hybridfree/eevblog-posts huggingface dataset:
Regarding Hantek DSO3064 purchase from Europe - Page 1
Forum section: electronics / projects

author: beauty2003tt
author_rank: Contributor
timestamp: January 28, 2016, 07:22:49 am
content: Hello,I'm about to buy DSO3064 from Germany through Ebay but all the units DSO3064 in Europe look a little bit different than the one showed on Hantek's website.The most noticeable difference is the case with which they are coming in.On the website is showed aluminium case and in Europe they come in plastic case.Could anyone tell me if it is normal this difference or all units in Europe are fake?Thanks a lot.
Regarding ISO 7816 Altium Library - Page 1
Forum section: electronics / projects

author: rajbuddy
author_rank: Contributor
timestamp: September 19, 2022, 10:00:22 am
content: Hello guys,can I get an altium library for Smart card ISO 7816 as I am not able to find it?Thanks,Raj

author: johnboxall
author_rank: Unknown
timestamp: September 19, 2022, 10:59:30 am
content: Make it yourself orhttps://www.snapeda.com/instapart/
Regarding RCA solid state power circuits design handbook Book - Page 1
Forum section: electronics / projects

author: Gurumurthy
author_rank: Regular Contributor
timestamp: June 06, 2017, 05:17:19 pm
content: Dear all,,I am in need of RCA solid state power circuits design handbook Book.Please Help me in this regard.

author: KMoffett
author_rank: Regular Contributor
timestamp: June 06, 2017, 08:29:16 pm
content: Google: RCA solid state power circuits design handbookYou'll get things like this:https://www.amazon.com/RCA-Solid-State-Power-Circuits-Designers/dp/B000I76D3IAnd more.Ken

author: danadak
author_rank: Super Contributor
timestamp: June 07, 2017, 10:08:10 am
content: Get it for free -https://archive.org/details/rcasolidstatepow00rcacRegards, Dana.

author: Gurumurthy
author_rank: Regular Contributor
timestamp: June 08, 2017, 05:59:45 pm
content: Sir,It is not viewable. Please give a document form which is viewable like doc or pdf format..

author: SeanB
author_rank: Super Contributor
timestamp: June 08, 2017, 07:18:21 pm
content: https://archive.org/download/rcasolidstatepow00rcacGives you all the options, from a few ebook types to a PDF.

author: Gurumurthy
author_rank: Regular Contributor
timestamp: June 09, 2017, 04:32:55 am
content: Dear Sean B,Sorry, those links are not working
Regarding the Foot Print Designing for Microcntroller based on Wire Bonding Tech - Page 1
Forum section: electronics / projects

author: Anirudh_THABJUL
author_rank: Newbie
timestamp: May 29, 2015, 09:02:08 pm
content: Hiee everyone,I am a Hardware Engineer and also a PCB designer.I am using a Microntroller which is inCHIP PACKAGE.So in order to connect our microcontroller with my PCB, i am usingWIRE BONDING TECHNOLOGY.So, Can any one suggustQ1. which type of wire bonding is the best among this **Ball Bonding, Wedge Bonding, Compliant Bonding** technique's?> SPECIFICATIONS:> I. Size of Microntroller - 3.6mm X 3.6mm> II. Thickness Of Microcontroller - 200um> III. Low Power ApplicationQ2. How to design foot print for PCB designing according to choosen wire bonding technology ?Can any suggust a better Websites or Pdf Link's etc.. about wire bonding technology?.Regards,Anirudh THABJUL**Lansa Diffusion**, Paris, France
register map for SiI9687A - Page 1
Forum section: electronics / projects

author: NiHaoMike
author_rank: Super Contributor
timestamp: July 03, 2018, 05:02:36 am
content: I got a cheap PiP HDMI switch that I want to turn into a KVM box of sorts. The idea is that I'll add some USB microcontrollers to handle the input device emulation and communication with the master machine, one port on the HDMI switch reserved for the master machine. The end goal is to have a desktop app that works a little like VM windows, except they will actually be interfacing to other physical machines. The app will send its screen coordinates of each window to the switch and it takes care of doing the overlay.Is there a register map or any other info (e.g. library code) that can help get a head start for figuring out how to control the SiI9687A? I did find the hardware datasheet which has a little of what I2C address ranges do what.
Regulate higher voltage for mcu and tracking pre-regulator - Page 1
Forum section: electronics / projects

author: MarkusAnd
author_rank: Contributor
timestamp: September 05, 2021, 02:06:23 pm
content: I am currently designing a lab bench power supply using the LT3080. The design is inspirated from Daves PSU-design series.It will have an input of 18V and an output of 0-15V and 1A. I am going to use an Atmega328 to control the limits and a display. For that I of course need 5V and I am using a LM2576 to drop 18V to 8V and then using a LM7805 to get a steady 5V output. I also want to add a tracking pre-regulator to the LT3080 which will keep the input about 1V above the output.Now the question is, how could I generate both the 5V and the voltage for the tracking pre-regulator while keeping the part-count low? Is there a good dual-output switcher that covers my voltages and currents, or is it better to use two individual switchers? Or is there even a better way than switchers?I will use an ac-dc wall adapter to get the 18V DC input.

