 04:03:06 pm
content: 74hc4050? Also 74hc367

author: dom0
author_rank: Super Contributor
timestamp: November 04, 2015, 04:09:33 pm
content: 74'373. Can also be used as a bus latch. (The important part istransparentlatch, which means it does not operate off a clock)

author: Ian.M
author_rank: Super Contributor
timestamp: November 04, 2015, 04:19:32 pm
content: 74ALS1034Hex non-inverting buffer with same pinout as an '04.

author: alank2
author_rank: Super Contributor
timestamp: November 04, 2015, 04:31:45 pm
content: Did people not need to buffer things? I am surprised there isn't a very basic numbered one that was made early in the 74 series numbering.

author: Ian.M
author_rank: Super Contributor
timestamp: November 04, 2015, 04:38:27 pm
content: Is original TTL74125early enough for you? However its only a quad and has individual tristate output control.

author: PA0PBZ
author_rank: Super Contributor
timestamp: November 04, 2015, 04:44:31 pm
content: 7407, open collector though.Never mind, should read first

author: sync
author_rank: Frequent Contributor
timestamp: November 04, 2015, 04:49:08 pm
content: When I done some TTL logic stuff in the past a buffer was seldom needed. You can use an AND, an OR or two inverting gates as non-inverting buffer. You often have spare gates available anyway.

author: dom0
author_rank: Super Contributor
timestamp: November 04, 2015, 04:53:55 pm
content: Quote from: sync on November 04, 2015, 04:49:08 pmAnd if you needed to buffer something, then it was probably a bus anyway. And there are tons of 8 bit buffers in 7400.

author: SeanB
author_rank: Super Contributor
timestamp: November 04, 2015, 04:55:14 pm
content: 74240 and 74244, octal bus drivers. 8 drivers and an enable. Bonus over regular TTL is the fan out is much higher, so they can drive long bus lines on a backplane with the terminated end still having a good TTL level signal. Bad is the pinout is not that good, there are later octal buffers which have a near straight through path.

author: alank2
author_rank: Super Contributor
timestamp: November 04, 2015, 05:07:21 pm
content: Quote from: Ian.M on November 04, 2015, 04:38:27 pmAbsolutely. I just wondered why something that seems like it would be a basic one wasn't available early in the numbering. A lot of good reasons here for that including the extra gates, etc. I guess they didn't want to spend time making a buffer when they were pumping out out more useful ones!

author: dacman
author_rank: Frequent Contributor
timestamp: November 04, 2015, 10:43:21 pm
content: Early 7400 ICs could drive 10 gates.
Is there a list of chip/part manufacturers and their logos? - Page 1
Forum section: electronics / beginners

author: XOIIO
author_rank: Super Contributor
timestamp: November 15, 2013, 04:10:54 am
content: Hey all something I've wondered for a long time, is there a list somewhere of a lot (or at leas the more common) chip and electronic part manufacturers and their logos? I've often seen an odd logo on a chip or other device and wanted to know who made it.

author: fluxcapacitor
author_rank: Frequent Contributor
timestamp: November 15, 2013, 04:41:28 am
content: Google search: "chip and electronic part manufacturers and their logos"http://freespace.virgin.net/matt.waite/resource/logos/index.htmhttp://www.dibsplace.com/design/ICLogos.htmhttp://www.advanced-tech.com/ic_logos/ic_logos.htmhttp://www.westfloridacomponents.com/manufacturer-logos.htmllots more if you do a search .

author: XOIIO
author_rank: Super Contributor
timestamp: November 15, 2013, 04:52:47 am
content: Quote from: fluxcapacitor on November 15, 2013, 04:41:28 amawesome, guess i never worded it right

author: Jope
author_rank: Regular Contributor
timestamp: November 17, 2013, 12:21:24 am
content: http://www.aufzu.de/semi/gif/
Is there a LM321 variant in SOT-23-5 package with OGPNV pinout? - Page 1
Forum section: electronics / beginners

author: dusan
author_rank: Regular Contributor
timestamp: September 16, 2024, 10:38:49 am
content: LM321 in SOT-23-5 package has PGNOV pinout (Positive input, Ground, Negative input, Output, Vcc). Is there a variant of LM321 with different OGPNV pinout (Output, Ground, Positive input, Negative input, Vcc)?

