hybridfree/eevblog-posts huggingface dataset:
Simulating an AC load in LTSpice - Page 1
Forum section: electronics / projects

author: electrotwelve
author_rank: Contributor
timestamp: April 27, 2016, 03:50:47 pm
content: Hi, Can anybody help me in simulating an AC mains load in LTSpice? Current range would be 1A to 15A. I tried a couple of options such as placing a current source on the neutral line of the voltage source (set to 220V AC). Not sure if that is working.

author: f5r5e5d
author_rank: Frequent Contributor
timestamp: April 27, 2016, 05:33:36 pm
content: not really enough info there - a particular ambiguity is "AC"do you mean "a load for Spice .AC analysis"? in which case you need to recognize, allow for the special conditions of 'Spice .AC analysis: linearizing a circuit about and operating point - no detailed simulation beyond operating point is done so many nonlinear circuits/components like rectifier diode bridges don't give very useful results in .AC analysisif you want to model the AC mains then a 50/60 Hz sine Vsource with maybe ~1 Ohm series resistance is a start, then model the load as closely as wanted out of standard parts, run a .TRAN analysis long enough to reach steady state...

author: electrotwelve
author_rank: Contributor
timestamp: April 27, 2016, 05:57:55 pm
content: OK more info: I wanted to model an AC load that draws current. For e.g. a heater that draws 10A of current at 220V AC.

author: Siwastaja
author_rank: Super Contributor
timestamp: April 27, 2016, 05:59:43 pm
content: Heater is simply modelled using a simple resistor. Press R and you have your heater.
Simulating CAN - Page 1
Forum section: electronics / projects

author: SparkFly
author_rank: Regular Contributor
timestamp: May 21, 2017, 09:38:48 pm
content: Hi,I'm trying to simulate a CAN transmitter in LTSpice, based on this diagram:The circuit works as expected for a CAN '1' (both outputs across 120R resistor are 2.5V, inputs are 1, 0), but when I try to simulate a can '0', the difference across the 120R is far too small. It should be around 3.5V and 1.5V. My circuit is as below.Can anyone offer any advice as to where I am going wrong? When I increase the resistance of the 120R resistor, I get a bigger differential voltage, but my understanding is that CAN should be terminated by 120R.Many thanks in advance.

author: langwadt
author_rank: Super Contributor
timestamp: May 21, 2017, 10:00:37 pm
content: M5 is upside down, and pick some actual parts for M5/M6 the generic PMOS/NMOS doesn't work

author: SparkFly
author_rank: Regular Contributor
timestamp: May 21, 2017, 10:24:54 pm
content: Thanks Langwadt, I now have it working as expected.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: May 22, 2017, 07:53:46 am
content: The symbol is upside down to convention (the gate usually comes out from the source side), but as the substrate is connected correctly, and the default model isn't asymmetrical (D and S are interchangeable), it doesn't actually matter.Also, this is the first time I've seen those outrageously wrong MOSFET symbols in a slightly-less-wrong configuration:Luckily you put together the circuit correctly, despite that.If people would realize that the original, and actually correct and useful, MOSFET symbol actuallymeans something, by itself, this wouldn't be confusing.Tim

author: SparkFly
author_rank: Regular Contributor
timestamp: May 22, 2017, 11:45:28 am
content: Thanks T3sl4co1l.The wide variety of symbols are quite confusing... :/Thanks for your input.
Simulating Coilcraft Inductors - Page 1
Forum section: electronics / projects

author: T3sl4co1l
author_rank: Super Contributor
timestamp: April 04, 2017, 08:01:09 pm
content: This should be of great interest to anyone working with simulations of power converters or RF circuits!http://seventransistorlabs.com/Calc/Coilcraft1.htmlIt's rough and beta-ey, but I think I cranked out most of the dumb bugs, and am getting useful results.Ideas, comments?Tim

author: diyaudio
author_rank: Frequent Contributor
timestamp: April 05, 2017, 02:24:51 pm
content: Thank you for sharing. I work alot with Miro Metals / Arnold cores (material -7) but this should be interesting.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: April 12, 2017, 04:44:20 pm
content: Updated yesterday. Now you can adjust the parameters to get an even better match between models!Tim
Simulating filter for conducted emissions with LTSpice - Page 1
Forum section: electronics / projects

