hybridfree/eevblog-posts huggingface dataset:
Do "internal bias resistor" digital MOSFETs exist? - Page 1
Forum section: electronics / projects

author: 741
author_rank: Frequent Contributor
timestamp: September 06, 2021, 02:37:20 pm
content: Just got some ROHM DTC113ZCA, the D.S. describes this as a "Digital Transistor". It has 10k B,E and 1k from B to the 'base' pin.I'd like a small (SOT-23) MOSFET version (because of the low ON channel resistance but mainly because the internal pulldown means it cannot turn ON accidentally).The internal pull-down will not develop a dry joint or shake loose like an external pulldown could.It seems the term "digital FET" is taken to mean simply "Very low level gate drive requirements", like the obsolete FDG313N (this is not what I'm after).So far I have not found any MOSFETs with built in biasing.

author: tszaboo
author_rank: Super Contributor
timestamp: September 06, 2021, 02:53:02 pm
content: They typically have the driver IC built in, and call it power stages, drmos, or similar. Or if you go the other way, they just call it load switches.

author: David Hess
author_rank: Super Contributor
timestamp: September 06, 2021, 05:28:43 pm
content: Some load switches include a pull-down on their enable input so that is probably what you are looking for.

author: 741
author_rank: Frequent Contributor
timestamp: September 08, 2021, 07:35:01 am
content: Thank you - I'll try "Load switch" as a search term. Never seen that term before!

author: David Hess
author_rank: Super Contributor
timestamp: September 08, 2021, 05:41:17 pm
content: They also make "protected" power MOSFETs which include protection circuitry. This datasheet does not explicitly say it but it looks like the input has a 200 microamp pull-down current.

author: amyk
author_rank: Super Contributor
timestamp: September 09, 2021, 01:28:08 am
content: Another similar part:https://www.onsemi.com/products/discrete-power-modules/mosfets/ntzd3156c

author: 741
author_rank: Frequent Contributor
timestamp: September 09, 2021, 07:35:41 am
content: The OnSemi part is the type of thing I had in mindThese particular devices are shown as obsolete. Ideally it would be a 'PMOS only' or 'NMOS only' version. I'll look some more at OnSemi.PS: I was struck by OnSemi's prominent notice thatON Semiconductor"is now"onsemiArrived at after much thought I assume
Do Eht PHY's RMI traces going to the micro require controlled impedance? - Page 1
Forum section: electronics / projects

author: ricko_uk
author_rank: Super Contributor
timestamp: January 18, 2025, 02:28:54 am
content: Hi,first time I am using an Ethenet PHY IC and I am using this IC (link below).I am wondering if the MII/RMI traces going between such IC and the micro need to be controlled impedance (it does not mention anything on the datasheet)?If so, what impedance is recommended?When I Googled it, apparently the official IEEE reccomendation is 68 Ohm single-ended/100 Ohm differential impedance, while some IC manufacturers recommend 50 Ohms single-ended with 30 Ohms series termination.I do have the 30R series resistors (which later I can set to 0R if needed). What is a safe solution in terms of impedance value?https://ww1.microchip.com/downloads/aemDocuments/documents/OTH/ProductDocuments/DataSheets/DS_LAN8742_00001989A.pdfThank you

author: ataradov
author_rank: Super Contributor
timestamp: January 18, 2025, 03:31:11 am
content: RMII traces are typically short and it does not matter as much. I've never seen anyone mark them to be impedance controlled. I'd worry more about length matching. A lot of large MCU packages have stupid pinout for MII/RMII.Keep the serial resistors just in case.Also, all MII/RMII signals are single ended. What differential impedance do they mean?

author: ricko_uk
author_rank: Super Contributor
timestamp: January 18, 2025, 05:11:01 am
content: Thank you @AtaradovQuote from: ataradov on January 18, 2025, 03:31:11 amYes, I wondered too. No idea about that.Thank you
Do motorola still make transitors ? - Page 1
Forum section: electronics / projects

author: sagitis
author_rank: Newbie
timestamp: January 24, 2011, 04:15:29 pm
content: yeah I was repairing one of those ultrasonic cleaner and came across the Motorola transitors.I thought Motorola ceased to produce transistor stuff any more except from their uC.Anyway is there any database could tell us which chips Motorola are still making

author: Time
author_rank: Frequent Contributor
timestamp: January 24, 2011, 05:19:01 pm
content: http://en.wikipedia.org/wiki/Freescale_Semiconductor

author: jahonen
author_rank: Super Contributor
timestamp: January 24, 2011, 05:25:09 pm
content: I think that discrete Motorola semiconductors can be nowadays found atON Semiconductor.Regards,Janne

author: Zero999
author_rank: Super Contributor
timestamp: January 24, 2011, 05:57:54 pm
content: You don't have to use exactly the same parts, just hoose devices with: the same PCB pinout, similar or higher Hfe, the same or higher GBWP, voltage and current ratings.

author: Time
author_rank: Frequent Contributor
timestamp: January 24, 2011, 06:00:53 pm
content: ON and Freescale are the 2 semiconductor companies that started at Motorola. Freescale being the largest and most prominent as its consistently ranked as one of the largest producers for semiconductor products in the world.

author: sagitis
author_rank: Newbie
timestamp: January 26, 2011, 11:19:55 am
content: Quote from: Hero999 on January 24, 2011, 05:57:54 pmYeah I know that but I was thinking about that, but there are a lot of cheap transistors in china branded in Motorola. So I was thinking are they fake.....thanks for the wiki
Do moving coil cylinder indicators still exist? - Page 1
Forum section: electronics / projects

author: e100
author_rank: Frequent Contributor
timestamp: November 17, 2020, 03:13:09 am
content: I remember seeing these in things like consumer tape recorders from the 1970s where they would be used as a battery level indicator.Half of the cylinder was painted red in a diagonal fashion. As it rotated more of the red became visible and full scale was all red.