author: Marco
author_rank: Super Contributor
timestamp: September 05, 2021, 03:14:39 pm
content: In theory there are single inductor multiple output buck converters and in theory you could use the atmega as the switching controller ... but just throw on two high voltage buck converters and save yourself the headache.
Regulated automotive PSU (6-15v -> 12v 5A, 5v, etc) - Page 1
Forum section: electronics / projects

author: sparx
author_rank: Contributor
timestamp: September 13, 2014, 11:44:02 pm
content: Just a quick question - I want to (at some point!) - install a PC into my car to take over music, sat nav, etc. I had a crude install in my previous car of a windows xp based tablet running from a 5v 5A regulated buck converter, but it suffered drop out at engine turn-over.I have found some buck/boost converters (eBaycapable of 2A supply, with 6-33v input, however was wondering if there is another, better way, to get regulated 12V from 6-15v. Could I put 2-3 of these in parallel? What if one failed? This supply would run a computer system of some description and also an lcd screen.Once I can get this one supply sorted, the rest of the system can be sorted with regards to switching on with ignition/timing out after ignition is off to prevent drainage, etc.Cheers!

author: urlkrueger
author_rank: Contributor
timestamp: September 14, 2014, 10:50:48 pm
content: Starting a car requires a lot of current from the battery which, due to internal resistance in the battery, causes the voltage to drop too low resulting in the computer shutting down. The answer to your problem is to keep the voltage up at the computer.One way to do this would be to power the computer from an additional small 12V rechargeable battery. Perhaps a UPS unit could come into play here. Then with a battery isolator, essentially a large diode, you could connect this up to your automotive system in order to keep the small battery charged.

author: UnaClocker
author_rank: Contributor
timestamp: September 15, 2014, 02:18:24 am
content: Automotive ECM's run at 5v (well, most, they may have finally come out with some at 3.3v). It's not an insurmountable task to get 5v while cranking. Were you using something like a 7805? There's a low dropout version which has been used with great success in automotive applications. If you're using a switchmode power supply, just read the datasheets on the chips to determine how low it can go. You want down to at least 7.5v, 6.5 is even better. Seems like the mc34151 is good down to 6v if I remember right.
Regulating AC to the same rms DC voltage - Page 1
Forum section: electronics / projects

author: TMM
author_rank: Frequent Contributor
timestamp: May 02, 2013, 05:57:38 am
content: Hey guys, i'm currently modding a speaker amplifier and I am replacing the preamp with my own design. There are two 18V outputs from the main transformer dedicated to the preamp and the schematic shows the following for the original preamp powersupply:I don't quite understand what they were trying to achieve with the 7818/7918 regulators. Would they not be running below the dropout voltage all the time? I measured the taps of the transformer and they are indeed 18.5Vrms unloaded. The only thing i can think of is that it might prevent voltage spikes.

author: Dave
author_rank: Super Contributor
timestamp: May 02, 2013, 06:09:34 am
content: The peak voltage of a sinewave is sqrt(2) times higher than the RMS value. Do some calculations and you will see that the voltage on the inputs of those regulators never dips below the output + dropout voltage.

author: TMM
author_rank: Frequent Contributor
timestamp: May 02, 2013, 06:36:27 am
content: Ah right, so the 2200uF caps should maintain about 25V with some ripple determined by how much current is drawnI somehow got it into my head that the caps would bring it down to 0.707 of the peak voltage
Regulating CR2032 - Page 1
Forum section: electronics / projects

author: docmur
author_rank: Regular Contributor
timestamp: May 21, 2017, 08:09:09 pm
content: Hey GuysI'm using a CR2032 in a small project that draws very low power, under .5 mA total. I'm using a CR2032 and is there any point in using a regulator for it? I know the TPS63031 exists, but should I just connect the CR directory or use a regulator.ThanksDocmur

author: Zero999
author_rank: Super Contributor
timestamp: May 21, 2017, 09:59:49 pm
content: That's impossible to answer without any more information.

author: jbb
author_rank: Super Contributor
timestamp: May 21, 2017, 10:15:28 pm
content: Hi docmurSHIPPING WARNING: of late, the airfreight powers that be have gotten very concerned about lithium batteries (including primary coin cells!!) on planes. So your usual suppliers (Digikey, Element14, Mouser, Sparkfun etc.)may not be able to ship them. So for short runs I suggest you look for coin cells you can buy at your local hardware store.Whew.This is actually a surprisingly complicated question.There are five considerations:Will your circuitry work OK over the whole CR2032 voltage range of 3.2 - 2.5V? (Note that you'll get voltage dips if you draw current pulses which could upset come circuitry).Here's a data sheet.Over the desired life of the battery, how many mAhr will the quiescent current (Iq) of the regulator consume?Over the desired life of the battery, how many mAhr will controlling the output voltage of the regulator help you save?Can you afford the space?Would it be worth the money?You should be aware that buck-boost converters are often a lot less efficient than a buck or a boost. You might do better to adjust your design to make it a buck-only or boost-only supply. The TPS62736 is perhaps a good candidate for a buck design (Iq < 0.5uA!)When you evaluate the power savings in your main circuit, you need to look at active mode and sleep / standby mode consumption. If you're going for ultra-low power sleep modes (e.g. MSP430 something), moving from 3.3V to 2.5V could reduce the sleep current by quite some extent. If you spend lots of time in active mode, remember you need to convert the current drawn by your load into equivalent battery current to make the numbers work.The spreadsheets are calling youuuuuuuu...[Edit: swapped data sheet reference, upped maximum coin cell voltage from 3.0V to 3.2V]

author: docmur
author_rank: Regular Contributor
timestamp: May 23, 2017, 06:18:35 pm
content: Thanks for the advice
regulator circuit logic question - Page 1
Forum section: electronics / projects