author: luky315
author_rank: Regular Contributor
timestamp: September 20, 2023, 11:07:44 am
content: I have yet another EMC problem with one of my products. It should comply with CISPR 32/EN 55032 Class B, but the question is more fundamental:The Idea was to use the measured input current and input voltage to simulate the required filter in LTSpice. I know that this is not the final solution and that there are a lot of unknown parameters, but I want to get a feeling which component is improving the results in which frequency range and also to simulate and minimize the PE leakage current (which is to high with the currenty used input filter)So I have the input current and voltage measurements (see the attachment for the imported waveforms) from the product without the input filter. Unfortunately the measurement is not with the appropriate CISPR32 compliant LISN (I don't have one), but with an isolation transformer.First question: Is it possible to "correct" for the output impedance of the isolation transformer and add the LISN to the simulation so that I can play arround with the (simulated) input filter or is this not possible with the available data?
Simulating floating bench power supply stability - Page 1
Forum section: electronics / projects

author: Chosee
author_rank: Newbie
timestamp: April 18, 2020, 03:28:48 pm
content: HelloI have read around a lot, and i can't seem get my head around simulating the loop gain of a floating power supply. I have tried a bunch, but what i can't figure out is how the 'ground' being the positive of the supply output affects the loop gain measurement. Can someone help me with a good way of simulating loop gain in a floating power supply. How to hook up the ac stimulus correctly for instance.I have attached the design i am trying to simulate here.Thanks a bunch! :)

author: udok
author_rank: Regular Contributor
timestamp: April 18, 2020, 06:04:16 pm
content: Put a voltage source with zero volt and AC=1 between the + opamp input and R20. The loop plot is the voltage at R20 divided by the voltage at the + input.
Simulating LEDs in LTSpice - Page 1
Forum section: electronics / projects

author: lilmantis
author_rank: Contributor
timestamp: March 01, 2019, 03:49:43 pm
content: I am trying to simulate LEDs in LTSpice and the PSpice model available looks like this:.MODEL SPMWHT541ML5XAR0S0_AZ_Min D+ IS=9.5E-26+ N=1.83199622528087+ RS=1.55320994268357+ TRS1=-0.00109167328584789+ TRS2=0+ EG=2.1+ XTI=27.4316298646001*$.MODEL SPMWHT541ML5XAR0S0_AZ_TYP D+ IS=9.5E-26+ N=1.88254340719771+ RS=1.59634934164592+ TRS1=-0.000948164679596289+ TRS2=0+ EG=2.1+ XTI=30.8148132453387*$.MODEL SSPMWHT541ML5XAR0S0_AZ_MAX D+ IS=9.5E-26+ N=1.89968242930065+ RS=1.61078235439033+ TRS1=-0.00109389046815565+ TRS2=0+ EG=2.1+ XTI=31.1809226106151*$In LTSpice I made 3 components based on the QTLP existing models as follows:.model QTLP690C D(Is=1e-22 Rs=6 N=1.5 Cjo=50p Xti=100 Iave=160m Vpk=5 mfg=Fairchild type=LED).model LED_Min D(Is=9.5e-26 Rs=1.55320994268357 N=1.83199622528087 Cjo=50p Xti=27.4316298646001 Iave=200m Vpk=5 mfg=Samsung type=LED).model LED_TYP D(Is=9.5e-26 Rs=1.59634934164592 N=1.88254340719771 Cjo=50p Xti=30.8148132453387 Iave=200m Vpk=5 mfg=Samsung type=LED).model LED_MAX D(Is=9.5e-26 Rs=1.61078235439033 N=1.89968242930065 Cjo=50p Xti=31.1809226106151 Iave=200m Vpk=5 mfg=Samsung type=LED)There are some parameters in the PSpice model that do not appear in the LTSpice ones. Any idea how importand those are(EG and TRS) and what is the effect?

author: SiliconWizard
author_rank: Super Contributor
timestamp: March 01, 2019, 04:35:45 pm
content: Refer to the description of the diode model in the inline help.LTSpice does support Eg, Trs1 and Trs2 parameters. The LTSPice provided models for many of the diodes and transistors are simplified ones and don't make use of all the supported parameters actually.Eg is the activation energy in eV, Trs1 and Trs2 are temperature coefficients. If not provided in the model, LTSpice will use default values which are mentioned in the help.