author: SilverSolder
author_rank: Super Contributor
timestamp: November 17, 2020, 03:37:05 am
content: It would probably be implemented graphically on a display these days...

author: e100
author_rank: Frequent Contributor
timestamp: November 17, 2020, 05:00:29 am
content: Quote from: SilverSolder on November 17, 2020, 03:37:05 amUnfortunately modern isn't always better. Options are pretty limited for a low power, high contrast color indicator for use in outdoor conditions.The latest sunlight readable color reflective LCD displays have poor contrast when the sun hides behind a cloud, and LED indicators have to be driven with lots of power to be visible in bright sunlight.

author: CatalinaWOW
author_rank: Super Contributor
timestamp: November 17, 2020, 05:57:20 am
content: I doubt if any cheapies like you describe are still being made. Might find some old stock somewhere.These guys can probably help if you really, really want it.http://www.jewellinstruments.com/meters-and-avionics/panel-meters/analog-meters-product-list/Another option would be to put a solid disk pointer on a more standard movement. Appropriately painted and masked it would look a lot like the ones you describe. Not very compact though.

author: mikerj
author_rank: Super Contributor
timestamp: November 17, 2020, 09:13:14 am
content: TheLascarpanel mount LCD meters might suit your needs but for some reason they are crazy expensive. I've needed a small, basic reflective LCD bargraph panel meter before and found pretty much nothing, ended up rolling my own with a 8x1 character display and a small micro. One of the tiny e-ink displays might work well here too.

author: Yansi
author_rank: Super Contributor
timestamp: November 17, 2020, 09:20:20 am
content: Quote from: e100 on November 17, 2020, 05:00:29 amI just don't see why an LCD wouldn't do well outdoors. It will be more than adequate and likely even consume less power than this cylinder thing.

author: SilverSolder
author_rank: Super Contributor
timestamp: November 17, 2020, 12:03:52 pm
content: I think the cylinder indicator looks cool and I like it - but you'd probably have to make your own... Maybe use a small stepper motor? At least that wouldn't use power just to hold the indicator in one position...
Do not buy IC LV8727 on Aliexpress without knowing which batch it is. - Page 1
Forum section: electronics / projects

author: rtek1000
author_rank: Contributor
timestamp: April 12, 2023, 10:04:39 pm
content: I received bad IC from these two stores, I didn't get my money back.IC code LV8727 8VN2Liheng Technology (HK) Limitedhttps://m.aliexpress.com/store/519839Shenzhen Chengbin Microelectronics Co Ltd Storehttps://m.aliexpress.com/store/1102214974Then I bought a 3-channel board assembled and it came working.

author: thm_w
author_rank: Super Contributor
timestamp: April 12, 2023, 11:05:47 pm
content: Here is the Chengbin link:https://www.aliexpress.us/item/3256804474800003.htmlIn the photo it looks like a recovered IC. Is that what you got?Good idea to use the assembled board I guess. Although I'd consider using another stepper driver if that is an option.
Do Series ICP Add Voltage Rating? - Page 1
Forum section: electronics / projects

author: biomurph
author_rank: Contributor
timestamp: February 28, 2023, 11:10:15 pm
content: I've come across this is schematics and working hardware.For example 4 of the 15019E in this data sheethttps://www.nteinc.com/specs/15000to15099/pdf/nte15005e.pdfif placed in series, would that be the equivalent of a 200V/0.25A part?As in Ohm's law, the voltage drops across each ICP, is what I'm guessing, but somehow it doesn't feel right.Does this work for fuses too?The device in service with this arrangement is running with ~2mS pulsed voltages over 125V.Is there a different theory that explains this?Cheers!
Do 'smart' daisy chainable switches exist? - Page 1
Forum section: electronics / projects

author: e100
author_rank: Frequent Contributor
timestamp: November 30, 2020, 02:24:37 am
content: As in like a string of WS2812 LEDs behaves except in reverse with a string of switches each passing its on/off status to the next in the chain which eventually ends up at the microcontroller digital input.I was trying to figure out how to read lots of switches without having a mess of wires and a multiplexer. Ideally there would just be 3 wires, power ground and data linking the switches in a chain/bus configuration.

author: Whales
author_rank: Super Contributor
timestamp: November 30, 2020, 02:53:52 am
content: Not that I'm aware of. As it is I find it very hard to find switches that are nice physically but don't cost amounts measured in hours of wages :|> a mess of wires and a multiplexerN.B. some multiplexers can be daisy-chained, eg I2C port expanders or even shift registers if wired in a certain way. That allows you to keep the chips near the switches and only have a few wires going back to the micro.

author: NiHaoMike
author_rank: Super Contributor
timestamp: November 30, 2020, 05:01:28 am
content: "1-Wire" bus can do it, albeit it's a slightly complex protocol. In some cases, the devices can be powered by the bus so there would only be the bus wire plus a ground.With a bit of lateral thinking, you could use WS2811s with switches connecting resistors to the LED outputs, then detect changes in the supply current drawn by the string depending on which positions are active. Might even be able to do some tricks with the PWM to generate different signals for the different switches.