author: ggchab
author_rank: Frequent Contributor
timestamp: September 17, 2024, 09:09:56 am
content: LMV321 ? (https://www.ti.com/lit/ds/symlink/lmv321.pdf?ts=1726493809052)

author: dusan
author_rank: Regular Contributor
timestamp: September 17, 2024, 10:05:28 am
content: Quote from: ggchab on September 17, 2024, 09:09:56 amThat's also PGNOVCorrection, that datasheet shows PGNOV but there is other datasheet for LMV321AIDBVR which shows correct OGPNV:https://www.lcsc.com/datasheet/lcsc_datasheet_2304140030_Texas-Instruments-LMV321AIDBVR_C484730.pdfon page 4The important part is "A" and "DBV" suffix so LMV321AIDBVRHowever another catch is that it is only 6V, while original LM321 goes to 32V

author: Kleinstein
author_rank: Super Contributor
timestamp: September 17, 2024, 05:01:44 pm
content: If I interprete the sequence right the TS321 version should fit, at least some variants - there can be several from different manufacturers.For the old LM321 precision amplifier there is not SOT23 version at all, maybe a TO99.

author: dusan
author_rank: Regular Contributor
timestamp: September 17, 2024, 05:40:45 pm
content: Here is *TS321* state on lcsc:$0.12 - TS321G-AF5-R by Unisonic - correct OGPNV pinout but out of stock$0.18 - TS321ILT by ST - incorrect PGNOV pinout, 8000 in stockthe rest has prices comparable with OPA171 at which point it makes no sense to use them.https://www.lcsc.com/product-detail/Operational-Amplifier_UTC-Unisonic-Tech-TS321G-AF5-R_C5160419.htmlhttps://www.lcsc.com/product-detail/Operational-Amplifier_STMicroelectronics-TS321ILT_C38380.html
Is there a range of project boxes with recess for PCB top/front panels? - Page 1
Forum section: electronics / beginners

author: negativ3
author_rank: Regular Contributor
timestamp: March 17, 2023, 03:17:58 am
content: My reference is the uCurrent where the project box precisely fits a PCB top panel. Is there a range specifically suited for this? I am aware of the alu extrusions where end panels can be designed to suit but top-loading boxes of various sizes are what i'm after!ThanksAndy

author: austfox
author_rank: Regular Contributor
timestamp: March 17, 2023, 07:13:55 am
content: We call them 'jiffy' boxes in Australia, not sure in other countries. These are ABS plastic boxes that come with lids, and sold in our electronic stores such as Altronics and Jaycar. The 4 standoffs in each corner that the lid screws into are slighlty recessed, so a PCB if cut correctly can take the place of the lid and sit flush with the sides of the box.I've completed many projects using this method and the final product really does look professional.
Is there a uCurrent Gold document? - Page 1
Forum section: electronics / beginners

author: eyal
author_rank: Contributor
timestamp: May 18, 2015, 08:24:27 am
content: The later part of the original uCurrentArticle.pdf is about Testing which does not match the GOLD version. I could not find a later document (if there is one I would appreciate a link).It would be good to have an updated document of at least this "Testing" section and maybe the later specs/diagram which probably changed too.TIA

author: con-f-use
author_rank: Unknown
timestamp: May 18, 2015, 01:39:33 pm
content: Here is thenew material. Scroll down for Schematic, Bom and other files.