author: lilmantis
author_rank: Contributor
timestamp: March 05, 2019, 11:24:53 am
content: Thank you for the help. All the best.
Simulation of an LED as a load for an inverter - Page 1
Forum section: electronics / projects

author: nenea dani
author_rank: Regular Contributor
timestamp: April 02, 2021, 11:08:06 pm
content: Dear colleagues, I tried to build a device that simulates a series of LEDs in series so that I can test if a generic LCD TV inverter works correctly. I thought I should simulate a load as a kind of LED that should work at n x 3V(6V) and at a current between 100mA and 400mA, n being a number of LEDs. As we know LCD TV inverters have over voltage , over current and lack of load protections which greatly complicates things. Moreover, at start-up in some cases they may be forced to check a maximum current supported by the LEDs. Any error stops the inverter immediately so there is no time for tests. I suspect that the I / U feature of the LEDs is what the LED controller is checking. I built a constant current load from an AO and a high voltage transistor. It can maintain a constant current adjustable between 50mA and 600mA if I apply a minimum of 12V and a maximum of several tens of volts to the terminals. It did not work, although I tested several inverters that would fit the voltages and currents. I have attached my scheme. Can anyone guide me?

author: coppercone2
author_rank: Super Contributor
timestamp: April 03, 2021, 03:47:36 am
content: LEDs are so cheap you should probobly just get a bunch of them, its better anyway because you can see flicker and stuff like that.if you need different loads then make it switch programmable.

author: techneut
author_rank: Regular Contributor
timestamp: April 03, 2021, 07:12:34 pm
content: My guess is that because the inverter is a current source and you apply a constant current load the inverter goes in error. You may need a constant voltage load.

author: penfold
author_rank: Frequent Contributor
timestamp: April 03, 2021, 08:24:29 pm
content: What happens with a resistive load?As has been mentioned, the circuit you've proposed won't play well with current-controlled sources, unless your programmed load current equals the source current, the voltage will just either stay quite low or jump high, probably tripping protection in either case. You can add some voltage feedback to the non-inverting opamp input that will "soften" the load characteristic and make it appear more like a "current source with parallel resistance" (if output voltage goes high, then it raises the current demand which pulls more current and brings the voltage down).Just as a secondary thought, whilst the LM386 should be fast enough to control the load under normal operation, what I can't say for sure is how fast it recovers from saturation at the moment you connect/switch on the inverter... depends on how twitchy the protection circuits are whether or not that will be a problem.
Simulation of the double relaxation mode of a transistor - Page 1
Forum section: electronics / projects

author: tipa
author_rank: Newbie
timestamp: March 16, 2024, 07:48:38 am
content: Health to everyone! I created a 'birelaxator' in the Multisim 14.2.0 program. Who can repeat this?-------------------------------------Why doesn't gif work on this site?, although it works on other sites...https://www.cyberforum.ru/printed-circuit-boards/thread3122327.html#post16986370https://www.cyberforum.ru/attachments/1430402d1690447204

author: Terry Bites
author_rank: Super Contributor
timestamp: March 16, 2024, 03:26:43 pm
content: Links to .ru sites are mysteriously blocked.

author: Ian.M
author_rank: Super Contributor
timestamp: March 16, 2024, 03:51:29 pm
content: This forum recompresses image files to save bandwidth and prevent various exploits. This has the side effect of disabling animated GIFs.

author: tipa
author_rank: Newbie
timestamp: March 16, 2024, 05:22:52 pm
content: And here is war and politics...

author: Ian.M
author_rank: Super Contributor
timestamp: March 16, 2024, 06:53:55 pm
content: Quote from: tipa on March 16, 2024, 05:22:52 pmNo. Both those topics are forbidden here, and your cyberforum.ru links worked for me, so maybe Terry's browser or ISP has a problem with them. If a link does breach forum policy, our moderators delete it, they don't block it.

author: soldar
author_rank: Super Contributor
timestamp: March 16, 2024, 09:22:28 pm
content: Quote from: Terry Bites on March 16, 2024, 03:26:43 pmNot for me they aren't. Must be your internet provider.

author: soldar
author_rank: Super Contributor
timestamp: March 16, 2024, 09:23:36 pm
content: Sorry for double post. I got a Bad gateway error.