author: e100
author_rank: Frequent Contributor
timestamp: November 30, 2020, 06:18:33 am
content: Quote from: NiHaoMike on November 30, 2020, 05:01:28 amAs in round robin style where you tell each chip to briefly switch on an output and if the current jumps in sympathy, then the switch associated with that output must be closed?I guess you could also do a tree like search to see if any switches are on by switching on banks of LEDs to narrow down the selection.
Do tank circuits have Johnson-Nyquist noise? - Page 1
Forum section: electronics / projects

author: jmw
author_rank: Frequent Contributor
timestamp: October 07, 2024, 06:35:33 pm
content: If I have a parallel L-C circuit with some finite Q, it could be modeled as has having a resistor R in parallel, where \$Q = R \sqrt{C/L}\$. This isn't a "real" physical resistor, so does a L-C circuit have Johnson-Nyquist noise that depends on the Q?

author: TimFox
author_rank: Super Contributor
timestamp: October 07, 2024, 07:30:10 pm
content: Yes, when the equivalent circuit has a resistor (series or parallel), that resistor looks like a noise-free resistance in series with Johnson noise voltage generator (or in parallel with a noise current generator) at that location in the circuit. One or the other, not both.For narrow frequency bands, you can lump all the circuit losses into one such resistor.You may need to use more than one resistor for wider band calculations, where the noise generators are statistically independent.This is how Spice calculates such circuits.Obviously, calculating the noise at the designated output of the circuit will have a frequency dependence from the tuned circuit.For wider frequency band, depending on how that resistance was calculated, the resistance itself may be frequency dependent.Decades ago, I faced exactly this situation with resonant sensor coils in MRI systems, where the bandwidth of the receiver system was narrow, centered on the sensor resonance, and the conductivity of the patient was an important part of the sensor Q.

author: Alex Nikitin
author_rank: Super Contributor
timestamp: October 07, 2024, 09:11:51 pm
content: Yes, and it gets complicated when the added losses are frequency and power dependent. One close to my heart example is a magnetic head in a tape recorder. The magnetic energy losses in the core are equivalent to the increase of the coil active part of the impedance (=resistive part). A coil in a magnetic playback head for a tape recorder can have DC resistance about 100-300 Ohm however if you measure the active part of the impedance at AC, it will increase with frequency and the speed of that increase will depend on the core material of the head. For a typical permalloy core the active part of the impedance can easily reach several kOhm at 10kHz. And that means an increased noise produced by the head (which is not a good thing, obviously, in a PB head). Below is the graph I've made some years ago, comparing losses v frequency for 6 PB heads with cores made from different materials.CheersAlex
Do these video balun connectors allow 75 Ohm signal to pass through LAN cable? - Page 1
Forum section: electronics / projects

author: rajhlinux
author_rank: Contributor
timestamp: August 21, 2022, 04:04:02 am
content: Hello,I bought these video balun connectors, assuming that it has passive ferrite cores for signal transforming (not sure if this is the correct term) from 75 Ohms signal to pass through 100-Ohm UTP LAN cabling:https://www.amazon.com/dp/B07TGGV69J?psc=1&ref=ppx_yo2ov_dt_b_product_detailsAfter I got them, I'm starting to think these are just simply connectors at 75 ohms with no passive components to do signal transforming as a video balun such as these:https://www.amazon.com/BeElion-5Pairs-Twisted-Transmitter-Transceiver/dp/B06WWB418D/ref=sr_1_43?crid=ZC291629Z679&keywords=video+balun&qid=1661053810&sprefix=video+balun+%2Caps%2C59&sr=8-43#customerReviewsQuestion is, the first link provided are simply BNC connectors with no ferrite core or passive components to act as a balun transformer?Going to test them anyhow. Right now I have a 75 Ohm cable directly connected to a 100 Ohm UTP LAN cable and there is signal noise as expected. I do not think the product from the 1st link will solve any issues for me. Using them for a CCTV camera system, where CCTV analog camera connects to DVR/NVR.Thanks.

author: jonpaul
author_rank: Super Contributor
timestamp: August 21, 2022, 04:12:24 am
content: check ohms on BNC and bal connector, then are they connected or isolatedProbably have a $0.10 Chinese toroid, may work for LAN but not for videoUse a real 75:110 Ohm "balun" for any serious jobJon

author: Terry Bites
author_rank: Super Contributor
timestamp: August 23, 2022, 11:29:11 am
content: With thse things you most definitely get what you pay for. If you cant measure at least a few mH from input to output then its not a balun.
Do we have a video capture software for Mechanic camera (DX-4K Mini)? - Page 1
Forum section: electronics / projects

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: April 11, 2023, 10:00:51 am
content: Hi,I have bought a yaxun ak31 microscope along a DX-4K Mini from Mechanic, The setup works great and I can use the HDMI cable attached to a monitor to see the footage, there is a USB C connector that I use to power the camera, But I wonder if there is a software in windows that can use that USB to capture video or images, I have bought it from a Chinese seller and I have no contact anymore, so do you know a work around or software?

author: barshatriplee
author_rank: Regular Contributor
timestamp: April 11, 2023, 02:12:48 pm
content: You can try AMCAP.