author: john23
author_rank: Frequent Contributor
timestamp: August 20, 2025, 11:35:57 am
content: Hello,In the photo shown in the attached link I have a circuit.this circuit is only an example .In page 11 we have a much simpler implemetation of tuning output shown in the link.Two questions:What is the logic of this trimmer and the capacitor attached to it?Its suppose to supply 3A at most to the output,How can we be sure that I_adj=3uA?We can output 1A 2A 3A how can we be sure I_adj will remain 3uA?Thanks.https://ibb.co/JTWXWVShttps://ibb.co/CKtFM59Whttps://www.analog.com/media/en/technical-documentation/data-sheets/1764fb.pdf

author: AnalogTodd
author_rank: Regular Contributor
timestamp: August 20, 2025, 12:44:05 pm
content: This is where you spend the time going through the data sheet. Page 4 says I_adj is typically 3uA, but a maximum of 10uA. Page 7 shows what it looks like as a function of temperature.The value of R5 (4.1k) determines just how much effect I_adj has on your output voltage. With the typical 3uA, your output voltage increases by 12.3mV due to I_adj * R5. If I_adj were to go to 10uA, your output voltage would increase by 41mV. If you need a lower shift, reduce the value of resistor for R5.
Relationship between voltage and frequency in VFDs. - Page 1
Forum section: electronics / projects

author: firewalker
author_rank: Super Contributor
timestamp: June 12, 2016, 11:16:25 am
content: Is there a "mathematical" connection between Frequency and Voltage for VFDs?Alexander.

author: Siwastaja
author_rank: Super Contributor
timestamp: June 12, 2016, 05:06:31 pm
content: Approximately linear for a given torque. Any deviation from the standard linear curve changes the torque that can be delivered. Furthermore, if the torque that the load tries to apply differs from this, slip increases or decreases.Actual control algoritms can be fairly complex and involve math I have had trouble understanding, but if you force the slip to be a constant (i.e., by measuring rpm and apply the frequency plus slip all the time), then the linear V/f relationship and torque control made by using a simple voltage coefficient works fairly well.
Relay "yoke type" ? - Page 1
Forum section: electronics / projects

author: David_AVD
author_rank: Super Contributor
timestamp: October 03, 2014, 04:39:48 am
content: I was reading a data sheet for a relay and one model (12V coil, 30A contacts) is listed with either a "normal" or "J type" yoke.The data sheet didn't elaborate and I'll have to confess I don't know what this means or the implications. Ideas?
Relay base ID - Porsche part or generic - Page 1
Forum section: electronics / projects

author: r-mm
author_rank: Contributor
timestamp: January 18, 2021, 11:52:07 pm
content: Hi all I am working on a sub harness for 90's Porsche and have been buying these relay bases from them direct. Part no 928-610-511-00 Just about every other electrical part on the car is TE/AMP/Molex/Bosch etc. Wondering if anyone recognizes this relay base as another mfgr. It snaps into the power distribution module and is two piece construction. Accepts Fastin Faston 250 and the smaller ones whose number I forgot. 112 maybe.
Relay Contacts - where to find?  - Page 1
Forum section: electronics / projects

author: AvrHornet
author_rank: Newbie
timestamp: May 14, 2023, 09:32:14 pm
content: Hello,First post here and hope to contribute as a hardware engineer of 20+ years. I have a design that needs a small copper strip with a contact rivet on one end - the same that you see in a relay. The middle pole that flexes between the two contacts. If my project works out as planned I would need a few thousands per year so cutting apart a relay would not be feasibleDoes anyone know where I could find something like this? I am attaching a pic showing the electrical contact I am looking for. Thanks in advance!!!Tom

author: uer166
author_rank: Super Contributor
timestamp: May 14, 2023, 09:45:33 pm
content: Definitely need to look at wholesalers, here is the first link I found:https://www.alibaba.com/product-detail/Switch-Relay-Electric-Electrical-Agni-Silver_60401957286.html?spm=a2700.galleryofferlist.normal_offer.d_title.369083affqhUAFI'm sure it can be customized to whatever you need as well.

author: coppercone2
author_rank: Super Contributor
timestamp: May 14, 2023, 09:50:43 pm
content: https://www.norstaninc.com/products/electrical-contact-rivets/https://www.thomasnet.com/products/electrical-contact-rivets-96146451-1.htmlhttps://www.lirrd.com/products/electrical-silver-bimetal-contact-rivet

author: Someone
author_rank: Super Contributor
timestamp: May 14, 2023, 11:02:05 pm
content: " leaf switch"
Relay Driving Circuit, Why 3 transistors? - Page 1
Forum section: electronics / projects

author: GeorgeIoak
author_rank: Regular Contributor
timestamp: November 29, 2018, 04:37:57 am
content: I'm looking at a circuit that's driving a small signal relay. I've seen single transistors to drive the relay and I've seen Darlington pairs to drive the relay but this circuit has 2 NPN and 1 PNP. I simulated the circuit and the circuit works but I'm wondering why use this circuit?Attached are the simulation snap shots of the relay in an OFF state and the relay when it's ON.The 10Hz signal on the left is just to simulate a signal from the 3.3V MCU. The 3.3V and 5V at the top are power sources and everything else is just probes for the simulation

author: daqq
author_rank: Super Contributor
timestamp: November 29, 2018, 05:07:51 am
content: This circuit achieves two things:- the relay is it's powered from +5V and the logic is powered from +3.3V, so level shifting (although there are easier ways in this setup to do it)- it inverts the signal - when the input signal is low, the relay is on and vice versa.