author: SiliconWizard
author_rank: Super Contributor
timestamp: March 16, 2024, 10:04:21 pm
content: Quote from: Terry Bites on March 16, 2024, 03:26:43 pmNot for me. Ah, the "mysteries" of censorship.

author: SiliconWizard
author_rank: Super Contributor
timestamp: March 16, 2024, 10:28:28 pm
content: Not able to get this oscillating using LTSpice, but I'm not sure it properly simulates breakdown.

author: tipa
author_rank: Newbie
timestamp: March 17, 2024, 10:16:58 am
content: Much respect for the good answer!Is there a way to bypass this compression?Maybe through a third-party resource where gif files are stored?I would really like to see pictures moving on this forum - it sometimes saves dozens of pages of text...

author: tipa
author_rank: Newbie
timestamp: March 17, 2024, 10:22:59 am
content: The most important thing is that it is not a war!!!

author: tipa
author_rank: Newbie
timestamp: March 17, 2024, 10:34:29 am
content: If you're interested, I'll give you a link to the site where we 'play around' with spice syntax and netlists.This scheme should not work in your program, because it contains two relaxation generators on diacs, and are hidden in ARBITRARY_SPICE_BLOCK (something similar should be in LTshttps://kazus.ru/forums/showthread.php?t=121673&page=268
Simulation software for designing a LED VU meter? - Page 1
Forum section: electronics / projects

author: mkiijam
author_rank: Regular Contributor
timestamp: January 08, 2023, 02:11:46 am
content: I have built many LM3914,15,16 LED driver circuits, but those chips are not for new designs and NLA from most suppliers. I'm planning on switching over to LM339, but have had some issues in the past with the LM39XX series being frequency dependent and other things.Is there a good simulation software that one would trust to design a LM339 comparator circuit and light up some LED's with, but all in SIM space?

author: Terry Bites
author_rank: Super Contributor
timestamp: January 08, 2023, 10:21:11 am
content: See this thread.https://forum.allaboutcircuits.com/threads/question-about-lm339-simulation.171203/You might want to try tina first - its a TI spice model.NI MultisimAutodesk EagleLTspicePSIMEasyEDAKiCADCEGAR Logic SimulatorTina TIidealCircuitMicrocapProteus etc

author: CaptDon
author_rank: Super Contributor
timestamp: January 08, 2023, 03:57:54 pm
content: I have used the quad versions of the LM741's as Led drivers for bar graphs and I like the 10 segment 20 pin 5 green / 3 yellow / 2 red displays. You can put a 10 segment all green under it if you like lots of visual range. Also with individual comparator type circuits you can adjust the typical R2R ladder to be log, lin or a combination of both. Also, you can use one portion of the quad 741 as a buffer / amplifier if you are measuring low levels. The buffer / amplifier can also be set up as a precision rectifier to drive the signal input side of your comparators. You can choose a capacitor with series resistor to set the 'VU' rise time and a parallel resistor across the capacitor to set the 'VU' decay time. I built an entire metering back plane for a 24X4X4 mixer board for live sound gigs. I think if I were going to build something similar today I would start with 16 channel analog muxers, drive an A to D converter and use a CPLD or FPGA to gather the data and drive a muxed display. The analog muxers and A to D stuff is fast enough today to make the display appear as 'real time' and the 'VU' ballistics could be done with programming. Cheers, best wishes!!
Simulation software for solar energy management system - Page 1
Forum section: electronics / projects

author: sougatachakraborty50
author_rank: Newbie
timestamp: August 29, 2020, 03:53:35 am
content: Hello everyone!I need to simulate a solar energy management system (grid-tie). Not large scale, just for 2-3kW. The system would contain pv array, mppt charge controller, battery, inverter etc. I also have to send the total electricity generated to a mobile app. Before building the actual system, I would like to simulate the system. Which simulation software should I use for this?

author: NiHaoMike
author_rank: Super Contributor
timestamp: August 29, 2020, 04:09:25 am
content: Pretty easy to do with Python, the hard part is getting actual solar and energy use data. I suggest using a small solar panel (one for a calculator or garden light would be ideal) connected to an Arduino or similar and positioned at about the same angle and location as the center point of the actual array. For completeness, set up a time lapse camera so you can tell which panels in the array would be shaded at different times, keeping in mind the angle of sunlight will change throughout the year so beware of shadows getting close to the array area.Getting the real time energy use is easy in theory but there are a lot of things to consider in practice, namely having to work around high voltages when installing the sensors. One method I suggested a long time ago was a FM transmitter connected to some current sensors along with a FM receiver plugged into one channel of a sound card combined with an attenuated AC signal (easily done with an AC wall wart feeding a voltage divider) on the other channel, easy way to get isolation from the mains while preserving waveform accuracy. I'm sure there are better ways nowadays.