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: April 15, 2023, 08:46:02 am
content: Thanks for sharing, Do you have any links to get that?
Do we still need electrolytic capacitors (for basic decoupling)? - Page 1
Forum section: electronics / projects

author: TheUnnamedNewbie
author_rank: Super Contributor
timestamp: April 02, 2020, 12:54:07 pm
content: This might sound like a big of a strange question, but I have spent the last few days diving deep into the concepts of decoupling capacitors, with lots of simulations and modeling.It got me thinking - Most LDOs have pretty good output impedance up to a few tens of kHz. Past the few tens of kHz, you are already into the regime where big electrolytic caps (especially when combined with trace inductance) are past self-resonance.So that makes me wonder - are big electrolytics still useful? (I realize some other applications where you have high pulse-loads are a different matter entirely).Do you still use them? Are you sure there is still a point to using them?

author: Siwastaja
author_rank: Super Contributor
timestamp: April 02, 2020, 01:35:46 pm
content: Great for damping resonances and peaking whenever you need to use large values of low-ESR ceramic capacitance - such as input circuitry of most switching converters.Say, you have 100uF of ceramic capacitance - put a 470uF cheap elcap in parallel. Boom, 100% input overshoot reduced to a few %.

author: David Hess
author_rank: Super Contributor
timestamp: April 06, 2020, 02:50:23 am
content: Quote from: TheUnnamedNewbie on April 02, 2020, 12:54:07 pmJust because they are past self resonance doesn't mean they are not providing useful decoupling; their impedance is still low to usefully high frequencies.QuoteThey are hard to beat economically when bulk output capacitance is required. I only see them entirely replaced when long life and high temperature operation is required.
Do you believe in science. tesla vs human - Page 1
Forum section: electronics / projects

author: Arjan Emm
author_rank: Regular Contributor
timestamp: December 21, 2015, 05:16:53 pm
content: Ofcouse you know it's safe within a Faraday cage. there is skin effect. iron and coper conducts better as human tisue. What if you are faced with 750 kv tesla coil in a chainmail suit? You start to doubt it, but after a few strikes it really feels save. half way i ask for 10 kva to 25 kva and start sticking my head in. The second movy is another arjan in the same suit, same power levels, but it looks much nicer in the dark.First test. 10 kva. halfway is ask for 25kva.Next test. it's dark. same power levels different arjan. and looks much better in the dark.:And for the ones that know my earlier work. My 150kva coil killing it's self.:Alot of stress and fun today!

author: HackedFridgeMagnet
author_rank: Super Contributor
timestamp: December 21, 2015, 08:47:23 pm
content: Good found something to put on my Santa list.

author: Arjan Emm
author_rank: Regular Contributor
timestamp: December 22, 2015, 06:11:01 pm
content: I doubt Santa can supply. As simple as it looks, well it's not.. many safety features and nothing is off the shelf.

author: Fungus
author_rank: Super Contributor
timestamp: December 22, 2015, 07:36:42 pm
content: Quote from: Arjan Emm on December 21, 2015, 05:16:53 pmNot very spectacular, but probably quite expensive.Quote from: Arjan Emm on December 22, 2015, 06:11:01 pmI've built one of these:http://www.easternvoltageresearch.com/drsstc_microbrute.htmlIt's quite good for a home unit and Santa can definitely supply...

author: Arjan Emm
author_rank: Regular Contributor
timestamp: December 22, 2015, 08:16:47 pm
content: Not very spectacular, haha, mostly very time consuming.Feisty little buggers those microbrutes. Evr knows how to design those.

author: Fungus
author_rank: Super Contributor
timestamp: December 22, 2015, 09:15:45 pm
content: Quote from: Arjan Emm on December 22, 2015, 08:16:47 pmDid the secondary survive?Quote from: Arjan Emm on December 22, 2015, 08:16:47 pmVery noisy and sparky for their size.

author: Arjan Emm
author_rank: Regular Contributor
timestamp: December 22, 2015, 09:33:08 pm
content: No the secondairy was the ' only' damage together with the three 125A fuses. The coil needs a complete rewind of 2km of fresh 1.5^2. Too much carbonization underneath the impact zones.

author: Mechatrommer
author_rank: Super Contributor
timestamp: December 22, 2015, 10:07:02 pm
content: Quote from: Arjan Emm on December 22, 2015, 08:16:47 pmi dont mind time consuming if it has practical or profitable application...

author: Arjan Emm
author_rank: Regular Contributor
timestamp: December 22, 2015, 10:28:15 pm
content: Quote from: Mechatrommer on December 22, 2015, 10:07:02 pmYou missed fun. Profitable is also a possibility since people happily pay to be amused. So far this rather ridiculous hobby has paid for itself.By performing with smaller coils we were able to pay for the materials for the big coil. In the end losts of fun, great gigs and only some time invested.
Do you guys keep old design around as "IP core"? - Page 1
Forum section: electronics / projects

author: technix
author_rank: Super Contributor
timestamp: August 17, 2015, 02:47:49 pm
content: This is more of a general project management question: do you guys keep existing designs around as what is like "IP cores"? For example a USB to Serial adapter, a Li-ion charger/protection module, or a Li-ion to 5V/12V boost converters, so when needed a design can be put together quickly?Currently I have those existing "IP cores" stashed away as a ready-to-use sections of circuitry, and when a project calls for it I just copy it into the schematic as an entire module:* M131 DS3231 RTC module = DS3231, backup battery, optional interface for M156 for rechargeable backup battery* M134 ATmega32U4 microcontroller module (like Arduino Leonardo, no LEDs) = MCU, crystal, ICSP port, USB interface* M138 ATmega328P microcontroller module (like Arduino Uno, no USB to UART or LEDs) = MCU, crystal, ICSP port* M152 3.3V to 5V boost converter = controller, inductor, schottky* M153 3.3V to 12V boost converter = controller, inductor, synchronous MOSFETs* M156 Li-ion battery charger/protection module = TP4056 charge controller, DW01A protection circuit* M180 USB to Serial adapter module = CH340G chipset, crystal
Do you happen to have a schematic for the AD9834 board sold everywhere? - Page 1
Forum section: electronics / projects