author: GeorgeIoak
author_rank: Regular Contributor
timestamp: November 29, 2018, 05:13:43 am
content: Thank you.So just so my thinking is clear:With 0V on Q1, it is OFF and Q2 is ON which then pulls the gate of Q3 low and turns it ONWith 3.3V on Q1, it is turned on which pull the gate of Q2 low turning it OFF and keeping Q3 OFFTransistors numbered from left to right
Relay holding voltage - Page 1
Forum section: electronics / projects

author: akis
author_rank: Frequent Contributor
timestamp: May 03, 2014, 06:53:48 pm
content: Take a 12V relay that picks up at say, 7V and drops out at, say, 2.5V.I would trigger the relay using a capacitor so that it gets the full 12V momentarily, but after that, what voltage should I drop down to, for "maintenance" ?I presume I can go as far down as, say, 3V, but would that be safe? Eg vibrations, knocks, maybe a sudden drop in the power line?As a guaranteed safety, I was thinking my maintenance voltage would be 7.5V. It is way less than 12V and keeps the coil cool, but at the same time over the voltage that the coil picks up anyway.Am I right?

author: Fank1
author_rank: Regular Contributor
timestamp: May 03, 2014, 07:39:19 pm
content: With BIG relays we usually hold them in at 75%Apply full voltage and use a spare set of NC contacts across an appropriately sized resistor in series with the coil.

author: ejeffrey
author_rank: Super Contributor
timestamp: May 03, 2014, 07:52:37 pm
content: The drop-out rating is the guaranteed dropout voltage: i.e., below which it is guaranteed to open. If nothing else is listed, the pick-up voltage is a safe number to use, so 7.5 volts sounds reasonable.

author: Niklas
author_rank: Frequent Contributor
timestamp: May 03, 2014, 07:53:15 pm
content: Yes, the outline is correct but the details must be checked for the specific application and components.The technique is used with "peak and hold"-style fuel injector to guarantee a fast turn on. The injector resistance is typically between 1 and 2 ohms and is shorted over the drive voltage until the peak current, approx 6 A, is reached. Then the coil current is limited to about 1/4 of the peak current to keep the injector opened and to not overheat the coil winding.It is the coil current that is important. For turn on, the capacitor must be large enough to source the energy to build up the magnetic field in the coil.
Relay Inrush Current "TV" Ratings? - Page 1
Forum section: electronics / projects

author: Dave8266
author_rank: Contributor
timestamp: March 11, 2021, 10:15:08 am
content: I've recently become aware that some power relays have a "TV" rating (TV-3, TV-5, TV-8, TV-10, TV-15) which characterizes their suitability for loads with high inrush currents.For example, a TV-5 relay would be rated for 5A steady state current and 78A inrush, a TV-8 relay 8A steady state and 117A inrush, etc.(And these appear to be the baseline specs - for example, you can buy "TV-8" relays with a higher 10A steady state rating.)Does anyone happen to know how long relays of these ratings are expected/tested to withstand those inrush currents?It seems like the datasheets for non-TV-rated relays are more descriptive... such as "Inrush 30A for 200uS". But anything I've found with a TV rating simply says "TV-8 rated" or the like, with no further details on the timings.More info:https://components.omron.com/relay-basics/general-app
Relay Memory Addressing - Page 1
Forum section: electronics / projects

author: sonnytiger
author_rank: Frequent Contributor
timestamp: March 04, 2014, 01:35:19 pm
content: I have this little design for a one bit relay memory cell, I am sure it is just a standard thing but I came up with it myself at the time.My question is how would I go about addressing multiple bytes using n number of control lines? IE. how do memory chips address all bytes?

author: NiHaoMike
author_rank: Super Contributor
timestamp: March 04, 2014, 03:17:43 pm
content: You'll have to design address selection logic. Pretty clunky to do with relays - even the Goodwill Relay Computer uses solid state memory.http://www.computerculture.org/projects/rc3/

author: sonnytiger
author_rank: Frequent Contributor
timestamp: March 05, 2014, 11:09:40 pm
content: Clunky is the ideaI want to build a little memory unit of of relays because it will sound really cool. I could just have a bunch of relays just clicking but if it actually did something it would be much cooler. I tried to find some memory addressing circuits but didn't have much luck. Can you recommend one? Or maybe get some ideas going?

author: NiHaoMike
author_rank: Super Contributor
timestamp: March 06, 2014, 02:54:20 am
content: One relay can switch between two memory units. Energize the coil from the 0th address bit.Add another set of relays to switch between 4 memory units. Energize the coils from the 1st address bit.Repeat until you have enough address bits.

author: sonnytiger
author_rank: Frequent Contributor
timestamp: March 06, 2014, 07:37:19 pm
content: Right I think I know where you're going with this...I need to think some.
relay poping!! - Page 1
Forum section: electronics / projects

author: angelothewolf
author_rank: Contributor
timestamp: April 24, 2013, 06:50:38 pm
content: hi everybody, im building an active a/b box with volume control for active studio monitors, everything is working ok until i decide to add a mute switch. so i made a little perfboard with 4 G5A-237PL Omron relays, each one is shorting each output pin to ground. the thing is that i cant get rid of the loud spike/pop when i turn the relays off.already try the diode for the coils, etc.there is any way to solve that issue without compromise the signal?