author: sougatachakraborty50
author_rank: Newbie
timestamp: August 29, 2020, 04:40:51 am
content: Thanks for your input. But point being, the development and installation will be taken care of by different members of my group. I am just searching for a simulation software (if anything better than Simulink) to model the entire system.

author: NiHaoMike
author_rank: Super Contributor
timestamp: August 29, 2020, 05:10:31 am
content: If you have the data, you can just use a Python script to calculate what the system does at various points in time. Consider it as an energy in vs energy out problem. Where things get a bit open ended is that in many cases, the end user can greatly reduce the cost of the system by rescheduling loads.

author: max_torque
author_rank: Super Contributor
timestamp: August 29, 2020, 12:43:13 pm
content: If you have Mathworks Simulink, then use it!It is "industry standard" across a huge range of sciences. The only reason not to use it, is cost (non student licences are quite expensive)
Simulik Help - Page 1
Forum section: electronics / projects

author: ydayi
author_rank: Newbie
timestamp: May 11, 2018, 07:49:45 am
content: i need some help about my project. There are some problems that i cant solve in simulink. Anybody help me?yigit.dayi@sesa.com.tr

author: Nitrousoxide
author_rank: Regular Contributor
timestamp: May 12, 2018, 11:46:51 am
content: Perhaps post the problems here?I'm sure if you post the question here, you will get ample responses.
Independent line-out and headphone output volume control - Page 1
Forum section: electronics / projects

author: dingari
author_rank: Contributor
timestamp: September 15, 2016, 04:20:38 pm
content: Hi, I'm currently working on a project that will include both line-level audio and headphone output. The source has only two channels (left, right) at line-level which will be available to both line-out and headphone-out.Both will be active at the same time (simultaneous operation), and I want independent volume control between the two. The best solution I've come up with is to use a digitally controlled (I2C, SPI) headphone amp IC (since I need to include a headphone amp anyawy), and find a way to easily control the line-out volume (preferrably I2C, SPI). I've been looking at PGA and VGA (Programmable/Variable Gain Amplifier) ICs.This must have been done before. What is the best / most common way to achieve this? Are there specific ICs that are more frequently used than others?TL;DR: I have a single line-level source (left, right channels), and need to feed that to line-out and headphone jacks, with independent volume control between the two.

author: Richard Crowley
author_rank: Super Contributor
timestamp: September 15, 2016, 04:54:33 pm
content: Here are two possibilities. Quite low-cost and good performance.But apparently available in small quantities only from Futurlec.http://www.futurlec.com/Others/PT2253Apr.shtmlhttp://www.futurlec.com/Others/PT2258pr.shtml

author: jeroen79
author_rank: Frequent Contributor
timestamp: September 16, 2016, 01:11:25 pm
content: Simply send the line in to a buffer.Then the output of this buffer can be sent to an amplifier with it's own volumepot.The buffer's output can also act as a line out.If you want the line out to be variable as well then you can add another buffer with it's own volume control.
Sine wave inverters: which failure modes? - Page 1
Forum section: electronics / projects

author: mcinque
author_rank: Unknown
timestamp: September 06, 2022, 11:49:03 am
content: Let's take an online, pure sinewave UPS, so an inverter working all the time the UPS is on.As far I understand, an online UPS is basically two things, a charger and an inverter.AC mains is rectified and used to charge UPS batteries. Then the power from the batteres goes thru an inverter (H bridge and signal processing) and reach the device to be powered.If AC mains fails, the inverter will continue to work until the batteries keep a certain voltage.But what's the common way an inverter may fail? Overvoltage? Undervoltage? Let's assume signal processing fails or some component of the H bridge fails, or the PWM fails. What could happen, catastophically?I expect:Square or distorted wave instead sine (signal processing fail)Incorrect frequency (not 50/60Hz)Overvoltage or undervoltage (PWM fail)DC outputWhat do you expect? And what are the typical failure modes of this devices in your opinion?