author: Verdefluox
author_rank: Contributor
timestamp: July 22, 2025, 05:10:05 pm
content: Long story short, I ordered like two times it (one from Ebay and one from Amazon), and both got somehow lost during shipping (assuming that they were shipped in the first place..).However, I thought I might recreate it: I know that online there are quite a few schematics available, but I'm not sure if they are actually valid, hence I'd rather ask. If there is something that also happens to have the PCB layout and the BOM it would be wonderful. For instance, it's like the one attached.Last note: I would like it to be easily interfaced with an Arduino, if possible, because the signal generator would be part of a bigger circuit.Thanks in advance to everyone that can help me

author: MarkF
author_rank: Super Contributor
timestamp: July 22, 2025, 06:12:53 pm
content: I don't have a schematic for that particular board; but here is one for a similar board.And some extra reference material.Also, that a look atthe function generator I builtwith an AD9834 and a PIC18F2550.You will find the schematic, the filter design, and many scope captures of its output waveforms.It should be easy enough to replace the PIC with an Arduino.Also note my Reply #14 and Reply #15.I cautiously connected the AD9834 Sign-bit output to a PCI PWM pin to allow for extra capabilities without the need for extra hardware (i.e. a start trigger for a frequency sweep and a PWM output generated from the PIC).The output opamp will overheat into a 50 ohm load. If I were to remake the generator, I would probably go with the through-hole chip to better dissipate some heat.Note also that there will be jitter in the sign-bit output when generating a square wave from the AD9834.

author: SiliconWizard
author_rank: Super Contributor
timestamp: July 22, 2025, 06:58:19 pm
content: Those boards are pretty barebones around the DDS chip. Yes, they don't have a "proper" output stage for use as a general-purpose signal generator, so they can only drive relatively high-impedance loads.I have one with an AD9959 in a drawer, haven't tested it yet.Just looking at the photo, this board doesn't seem to have any output opamp at all. It just looks like it has a filter stage for each of the current outputs (IOUT / IOUTB) and the output of these filters are on the "Sine1" and "Sine2" SMA connector. It's worse than barebones. If you don't use an external amplifier with a differential input, you won't be able to drive much.Looking at my AD9959 board, it seems similar: no output opamps, just passive filters. So those boards can only drive high-impedance loads.Note that 5 V over 50 ohm is 100 mA, 1/2 W. You need a pretty beefy opamp with proper thermal measures.You could use something like the THS3001. Note that you'll need a dual supply to do things right, unless you don't care about the output signal being possibly negative and are only interested in the positive range.
Do you have an Etekcity ZAP 433 Mhz 10-BH9938U Outlet Switch? - Page 1
Forum section: electronics / projects

author: ledtester
author_rank: Super Contributor
timestamp: August 15, 2023, 03:14:27 pm
content: I have a couple of receiver modules but no remote. If you have a remote I'd like to get the code timing data so I can build my own remote from a 433 Mhz transmitter module.From what I can tell the ZAP modules were introduced around 2015. The button on the side is a programming switch which allows it to learn a code from a remote. I tried teaching it the code from a 433 MHz outlet switch remote made by another manufacturer but it didn't seem to work.This page describes how the timing data can be recorded from a 433 receiver module and a USB logic analyzer:https://www.hackster.io/chuygen/hacking-a-433mhz-rf-power-socket-3930d6The other wireless outlet switch system I have uses the following protocol:attention signal: 160us HIGH followed by 5340us LOWa "1" bit: 160us HIGH followed by 530us LOWa "0" bit: 530us HIGH followed by 160us LOWThe transmitted code is 24 bits and looks like this:Code:ON OFFSW 1: 0x4ee2f3 0x4ee2fbSW 2: 0x4ee2f5 0x4ee2fdSW 3: 0x4ee2f6 0x4ee2feSW 4: 0x4ee2f2 0x4ee2faSW 5: 0x4ee2f4 0x4ee2fcA 690us bit period seems to be fairly common but not universal among these kinds of systems.Anyway, if someone has a ZAP remote I would really appreciate getting the timing data for the codes.Thanks!PS. I wonder if the sticker on the module (the 0329-4) is related to the codes the unit responds to.
Do you identify these parts? - Page 1
Forum section: electronics / projects

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: July 09, 2017, 11:53:24 am
content: Hican you identify these parts? it seems they are op-amp, the markings on them are theseF005H, F024B, F017G

author: Niklas
author_rank: Frequent Contributor
timestamp: July 09, 2017, 11:58:11 am
content: Looks like TL022 and TL062 from JRC. The numbers on the first line, 022 and 062, indicates the type, the second line is production date/location etc.

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: July 09, 2017, 01:30:10 pm
content: Thanks
Do you identify this part? - Page 1
Forum section: electronics / projects

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: June 13, 2017, 10:02:03 am
content: Hi,I think this is a MOSFET or IGBT, what's the part number as the APT55M40 does not show any results.

author: grumpydoc
author_rank: Super Contributor
timestamp: June 13, 2017, 10:05:50 am
content: Quote from: ali_asadzadeh on June 13, 2017, 10:02:03 amNo but APT55M50 does (which is what is actually printed on the part, AFAICS) -http://pdf1.alldatasheet.com/datasheet-pdf/view/147490/ADPOW/APT55M50JFLL.html

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: June 13, 2017, 10:23:36 am
content: Thanks, I see it differently!

author: P90
author_rank: Frequent Contributor
timestamp: June 13, 2017, 10:38:51 am
content: salam az California: )