author: commongrounder
author_rank: Frequent Contributor
timestamp: April 24, 2013, 07:24:54 pm
content: Do you have a way to check if there is any DC riding on your audio lines? That would cause a pop when the relays opened (and maybe some when they close). Otherwise the four relay coils may still have enough EMF kick together, even with the damping diodes, to induce a current in your audio lines.

author: Unknown
author_rank: Unknown
timestamp: April 24, 2013, 09:59:49 pm
content: Check that the diodes are correctly placed across the relay coil !, with the ring end connected to the positive of your switched supply... if you find there the wrong way around, and are IN4148 type, replace them.Otherwise, you could try and place a capacitor across each relay coil, a value between 1 Mfd to 47 Mfd with the diode, again positive end of the cap + to the power supply side; also place a series resistor in-line to the relay positive coil end, with a value between 10 to 22 ohms... this will depend on the relay pull-in working voltage, but is a good starting point.If none of this helps, then it's likely the signal line inputs are at a charge level; e.g. your equipment in-out line capacitors have a DC charge, at each internal equipments blocking capacitor... by switching this potential to ground, will then discharge the in-out cap voltage, thus your popping.The problem might be somewhat hard to resolve; mainly because you need to bleed away the DC potential build-up to ground, before you hard switch them. Adding a resistor on the in-put and out-put line feeds to ground, may reduce or remove the problem ?. So when your relay switch comes-in, the caps are near to ground reference potential, instead of floating between coupling potentials; particularly if there not internally, impedance terminated.If your studio system is based on 600 ohm impedance, then a 1K2 value should do, placed on the in and out lines, e.g. between your relay contacts equipment in and out line connections... however, if the studio is based on 47K impedance, then terminate with 82K values.
Relay selection, input/output capacitance, trap for young players - Page 1
Forum section: electronics / projects

author: Fusion916
author_rank: Regular Contributor
timestamp: November 27, 2017, 06:55:51 am
content: Be very careful with your intended frequency of operation vs the input/output capacitance from your relays. I didn't pay too much attention to my relay selection other than cost and "on" resistance, but I didn't bother checking the "off" capacitance. I was getting a ton of feed-through on my relays when the relay was "off". After lots of debugging the root of the problem was too much series capacitance from the input and output terminals.Here is a bode plot of two relays, the one I was using now (130pF), vs an older one I used that didn't have the off state feed-through issue:130pF relay:~1pF older relay:The signal going through these relays have frequency components 5MHz+. Bode plots are self explanatory.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: November 27, 2017, 08:53:24 am
content: How do you get 130pF in a relay? Is it not photoMOS?Got extras to tear down?Tim

author: dmills
author_rank: Super Contributor
timestamp: November 27, 2017, 10:27:33 am
content: Indeed, 130pf is **Massive**, my usual issue with relays is more in the on state inductance line then off state cap.What load resistance are you working into?Another trap with relays is that they do not usually do well with very small signal 'dry' switching, you want to arrange for some reasonable amount of current to flow to puncture the layer of oxides and contaminants that the contacts tend to pick up, even the specifically "Low signal" parts benefit from some standing current. About the only type which is really immune to this are the mercury wetted ones, but they are getting hard to find these days (And have other issues).Regards, Dan.
Relay switch connected to microcontroller Power Up Power Down Circuit - Page 1
Forum section: electronics / projects

author: DaveHardy
author_rank: Regular Contributor
timestamp: March 09, 2013, 03:08:31 am
content: I'm in the process of creating an imbedded design. I need to power up and power down this circuit via a momentary push button switch so that the mains are cut off to basically everything associated with the circuit. I am using an atmel atmega 328p microcontroller.What is a good way to go about this? I know that some of the bigger relays require around 25ma to power them. Also, what is a good way to keep the processor in sleep mode without mains power?

author: TerminalJack505
author_rank: Super Contributor
timestamp: March 09, 2013, 05:47:08 am
content: For the push button power switch, look at the circuit referenced inthis post.So far as keeping the processor in sleep mode goes, that's software controlled, obviously. You'll need to shutdown everything except the signal that tells your MCU that mains power has returned. See the attached schematic snippet for how I did this for a project. Note that the MCU is powered from the 3V button cell when the primary power source is absent. An LTC4412 OR-ing controller IC handles the switch over between the two power sources. It doesn't sound like your project will be battery powered while it is sleeping but it will still have a similar signal that tells it that it needs to be in low power mode.The LPM signal goes to the MCU's INT1 pin, which is a high-priority interrupt. When the interrupt is triggered, in the case of my project, I just set a global variable based on the pin's value. My project is completely interrupt driven so the main() function is nothing more than a state machine that keys-off of that variable (and some other conditions) and controls the MCU's sleep mode based on it.I can post my project source if you're interested. It's not my best effort (I kind of hacked it out over a weekend) but it sounds like what I did is going to be very similar to what you are going to do. In my case I kept the RTC enabled but you might not need that.

author: amspire
author_rank: Super Contributor
timestamp: March 09, 2013, 06:23:33 am
content: Quote from: DaveHardy on March 09, 2013, 03:08:31 amYou can consider using latching relays. These magnetically latch to either the ON of OFF state and you only need power to pulse the coil to change the switch state. In eaither state, the relay uses zero power.

author: DaveHardy
author_rank: Regular Contributor
timestamp: March 10, 2013, 10:41:12 pm
content: Thanks for the responses.
Relay V23086C1001A402 - Dimensions Diagram - Page 1
Forum section: electronics / projects

author: 2X
author_rank: Frequent Contributor
timestamp: July 06, 2025, 08:56:19 pm
content: Hi,I have the below relay and I can't understand what means the two tables on the red circles at the below image?What means "x5", "0.3", "0.4", "M", "A", "C" (I want to make a footprint of this relay)?