author: Siwastaja
author_rank: Super Contributor
timestamp: September 06, 2022, 12:07:27 pm
content: Poor design causing some semiconductor switch to go BOOM and short circuit, rendering the thing totally inoperable, possibly triggered by some weird edge condition, or just aging / random failure.Temperature/aging related wear of poorly dimensioned parts (such as electrolytic capacitors).
Sine Waving into the New Year!  - Page 1
Forum section: electronics / projects

author: EmbeddedEric
author_rank: Contributor
timestamp: January 02, 2012, 06:02:04 pm
content: Sine Waving into the New Year!Postby embeddederic » Mon Jan 02, 2012 12:53 pmI have been slowly reading through Jim Williams "Analog Circuit Design" book. Not slowly because it is boring, it is actually very interesting and a good read; I just get easily distracted and it has been a few weeks since I picked it up. I am about 200 pages or so into it and my favorite chapter so far has been the one where Jim Williams describes the steps he took while recreating William Hewlett's Model 200A Wien Bridge Oscillator. It is essentially the same project described in Linear Tech's AN43 Appnote, but with a lot more background and Jim describes the inner workings very conversationally in the book.Jim's first iteration of the circuit consisted of a RC Wien Bridge, an LT1037 Opamp and a #327 Lamp. The Lamp is used as a variable resistor that starts out at a very low 98 Ohms DC resistance that helps get the Opamp oscillating (because of the increased gain) and ends up stabilizing at around 235 Ohms once it heats up (thus servo-ing the gain down to an equilibrium point that keeps the circuit oscillating).I thought this would be a fun circuit to build up and recreate.There is more detail about this project on my blog.http://embeddederic.blogspot.com/2012/01/sine-waving-into-new-year.html
Sinewave with adjustable amplitude? - Page 1
Forum section: electronics / projects

author: BiOzZ
author_rank: Regular Contributor
timestamp: November 18, 2013, 11:02:47 pm
content: Im working on a DDS project and im using it to make 2 DC biased square waves (one inverted one ... verted? XP) at an adjustable duty cycle and 2-15v output and im using a AD9850 module that has a sine wave output ... i have the square wave part finished and working BUT i dont want the sinewave part to go to wastei know im probably asking for electronic voodoo here but is there a way to simply amplify the sinewave (thats 1.2v p-p DC biased) to have the amplitude adjustable WITHOUT using a complicated attenuator circuit with all sorts of relays and sizable stuff in a small size? im working from 1hz to 25mhz and i have some 250mhz opamps on hand i can useif i cant i will simply throw in a class B amp with a fixed 5v out but i would like to use this!

author: c4757p
author_rank: Super Contributor
timestamp: November 18, 2013, 11:07:15 pm
content: Analog multiplier/variable gain amplifier. Or just use a damn pot...

author: BiOzZ
author_rank: Regular Contributor
timestamp: November 18, 2013, 11:20:22 pm
content: Quote from: c4757p on November 18, 2013, 11:07:15 pmi may have skipped over the fact that i need the only adjustment to be the variable power supplies current voltage adding on a second pot for just the sine wave amplitude adjustments would be rather silly
Single 0.1" receptacle / connector - Page 1
Forum section: electronics / projects

author: SpencerTC
author_rank: Contributor
timestamp: March 02, 2020, 05:15:26 pm
content: I'm trying to find a high quality (3M, Mill-Max, etc..) connector, but don't know how to describe it correctly when searching and could use some help both with the correct descriptor to use as well as your personal experience as to the 'best' connector.What I'm looking for is 0.1" pin connectors, both female and male, in order in order to make some jumpers that are more along the lines of the quality on HP logic analyzers instead of the import quality that is often shipped with breadboards, or dev boards from import sources.In an effort to be more clear, below are a couple examples (examples of female connectors, as I have noticed a much greater difference in quality in those)GOOD example:BAD example:

author: MLXXXp
author_rank: Frequent Contributor
timestamp: March 02, 2020, 05:29:53 pm
content: The "bad example" ones are generally called Dupont connectors.