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: June 13, 2017, 10:58:31 am
content: QuoteSalam az shiraz

author: P90
author_rank: Frequent Contributor
timestamp: June 13, 2017, 11:08:20 am
content: Quote from: ali_asadzadeh on June 13, 2017, 10:58:31 ammoafagh basheen hamvaten aziz.
Do you know a chinses manufacturer for these DC motors - Page 1
Forum section: electronics / projects

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: July 22, 2023, 12:50:45 pm
content: Hi,I want to buy these tiny DC motors with Right angle shaft and encoder, do you know a chines manufacturer or supplier for them?

author: Marco
author_rank: Super Contributor
timestamp: July 22, 2023, 03:25:39 pm
content: Google suggestsChangzhou Vic-Tech Motor Technology Co., Ltdthough I have no idea if that's an actual manufacturer or just an intermediary.

author: Doctorandus_P
author_rank: Super Contributor
timestamp: July 23, 2023, 08:57:39 am
content: Chinses ? Is that Chinglish?The motor is generally known as an "N20" form factor / size.https://www.aliexpress.com/w/wholesale-N20.htmlAlso, if you search on alibaba instead of aliexpress, you'll find manufacturers and/or distributors oriented to the industrial market.And there are more such sites. Have a go at:https://www.made-in-china.com
Do you know about any DIN mount TVS/SASD surge protestion for reasonable price?  - Page 1
Forum section: electronics / projects

author: Miyuki
author_rank: Frequent Contributor
timestamp: December 08, 2018, 07:32:13 pm
content: Hi folksI want to ask if someone know about DIN mount surge protection with big TVS/SASD (like 5-10kA pulse) for reasonable priceTo use on mains AC 240VI have big surge protection for direct lightning strike, but want some extra protection with low peak voltage only TVS diodes can provide
Do you know any part number or manufacturer for this part? - Page 1
Forum section: electronics / projects

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: January 17, 2023, 08:32:29 am
content: Hi,Do you know any manufacturer or part number or LCSC link that would sell this housing for Temp and humidity sensors?

author: bidrohini
author_rank: Regular Contributor
timestamp: January 18, 2023, 07:24:03 am
content: Not sure. You can contact Hengko.https://www.hengko.com/sht-10-mesh-protected-weather-proof-temperaturehumidity-sensor-includes-a-sintered-metal-mesh-encasing-products/

author: timeandfrequency
author_rank: Frequent Contributor
timestamp: January 18, 2023, 10:10:25 am
content: Hi ali_asadzadeh,As @bidrohini spotted the brand, it seems thatHengko from Shenzhen Cityis a major manufacturer for that kind of stuff. Could not really find another one.Available indifferent shapes and sizes.I guess the stainless steel strain relief is a vanilla part which is fairly easy to procure. Both threads must match in size and pitch.So let's say you choose the housing ref. HK66MEN from Hengko with a M12*1.5 female thread, some suitable SS 303 strain reliefs would be among those :CD12MA-SS CD12MA-SV CD12MR-SS CD12MR-SV.You may also need to buy the nut to keep a certain standoff between both parts.This onealso includes the Sensirion sensor.

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: January 18, 2023, 06:40:58 pm
content: Thanks Guys for great feedback
Do you know anything what can execute test vectors for GAL/ATF SPLD? - Page 1
Forum section: electronics / projects

author: c64
author_rank: Frequent Contributor
timestamp: September 09, 2021, 04:56:54 am
content: I use ATF16V8 / ATF22V10 sometimes. I know TL866II Plus can program them, and also few open source projects do, but I don't know anything what can run test vectors.Low cost (same price as TL866II or less)
Do you know good simulators for linux? - Page 1
Forum section: electronics / projects

author: 0cool
author_rank: Newbie
timestamp: November 07, 2017, 05:21:47 pm
content: Hello!I have several days trying to find a electronic simulator that run on linux mint.I had find some interesting simulators like oregano, KSimus Circuit Simulator, KTechlab, etc. But i want you recommendations about which simulator i should chose for lineal circuits.I have a couple of months into the linux world and i would like that you help me to find a good simulator.*If you see some mistakes on the previous texts please sorry me, the inglish isn't my maternal language.Thank you!

author: Floyo
author_rank: Regular Contributor
timestamp: November 07, 2017, 05:29:01 pm
content: I think Ltspice runs on Wine quite well, so you could give that a go. Benefit is that LTspice has a decent community behind it, and its a good sim for the price of free

author: 0cool
author_rank: Newbie
timestamp: November 07, 2017, 05:45:23 pm
content: Quote from: Floyo on November 07, 2017, 05:29:01 pmThank you for answering.LTspice is a good option, but it's freeware, i would like to have a open source simulator but i can't find a good one. However if there aren't good open source option i will have to use LTspice.

author: Cerebus
author_rank: Super Contributor
timestamp: November 07, 2017, 05:52:29 pm
content: QUCS

author: bd139
author_rank: Super Contributor
timestamp: November 08, 2017, 12:53:21 pm
content: KiCad can be used with ngspice:http://mithatkonar.com/wiki/doku.php/kicad/kicad_spice_quick_guide

author: 0cool
author_rank: Newbie
timestamp: November 08, 2017, 01:43:31 pm
content: Thanks Cerebus and bd139 for answering.I think that both are good options, i'll test both.