author: swgertsch
author_rank: Contributor
timestamp: May 15, 2016, 04:38:00 am
content: The link you gave points to an overview of the differences between the older version and the newer Gold version (v5).Yes, there are links to the new schematic, BOM, and mfg'ing data files, but the link still has a link that points to Dave's original detailed article about the old version (As published in the April 2009 issue of Silicon Chip Magazine).I believe we would like to see the article revised to reflect the new Gold version. The original article is well written and would serve as an excellent "official" User Guide for the product. It is a shame it has not been updated.
Is there a way to bulk copy/bulk insert a bunch of components into NI Multisim? - Page 1
Forum section: electronics / beginners

author: zdelarosa00
author_rank: Regular Contributor
timestamp: February 25, 2016, 12:33:07 am
content: Hi!, im using Multisim to implement a logic circuit... I have to have tens of gates for the design, so, is there a way to make 30 copies at a time or insert 40 copies of the same component...?.. Sorry if its not the right place... Greetings from Mexico!
Is there a way to check this SMPS transformer (schematic)? - Page 1
Forum section: electronics / beginners

author: ThermallyFrigid
author_rank: Frequent Contributor
timestamp: August 27, 2021, 11:38:10 pm
content: Hello,I am having a hard time determining whether this transformer is functioning properly or not.It is in a 300watt Modified Sine Wave Inverter and receives 12v as shown in the schematic below.Each pin on the transformer is numbered below. I'm not even sure which side is primary and which is secondary.I have attempted to apply 12v DC voltage to the transformer removed from the circuit and the results were confusing.I connected 12v + to pins 3 and 4 and 12v - to pins 5 and 6. What I got from pins 10 and 11 was AC 1v at varying frequency from 30Hz to 181HzThis is not what I was expecting. I was expecting an higher DC voltage output.When the VOM meter was set to DC I got absolutely nothing. No reading at all from pins 10 and 11.I also have a DE-5000 inductance meter.I got 3.376 mH across pins 10 and 1128.9uH between 5/6 and 3/428.9uH between 1/2 and 3/4116uH between 1/2 and 5/6Any insight or guidance appreciated. I'm somewhat lost.ThanksTransformerPins.jpgTransformerPins2.jpgAnd here is the schematic of it in circuit.....Transformer_Schematic_2021-08-27.jpg

author: bob91343
author_rank: Super Contributor
timestamp: August 28, 2021, 03:21:57 am
content: It isn't that simple. First, you don't connect dc to a transformer winding unless you are trying to burn it out or at least provide magnetic bias.This is not a simple circuit. Why do you suspect the transformer? The inductance and resistance readings are all that are necessary, assuming you either have a known good one or know the design parameters. Lacking that, there isn't much you can do.

author: ThermallyFrigid
author_rank: Frequent Contributor
timestamp: August 28, 2021, 07:30:58 pm
content: Quote from: bob91343 on August 28, 2021, 03:21:57 amThanks BobI was just hoping to rule it out as the problem.Can you please tell me how this transformer receives AC when it is connected only to DC?

author: ThermallyFrigid
author_rank: Frequent Contributor
timestamp: August 28, 2021, 07:53:56 pm
content: Is this the jist of it ?

author: bob91343
author_rank: Super Contributor
timestamp: August 28, 2021, 09:16:24 pm
content: What you have is an oscillator, a multivibrator. When it oscillates you get a square wave that is applied to the transformer after buffering by the FETs.

author: tubos
author_rank: Contributor
timestamp: August 29, 2021, 11:09:34 am
content: Hi, ThermallyFrigidWhat did you use to draw that circuit?

author: ThermallyFrigid
author_rank: Frequent Contributor
timestamp: August 30, 2021, 02:31:24 am
content: Hello,In which post number ?The OP or Reply #3 ?
is there a way to program this chip? - Page 1
Forum section: electronics / beginners

author: manubali
author_rank: Contributor
timestamp: December 03, 2018, 07:03:04 am
content: background: i do macbook repairs and this chip is programmed and is logicboard specific, and its apple's dedicated chip so we don't have any documentation for it, so we cannot buy it or program it.recently i was looking at atmel's at1284p data sheet and i found that few of its pins are same as at1284p, so i was wondering that is there a way i can read data from it using atmel's or some other kind of programmer.please check the attached photo for pinout information.