author: TimFox
author_rank: Super Contributor
timestamp: July 06, 2025, 09:24:03 pm
content: "5x" means five instances or places of identical thingy

author: Cpuch22
author_rank: Contributor
timestamp: July 06, 2025, 09:25:25 pm
content: They are GD&T tolerancing symbols. I am not an expert in GD&T but I believe its saying that the positional tolerance of that feature is within 0.4 of datums A and C and .3 of Datum A at maximum material condition (thats the M in a circle). Everything else is "Basic" (has the box around the dimension) meaning they are exact dimensions with reference to that point which has the positional tolerances listed.

author: 2X
author_rank: Frequent Contributor
timestamp: July 06, 2025, 09:50:05 pm
content: Quote from: TimFox on July 06, 2025, 09:24:03 pmThere is only two of the squares in the desing and not five. Show why x5?How to Read a Feature Control Framehttps://www.inspectionxpert.com/blog/how-to-read-a-feature-control-frameCommon GD&T Symbolshttps://www.inspectionxpert.com/gdt/geometric-dimensioning-and-tolerancing#font-download#tab2

author: 2X
author_rank: Frequent Contributor
timestamp: July 06, 2025, 09:53:32 pm
content: Quote from: Cpuch22 on July 06, 2025, 09:25:25 pmDo you know why there are two tables (left table and right table) and not only one? Both two tables are shown the same object/square/pin.
Relay with inbuilt manual switch - Page 1
Forum section: electronics / projects

author: Gowda1
author_rank: Contributor
timestamp: January 15, 2021, 09:20:09 am
content: Hey Guys, I have a question regarding the manual type relay switch shown in the datasheet. I need relay with Dual coil-latching, I thought of using momentary toggle SPDT to Turn on and off the relay but I will not be knowing the position of the lever of the switch (Whether it is set or reset). If I use relay with the inbuilt manual switch which is on the top of the relay, is it possible to set and reset the relay using that without needing any external momentary switches? If I use the normal one then I would be needing additional digital latch or flipflop. Please let me know if I can the manual switch type relay and also let me know if there are any disadvantages with the manual type relay switch.FYI: Relay - ADJH23112

author: wizard69
author_rank: Super Contributor
timestamp: January 16, 2021, 12:32:03 am
content: I'm not sure I understand your question. These are latching relays which should hold state after the applied signal.

author: Psi
author_rank: Super Contributor
timestamp: January 16, 2021, 02:44:09 am
content: If I understand you correctly then yes.You can use that relay by simply switching the manual switch on top. That's what the manual switch is for.Another option is just use a momentary DPDT with the extra contacts connected to an LED so you know which position it is in. But that may not work for low/battery power applications.

author: Gowda1
author_rank: Contributor
timestamp: January 16, 2021, 01:01:06 pm
content: I could not understand the part where u mentioned momentary DPDT switch. U mean to connect it across the relay output? if so, the line is working at 40A rms, so it is not possible to add LEDs
Relay/controller issues - Page 1
Forum section: electronics / projects

author: Zingiberofficinale
author_rank: Newbie
timestamp: May 29, 2025, 10:26:57 pm
content: Hi Folks,Apologies if this is a numpty question.I am designing what I thought was a simple circuit to turn on an irrigation pump when a solar controller calls for demand.Diagram attached (excuse glare).The solar controller (that also houses a pump which is too small for my needs) is an Irrigatia C24L. It is not clear what the switching current is, but it takes 3x AA rechargeable batteries.https://shop.irrigatia.com/irrigation-kits/c24-l-series?_gl=1*1xdlj1t*_up*MQ..*_gs*MQ..&gclid=CjwKCAjwi-DBBhA5EiwAXOHsGYY8MuKehycKFuhcFiHzDDhkjq4DFRR0gmGB1AshLuIpKYcX9vErLRoChdoQAvD_BwE&gbraid=0AAAAAqyKR90HHGDn-02zJdiQIUkD6rSliTransformer is 240v AC to 12V DC supplied to switch (working fine)The switch is a SP 3 Position Double Throw Cam Switch, 10A (tested and working fine)-https://uk.rs-online.com/web/p/cam-switches/0340291Switch has three positions (ON - live to 12v pump; OFF; Auto - NO Solar controller on/off).I have tested the circuit with a spare relay I had (coil could be switched by 9-12v or higher). I triggered the circuit with a variable 3-12v DC supply I have (relay coil only operated at higher end).Circuit worked fine, so I looked to buy a lower DC voltage to match the lower voltage from the solar controller (which is two leads + / - approx 3v).I then looked into options for lower voltage triggers for the relay (charging the coil).Bought this unit, but made the mistake of not checking the input voltage for the coil (12v). Wired NO/Com for relay output, and DC+, DC- for the trigger/coil side.https://www.amazon.co.uk/dp/B0D9NKVFH9?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1Solar controller had insufficient voltage to trigger relay coil.Double checked circuit using variable 3-12v DC supply I have, worked fine above 9V to trigger coil and relay from NO to closed.So bought this relay board as it states 3v operating current for coil and should work for my circuit.https://www.amazon.co.uk/PENGLIN-Module-Optocoupler-Trigger-Expansion/dp/B0BJNPKHDG/ref=cm_cr_arp_d_pl_foot_top?ie=UTF8&th=1Frustratingly the circuit does not work, no matter what combination of connections I try.Looking at the diagrams associated with the relay:Relay board output, has a common (-), plus either a NO or NC connection. This makes sense and seems to apply to the switching side of the circuit (connected to pump).The inputs for the relay board are labelled, VCC, IN, GND.My reading of documents (pictures on website link above) is that the VCC is the positive (+ from solar controller); GND (- from solar controller).Have also tried VCC (+ from solar controller); IN (- from solar controller).Have also tried manually switching relay coil using variable 3-12v DC supply, no success!Is there a way to utilise this relay board (or similar ones) to run at lower (3V DC)?What am I doing wrong.Or is there a better alternative means to take a 3v switching current from the solar controller (NO) to turn on the pump?Thanks in advanceMark
relay/MOSFET/IGBT for HID lights from 500W up to 10KW :/ - Page 1
Forum section: electronics / projects