author: thm_w
author_rank: Super Contributor
timestamp: March 03, 2020, 01:25:29 am
content: The dslogic cables are essentially off the shelf parts, but yes much nicer cable than the cheapies.Is it worth your time to crimp yourself? Crimper ~$20, some nice wire (teflon, silicone, etc.), terminals, and heatshrink should be <$50.digikey has some stuff but, its just PVC so doesnt look greathttps://www.digikey.ca/product-detail/en/e-z-hook/9110-12-S/461-1141-ND/573964https://www.digikey.ca/product-detail/en/3m/924966-C/924966-ND/4097https://www.digikey.ca/product-detail/en/pomona-electronics/5948/501-1631-ND/737515
Single board computer with LVDS - Page 1
Forum section: electronics / projects

author: Rachie5272
author_rank: Regular Contributor
timestamp: June 11, 2016, 05:58:55 pm
content: I have a dream of making my own laptop. It doesn't seem too far fetched these days, with single board computers. The only trouble is I can't seem to find anything which will output directly to an LCD through LVDS or similar protocol. Everything is made for HDMI, and using an adaptor needlessly adds bulk.Does anyone know of a single board computer which would be suitable for making a laptop?

author: uncle_bob
author_rank: Unknown
timestamp: June 11, 2016, 07:42:04 pm
content: HiTake a look at the ST "discovery" boards. Most of them come with an LCD display.Bob

author: ConKbot
author_rank: Super Contributor
timestamp: June 11, 2016, 07:58:22 pm
content: http://hackerboards.com/ringing-in-2016-with-64-open-spec-hacker-friendly-sbcs/seems relevant. Also, keep embedded display port (edp) as an option. Adafruit has a kit to adapt a normal display port to a edp connection for a 9" ipad LCD. (and being a retina, it's no slouch in resolution) I'm sure other LCD panels could be found with edp also.

author: grimmjaw
author_rank: Regular Contributor
timestamp: June 12, 2016, 12:02:53 am
content: Riot Board has LVDS on board

author: viperidae
author_rank: Frequent Contributor
timestamp: June 12, 2016, 12:17:54 am
content: The old cubie board 2 has lvds. It's only powered by an allwinner a20 though

author: daqq
author_rank: Super Contributor
timestamp: June 12, 2016, 10:32:55 am
content: Search for Novena - the open source lap top. Also toradex has some fairly powerful small modules:https://www.toradex.com/computer-on-modules/apalis-arm-family/nvidia-tegra-k1
Single cell 18650 charging module at 12, which can run as UPS? - Page 1
Forum section: electronics / projects

author: nardev
author_rank: Unknown
timestamp: February 16, 2024, 09:34:05 pm
content: Hey guys, i'm looking for a single cell module for 18650 battery which can also be used as UPS and that charges at 12V, outputs 3-5V.I looked at those from Aliexpress, seems like most of those are charging at 5V only.Do you have any suggestion? I really need it to be a module, preferably with battery holder but not a full size charger.

author: Eric_zhang
author_rank: Newbie
timestamp: April 13, 2024, 05:12:29 pm
content: Hey there,I came across your post about looking for a single-cell 18650 charging module that can function as a UPS and charges at 12V with a 3-5V output. It seems like you've been searching for a while, and I think I might have a solution for you.At [company name removed], we specialize in creating custom battery holders and charging modules. We can provide you with a 18650 battery seat that's designed to meet your specific requirements. Our battery holders are built to ensure a secure and reliable connection, and we can work with you to integrate them with a charging module that fits your 12V charging and 3-5V output needs.We understand the importance of having a UPS function, especially for applications where power reliability is crucial. Our products are engineered to provide just that, and we're confident we can deliver a solution that will work seamlessly for your project.If you're interested in discussing this further, please feel free to reach out. We'd be more than happy to talk through the details and see how we can tailor our offerings to your exact specifications.Looking forward to potentially collaborating!Best regards,[Spam links/company name removed]
Single cell LiPo protection IC - Page 1
Forum section: electronics / projects

author: ppTRN
author_rank: Regular Contributor
timestamp: November 22, 2022, 04:38:43 pm
content: Hi, I am designing a circuit using a SIM808, a gsm & gps module with built-in lipo charging circuit. The datasheet states tho that an external circuit for battery protection is needed. I tried to contact SIMcom about wich IC is suggested, but they didn't reply. Browsing the web I found a particular part wich i think is suitable for the job, an R5486K. What do you guys think? Has everyone ever used such IC?