author: ataradov
author_rank: Super Contributor
timestamp: December 03, 2018, 07:16:07 am
content: What do you mean "the same"? ATmega1284p is not available in BGA package and this chip clearly is a BGA chip.And if you are talking about pin names like TDI, TDO, TCK, then there are thousands of chips with those pins, it is just a standard JTAG port.And if it is an Apple chip, you can rest assured there is no way to read it.And also SWDIO/SWCLK suggest that it is likely to be an ARM Cortex device. I would guess some NXP device.

author: manubali
author_rank: Contributor
timestamp: December 03, 2018, 07:22:26 am
content: Quote from: ataradov on December 03, 2018, 07:16:07 amthanks, i was hoping there maybe some way to get around it, but i guess there is none

author: mvs
author_rank: Frequent Contributor
timestamp: December 03, 2018, 03:10:38 pm
content: Quote from: manubali on December 03, 2018, 07:03:04 amLM4FSXAH5BB is LM4F Stellaris MCU from Texas Instruments in BGA157. It is customer specific IC, Stellaris docs and tools may apply for most functions, but not all.
Is there a way to tell if solder residue corrosive or not? - Page 1
Forum section: electronics / beginners

author: alexg
author_rank: Regular Contributor
timestamp: March 06, 2019, 06:29:41 pm
content: Hello, is there a way to tell by looking at soldering residue if it corrosive or not? I have few rolls of soldering wire that I absolutely love more than any other big brand names I tried, it flows fantastically, leaves very little residue, etc.https://www.amazon.com/massmall-Solder-Electrical-Solderding-0-0119inches/dp/B012CFLF4UHowever, there is no information what kind of flux does it have inside, clean, no clean, corrosive, non-corrosive. I currently do clean it with IPA but it is few extra steps that I would like to eliminate, the visual appearance of residue is not an issue but my question is, is there a way to tell if residue is corrosive without waiting few years to see? Are there any telltale signs that can tell if its corrosive or not?Thank you

author: tooki
author_rank: Super Contributor
timestamp: March 06, 2019, 06:43:09 pm
content: It says right on the product page you linked: "Product Name: Rosin Flux Core Solder"So I'll go out on a limb and say it's rosin flux.

author: helius
author_rank: Super Contributor
timestamp: March 06, 2019, 06:47:18 pm
content: The IPC standard tests for flux corrosivity are the copper mirror test and coupon tests. Copper mirrors are glass microscope slides which have been sputter coated with a thin copper film. The flux is applied to the mirror and then heated to its activation temperature, and the result is observed over several days for signs of corrosion (which will be visible as pinholes when light is viewed through the slide).The coupon tests are just squares of copper clad PCB which have been soldered with the solder and flux under test. They are placed in an environmental chamber under elevated heat and humidity for an accelerated age test. At 120 hours, the coupons are examined for signs of corrosion, specifically changes in color of the copper and the solder alloy.

author: Cnoob
author_rank: Regular Contributor
timestamp: March 06, 2019, 07:03:44 pm
content: On Amazon that solder is $7.99 for 65grams which is $61 for 500grams which is not cheap solderso it should good.I will stick to the Loctite Brand

author: schmitt trigger
author_rank: Super Contributor
timestamp: March 06, 2019, 07:15:18 pm
content: When one purchases items from any of the giant online retailers, one has to assume that due-diligence is part of the total cost when purchasing those items.That applies to almost everything...... I.e. a power supply rated for 50 watts, may only deliver those 50 watts within a very narrow input voltage range.This "feature" won't be listed, this forum and others are filled with stories of unsuspecting buyers where the device they purchased fails to meet a particular feature.Returning to the case of the solder, there are two clear paths to follow:-Perform the due diligence yourself by employing some test coupons, as suggested by Helius-Or assume that you should always clean the flux residue. And continue to do so.