author: jmelson
author_rank: Super Contributor
timestamp: November 08, 2017, 11:15:42 pm
content: Quote from: 0cool on November 07, 2017, 05:21:47 pmWell, you could go to the grand-daddy : SPICE, which is still the base code for everybody else's commercial package.https://bwrcs.eecs.berkeley.edu/Classes/IcBook/SPICE/Strangely, this doesn't show up in the packages list for Ubuntu, although they have gwave, which is a waveform viewer.Also see :http://ngspice.sourceforge.net/spices.htmlJon
Do you know of a part like this?  Double sided socket for 0.025" square post... - Page 1
Forum section: electronics / projects

author: alank2
author_rank: Super Contributor
timestamp: October 19, 2014, 07:54:41 pm
content: Hi,What I'd like is one of these with the socket on both sides. Does anyone make such a thing?I could probably make some by cutting two of these apart and soldering them together with a pin, etc., but I'd like to find a part that is like this to begin with if possible...Thanks,Alan

author: T3sl4co1l
author_rank: Super Contributor
timestamp: October 19, 2014, 09:06:41 pm
content: So, a gender changer? Could tack a pair of PCB mounted sockets together back to back? (Mind the pinout doesn't get mirrored in the process!).The connector-oriented solution would be a wire-to-wire style connector with not much length, but still made out of wires. Such things are going to tend to be custom made though. No idea if you'll be able to find one off the shelf for whatever type housings you need it for.Assuming it's for a housing of pins type connector, anyway... you didn't say.. do you really need just a single pin? It might exist, dunno...Tim
Do you know of anyone hardware hacking webcams, sports cams or dashcam's? - Page 1
Forum section: electronics / projects

author: jonovid
author_rank: Super Contributor
timestamp: July 12, 2017, 04:45:42 pm
content: by hacking or mod'ing hardware. I mean the digital video side of things. not just an audio or lens mod.can any one help? Im looking for a mod or hack schematics for car dashcam's / sports cams & webcams.has any one mod'ed a dashcam? HD CCD sensor's by adding an analog video output for an in car video monitor.. or adding a second image sensor of the same type.? split screen dashcam or 3D dashcam, 2 image sensors.a two headed split video cam DVR mod?lots of DVR sports cam audio mic mods out there. as tapping in to the analog side of the audio is easy!but their is a lack of video dvr mod's! dashcam or sports cam mod's.I am looking for electronics schematics of hacked dash cams , sports cams & webcams.has any one mod'ed a webcam so two image sensors will split their computer screen monitor?into two so that they can view two video image sensors side-by-side. a 3D type hack?a split screen webcamI have looked at many YT videos of webcam mod's, most are just lens mod's.I know of software that can have more then one webcam at a time. this is not the idea here.I am looking for a hardware solution for the mod. so software can handle a single USB video feed.do you know of anyone hardware hacking webcams or dashcams?by tapping the HD image sensor adding using digital buffer ic's and a 2nd driver chip?i am interested in copying or trying this for my self. if an electronics engineer has successfully completed this type of mod.I have some cheap webcams & dashcam's to try it my self. all I need is a good schematic circuit diagram of a engineers mod.I have looked athttp://hackaday.com/category/video-hacks/but nothing

author: jonovid
author_rank: Super Contributor
timestamp: July 13, 2017, 01:51:07 am
content: Quote from: evb149 on July 12, 2017, 05:07:29 pmThank you for your input, its a lot harder than I had anticipatedmy goal is to see a3D videousb type video microscope out there. even if someone else achieves this task.with acommon high definition video feedthat can be sent to the monitor. or letterbox video for virtual reality 3D goggles.acommon video feedmakes a 3D video backwards compatible with 2D video software apps. youtube posting esc.hope someone makes this a reality
Do you know of smt plugs, so you can put the wire through from the bottom? - Page 1
Forum section: electronics / projects

author: Etna.
author_rank: Newbie
timestamp: May 19, 2025, 06:33:14 pm
content: Hi, there!I have a hard time finding plugs that I can plug in through the pcb from behind. They should be smt ones, as I also plan to use them on aluminium backed pcbs like in the examples shown. Some sort of collar to insulate the plug from the aluminium layer would be neat.Thanks in advance!Regards,Etna.

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: May 19, 2025, 06:53:07 pm
content: https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=1-1773719-1_INVERTED_BROCHURE&DocType=DS&DocLang=ENhttps://www.digikey.co.uk/en/products/detail/te-connectivity-amp-connectors/2213189-1/4486420?s=N4IgTCBcDa5gjAZngDgJwFp4gLoF8gthere are probably some Chinese clones out there if you can find them

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: May 19, 2025, 06:56:04 pm
content: https://www.kyocera-avx.com/products/connectors/wire-to-board/inverted-thru-board-18-26-awg-00-9296/

author: Smokey
author_rank: Super Contributor
timestamp: May 19, 2025, 09:42:11 pm
content: This is really cool. I didn't know this existed. Thanks everyone!

author: Etna.
author_rank: Newbie
timestamp: May 21, 2025, 08:19:36 pm
content: Thanks you so much!Those are great suggestions. I found other great choices while browsing through "Solid State Lighting Connector Assemblies" on Digikey to connect some wires on that pcb. Do you have by chance other suggestions to allow board to board connection "from behind" or "from the bottom" that is sleeved? There are thousands that allow that but none seem to insulate those pins like the left shown one. I just want to put the power supply on top of my light and not 90 degrees upright. That would be awesome!Regards,Etna.
Do you know this "YS" or "SY" Taiwan Manufacturer Logo? See Picture - Page 1
Forum section: electronics / projects

author: t1d
author_rank: Super Contributor
timestamp: March 03, 2021, 02:44:13 pm
content: I'm searching to find out who is the manufacturer of this variac coil, inside a BK Precision 1655A AC Power Supply. Google isn't getting the job done. Thanks for your help.