author: Morgoroth
author_rank: Regular Contributor
timestamp: March 03, 2016, 02:03:20 pm
content: Hope you guys could me here, I have a mess with too much information around and ignorance from my part.Well, the goal is design a solution to switch (on/off)HIDlamps, since 1KW up to 10KW, could be different designs.Few considerations with this lights:inrush currentnoise (EMF)dV/dtpower factortotal powerSeems like any industrial relay would work, but in power design things are never so simple and I have no idea what protection must be considered with them, and almost all information I found is relative to automotive lamps, not even 1/2 of the power I need to control.Things I think I know (this matter is away from my knowledge field):.- big inrush current could be present, so, any switching device must be properly selected..- big dV/dt could be present proportional to power..- this lights have a high nonlinear behavior, so any control system is complex and prohibited for time and budget, I need a simple solution..- noise is a problem that must be handled by isolating control system, problem is calculate how much isolated must be, and probably PCB considerations are important here give the amount of power to control.Now, I handle this solutions:mechanical relays: cheap solution, but give the power to handle and characteristic of the load, sparks could be a problem, reducing the life time and injecting noise all around.solid state relays: too expensive give the inrush currents.MOSFET/IGBT: require a control design and I'm worried about the dV/dt. I've seen power factor correction as a solution, there is dedicated chips that allow on/off lights, but not sure if worth the effort when I just want to switch the lights.I'm lost here, and I want someone with experience on this field help me to found a solution or a direction where to go, or not to go.Thanks in advance.JP

author: CM800
author_rank: Frequent Contributor
timestamp: March 03, 2016, 02:34:44 pm
content: Given that the wiki link says they are AC components, (or even just cut off before a rectifier if there is a DC component)Use a SCR / Thyristor, you can get them at ludicrous current ratings and voltage ratings.
release project as template in altium vault - Page 1
Forum section: electronics / projects

author: zeinab
author_rank: Newbie
timestamp: May 28, 2017, 08:19:58 am
content: hii want to create and link a project template in Altium vault ,i just created a target in altium vault explorer and made a project in Altium and saved itbut in project tab >> release to vault as template does not existMy altium vault version 14.1,altium vault 3.010thanks
Reliability of Connectors Under Overload Conditions - Page 1
Forum section: electronics / projects

author: German_EE
author_rank: Super Contributor
timestamp: August 05, 2016, 10:15:05 pm
content: Those of you interested in the electrical side of things may find the following video of interest:

author: Monkeh
author_rank: Super Contributor
timestamp: August 05, 2016, 10:35:19 pm
content: Shame the wire failed early.

author: CatalinaWOW
author_rank: Super Contributor
timestamp: August 06, 2016, 02:40:36 am
content: Seems that all of these connectors can handle anything that is safe to put through the wires. Once the insulation on the wire is failing you are far past the point of any rational usage.
Reliability of relays - Page 1
Forum section: electronics / projects

author: balage
author_rank: Regular Contributor
timestamp: June 07, 2019, 09:13:56 am
content: Hi Guys,I was using an Omron-made latching relay in one of my designs since 5 years. I have found an alternative part that costs half of the Omron. It is a Takamisawa relay. See the datasheets of both below.https://hu.mouser.com/datasheet/2/307/en-g6s-1128313.pdfhttps://www.ret.hu/media/product/14991/437743/NA-serie.pdfIt is used in a polarity switching circuit on 600V. When the relay is about to be switched, the voltage source is disabled, so the relay has to handle this voltage only when operation is done.I have never had any problems with the Omron. Can I trust the Takamisawa relay? What is your opinion? Maybe they are made in the same factory, who knows...Thanks and cheers,

author: Rerouter
author_rank: Super Contributor
timestamp: June 07, 2019, 09:20:01 am
content: relay life testing is pretty easy, just set it up in line with a constant current source at your ideal load, and just have it switch over and over and over, until the steady state voltage of the power supply gets high enough that its outside of resistance spec.Cant speak for the other brand, just know I've never had any issues with omron either.
Reliability vs Lead-less IC packages - Page 1
Forum section: electronics / projects

author: RogerThat
author_rank: Regular Contributor
timestamp: August 14, 2024, 06:57:12 am
content: Hi everyone,Some years ago I investigate this and the consensus was that leaded parts (TQFP, SOT-23 etc) was considered more reliable than lead-less(DFN,VQFN etc). The application is/was for harsh enviroment: vibration, hot/cold, moisture etc.I'm now researching new parts for the next project and I'm seeing lead-less parts being advertised as "high reliability for harsh enviroment", mainly DFN discrete transistors.Has there been any new research showing that lead-less parts are equal or surpassing leaded parts for reliability?