author: DC1MC
author_rank: Super Contributor
timestamp: March 03, 2021, 02:47:41 pm
content: http://www.ystech.com.tw/ysfan/index.php

author: t1d
author_rank: Super Contributor
timestamp: March 03, 2021, 03:29:30 pm
content: Quote from: DC1MC on March 03, 2021, 02:47:41 pmThank you for your reply. Their product line only shows fans. Do you have some specific reason to know that this logo is for this company?

author: DC1MC
author_rank: Super Contributor
timestamp: March 03, 2021, 06:49:25 pm
content: Quote from: t1d on March 03, 2021, 03:29:30 pmWas showing up in a search "Taiwan variac slidac 110v 0-130V 2.5A", if I was misleading you I apologize, I've also seen some similar models on Ali, bit most seem to be for 120V.DC1MC
Do you know where can I find the other end of this connector - Page 1
Forum section: electronics / projects

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: June 01, 2020, 08:23:45 am
content: Hi,I do not know where they hide it in LCSC, do you know where I can find the other end of this connector that should be soldered inside PCB in LCSC?

author: Messtechniker
author_rank: Frequent Contributor
timestamp: June 01, 2020, 08:26:44 am
content: Search for "spade terminals pcb"

author: rdl
author_rank: Super Contributor
timestamp: June 01, 2020, 08:32:02 am
content: Male Quick DisconnectTwo sizes are most common 0.187" and 0.250"

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: June 01, 2020, 08:52:23 am
content: QuoteThanks, But there is no results in lcsc, do you have any link in there?

author: Vovk_Z
author_rank: Super Contributor
timestamp: June 01, 2020, 01:21:40 pm
content: Faston 6.3 mm?

author: JackJones
author_rank: Regular Contributor
timestamp: June 01, 2020, 01:33:46 pm
content: https://lcsc.com/products/Terminals_11070.htmlFilter by "quick connect terminal" in the product type.

author: phil from seattle
author_rank: Super Contributor
timestamp: June 01, 2020, 04:29:58 pm
content: It's a "250" connector. they are all over the place. Essentially a .25" spade connector. Google the part number KET-ST730269-3 for lots of hits. By the way, in the future, please include the LCSC number or a link to the datasheet - saves us all some googling around.

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: June 02, 2020, 06:01:11 am
content: Thanks for the help.This is the cheapest one,https://lcsc.com/product-detail/Terminals_Xucheng-Elec-EST026_C52878.htmlIt seems LCSC has only a few of these items from manufacturers,it's weird though!I wonder what's the current rating,There is no info inside the datasheet, I need something to be able to handle 40A.
Do you Recognise these parts - Page 1
Forum section: electronics / projects

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: January 09, 2021, 04:42:53 pm
content: Hi,There are a few parts that I can not recognize all the active parts except the LM258, this board is a 4-20ma transmitter from a Delta DT320 temperature controller,do you recognize the parts? do you have any Idea about the circuit?

author: DC1MC
author_rank: Super Contributor
timestamp: January 09, 2021, 05:01:08 pm
content: LNW (64) -2N7002BKNXP N-Channel MOSFEThttp://www.s-manuals.com/pdf/datasheet/2/n/2n7002bk_nxp.pdfC8RT9193-30PQVRichtek LDO regulatorhttp://www.s-manuals.com/pdf/datasheet/r/t/rt9193_richtek.pdf

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: January 10, 2021, 10:13:05 am
content: Thanks, there are two missing parts then

author: DC1MC
author_rank: Super Contributor
timestamp: January 10, 2021, 12:35:51 pm
content: Quote from: ali_asadzadeh on January 10, 2021, 10:13:05 amI see that you have a number of posts here, so you know that:a) A picture for identifying components should be made focused and directly from the top, because the parts in background are not easy to see.b) There is no need for saying thanks, there is a special link for it on top of the post.This being said:D4RT9198-27 Richtek LDO regulatorhttp://www.s-manuals.com/pdf/datasheet/r/t/rt9198%2C_rt9198a_richtek.pdfC 10.568-(seems to be)Mems oscillator 10.568MHz in SOT23-5 package, there are really a gadzillion of them, either get one that fits the pins or spend time searching for the right one by getting ca 30-40 datasheets and then seeing the SMD markings with C, not something that interesting or challenging. Either this or a reference voltage, you need to draw the schematic to be sure, then the purpose will be immediately visible.Cheers,DC1MC

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: January 11, 2021, 08:14:39 am
content: QuoteI do not think this is an oscillator , I think it should be a DAC maybe, because this is a 4-20ma current transmitter,QuoteThis one also makes no sense, because we have another LDO already
What connectors are these? - Page 1
Forum section: electronics / projects

author: ricko_uk
author_rank: Super Contributor
timestamp: April 04, 2023, 12:27:11 am
content: Hi,I am trying to find out the model and manufacturer of these two connectors. I tried all the distributors by searching for circular connectors and other searches but couldn't find them. Does anybody know?Thank you

author: amyk
author_rank: Super Contributor
timestamp: April 06, 2023, 12:36:31 am
content: By "diameter" do you mean outside or inside? What about the pins?Any more clues you can give us, such as the country of origin of the equipment?

author: ricko_uk
author_rank: Super Contributor
timestamp: April 07, 2023, 12:14:47 am
content: Thank you Amyk,by diameter I mean the OD of the barrels of the connectors, the part that has the male contact pins.The equipment is from china and is a electrolysis machine but that's all I know.I looked on all far-east distributors and all the European and US ones, but couldn't find any. Any suggestions would be great.Thank you