author: RogerThat
author_rank: Regular Contributor
timestamp: August 30, 2024, 09:52:23 am
content: According to a Vishay's DNF soldering guide it is possible to achieve up to 5000 cycles now(link below). Still a bit short of the +10000 cycles for leaded parts.https://www.vishay.com/docs/86198/sold_rec_for_dfn_packages.pdf
Reliability/Handling VSC8574XKS-05 - Page 1
Forum section: electronics / projects

author: Annoyed_by_PHY
author_rank: Newbie
timestamp: February 21, 2024, 04:53:42 pm
content: Does anyone have experience with the component quality, assembly and operation of ETH-Phy VSC8574 (VSC8574XKS-05) from Microchip?We are having massive problems getting the part to work.
Reliable certified Bluetooth module? - Page 1
Forum section: electronics / projects

author: Pack34
author_rank: Frequent Contributor
timestamp: January 15, 2017, 09:02:14 pm
content: So it appears that the Microchip RN-42 is no longer suitable for new designs. Even with the latest firmware it does not reliably work between computers.Does anyone know of a reliable one to act as a wireless serial bridge?

author: Pack34
author_rank: Frequent Contributor
timestamp: January 16, 2017, 05:58:27 pm
content: Price isn't an issue.Since it's an MCU, does it require to be programmed, or is it ready-to-go on power up or require a string of configuration commands over the UART during boot-up?

author: NiHaoMike
author_rank: Super Contributor
timestamp: January 17, 2017, 01:08:20 am
content: https://ssihla.wordpress.com/2013/01/04/adding-bluetooth-to-the-msp430-launchpad/Looks like it's just a matter of connecting it and powering it up. I actually have a few of those chips lying around somewhere, but never used them since I ended up using some other module for Bluetooth.
Reliable long 1-wire driver - Page 1
Forum section: electronics / projects

author: LukeW
author_rank: Frequent Contributor
timestamp: November 14, 2018, 02:00:39 pm
content: Maxim's application note here has much detail on reliable 1-Wire networks with relatively long cables - capacitive loading, reflections, etc.https://www.maximintegrated.com/en/app-notes/index.mvp/id/148Appendix A's "Improved CPU Bus Interface" shows a circuit for reliable operation, but it uses two microcontroller port pins.Ideally, I want a circuit that can be a "drop in replacement" in series with a single data line, in a pull-up 1-Wire bitbanging arrangement - I don't want to change the code or use an extra GPIO pin. Is there any way to realistically get rid of it?

author: rstofer
author_rank: Super Contributor
timestamp: November 14, 2018, 02:35:25 pm
content: Not with that circuit. The FET does the signalling by pulling the signal line low but it's not possible to sense the line state. So, the top pin is used to sense and the bottom pin is used to drive.Just guessing...

author: LukeW
author_rank: Frequent Contributor
timestamp: November 15, 2018, 01:04:22 am
content: Does anybody have a code example (PIC, AVR, Arduino, whatever) that can support 1-wire in these multi-pin configurations in large networks?

author: JVR
author_rank: Regular Contributor
timestamp: November 15, 2018, 10:22:33 am
content: LINBus not what you are looking for?

author: kony
author_rank: Regular Contributor
timestamp: November 15, 2018, 03:20:32 pm
content: Seconding the LIN suggestion. It is very resillient and well prooven. With bit of modification of the protocol, you can even add slaves IRQ. I have used it for modular system of actuators and sensors in past, and it made it very flexible for customisations, yet robust.

author: SiliconWizard
author_rank: Super Contributor
timestamp: November 15, 2018, 05:41:55 pm
content: Quote from: LukeW on November 15, 2018, 01:04:22 amYou would just have to modify the existing code to use a separate input port and output port for writing and reading instead of using the same... doesn't seem that hardEdit:Quote from: LukeW on November 15, 2018, 01:04:22 amThose two statements seem a bit contradictory...Unless... you don't have access to the original code. In which case you'd have to rewrite the whole software anyway.

author: David Hess
author_rank: Super Contributor
timestamp: November 21, 2018, 03:37:29 am
content: The first thing I would do to improve reliability is replace the pull-up resistor with a current source.
reliable MIPI display supplier - Page 1
Forum section: electronics / projects

author: koty0f
author_rank: Newbie
timestamp: June 11, 2018, 06:29:49 am
content: Hello there,does anybody has expirience with reliable MIPI display supplier?We search for 4-5" capacitive touchscreen and MIPI display 480-720p for embedded device which have only MIPI DSI interface available. I also found some DSI bridges (ANX7805, SN65DSI83) to convert signal to LVDS or similar (possible usage of panel with different interface), but the native MIPI display would be better due to cost reduction.We plan to use "universal" connector on main board containing MIPI signals, i2c and power. Second "display" board will be connected to the main board to create specific power levels to drive backlight and also to reroute signals to connector used on display.There are many chinase display supliers but I'm not confident about the reliability. Just few concernes comming into my mind.1. It is common that first few batches has good parameters but through the time supplier tries to make shortcuts and quality decreeses.2. Reliability in terms of time. It is also common small suppliers to vanish from market without any warning.3. How difficult is it start to use differend display which has "same" interface? For ex. 4-lane MIPI, same resolution and also capacitive touch.4. Also the price is huge deal breaker. Ideal price would be under 12 USD.We are heading to produce about 1k per month. I'm sure some of you have better experience with this due to it is our first product of that kind. Any help appreciated.