author: MLXXXp
author_rank: Frequent Contributor
timestamp: November 23, 2022, 09:28:22 pm
content: The one you found is very similar to the DW01-P commonly used.https://cdn.sparkfun.com/assets/learn_tutorials/2/5/1/DW01-P_DataSheet_V10.pdfAlso note that many LiPo cells have a circuit such as this built in.

author: thm_w
author_rank: Super Contributor
timestamp: November 23, 2022, 10:26:27 pm
content: Just buy a protected cell, don't make things complicated.

author: Tjuurko
author_rank: Regular Contributor
timestamp: November 24, 2022, 09:16:01 am
content: https://datasheet.lcsc.com/szlcsc/2006240933_XySemi-XB7608A_C669688.pdfOne Cell Lithium-ion/Polymer Battery Protection IC

author: ppTRN
author_rank: Regular Contributor
timestamp: November 24, 2022, 04:14:30 pm
content: Thank you all. I guess I'm going for an internally protected cell. I didn't know they were available. Have a nice day!
Single ended mono input to stereo amplifier? - Page 1
Forum section: electronics / projects

author: Starlord
author_rank: Frequent Contributor
timestamp: January 08, 2018, 08:13:56 am
content: Hello,I want to have a single-ended mono input to this amplifier:https://datasheets.maximintegrated.com/en/ds/MAX98306.pdfBut there's two things I'm not sure about.My first question is:Why do both of these TI amplifiers connect the single ended input to the - side of the... op amp? and ground the + side?And does it make a difference which side I connect my input to, and which side I ground?http://www.ti.com/lit/ds/symlink/tpa6211a1.pdfhttp://www.ti.com/lit/ds/symlink/tpa2012d2.pdfFrom this Adafruit tutorial for a breakout they offer, it doesn't seem to matter, as they have grounded the - sides for the single ended input example, but then, it doesn't make sense why TI would choose to ground the + side if they could pick either one.https://learn.adafruit.com/stereo-3-7w-class-d-audio-amplifier/inputs-and-outputsAnd my second question is, do I need four capacitors here, or could I have one capacitor for the single ended input to both left and right channels (let's say the - side), and another capacitor to ground, which is connected to the opposite input (+ in this example) for the left and right channels?

author: Zero999
author_rank: Super Contributor
timestamp: January 08, 2018, 10:46:06 am
content: Those are not operational amplifiers.They all have a fixed (other than the TPA6211A1, which can be set by varying the input resistors) relatively low gain, compared to an op-amp, and automatically bias the output at an average of half the supply voltage, thus eliminating the need for additional resistors.The TPA6211A1 and TPA2012D2 don't need any input capacitors, if the inputs are both within 0.5V andDD-0.8V (this is the common mode range), otherwise, use input capacitors and allow the inputs to bias themselves.The MAX98306 need input capacitors, otherwise it will upset the internal biasing.Because the inputs to the amplifiers are differential, either input can be ground or signal, the only difference is, if the signal is at the inverting input it'll be inverted.If you want to connect a stereo amplifier, to a mono source, just connect both the inverting and non-inverting inputs together (no capacitors) and then connect one to ground and one to the signal, each via a suitable capacitor.
single eye iphone display? - Page 1
Forum section: electronics / projects

author: coppercone2
author_rank: Super Contributor
timestamp: April 03, 2024, 09:21:02 pm
content: Is there anything like a small LCD screen on a stick for a single eye so you can look up or whatever and see a mirror of your phones screen ?I.e. to have schematics up while working in a box or something like thatI don't mean translucent, I mean like a car mirror you mount to your head, but its a display.
Single "high voltage" Operational Amplifier in 8 pin package compatibility list - Page 1
Forum section: electronics / projects

author: notadave
author_rank: Contributor
timestamp: August 23, 2024, 08:41:58 pm
content: List of pin compatible *741 replacement single OpAmp with 30V to 36V in 8 pin package.LT1007LT1037LT1128MC1439NE5534SA5534OPA111OPA121AD795UA741LM741LM709LM748LM201LF411LF356OP07OP27OP37TLV07TL971TL061TL071TL081

author: coppercone2
author_rank: Super Contributor
timestamp: August 23, 2024, 08:44:02 pm
content: hopefully*
Single IC for Power Line Communication? - Page 1
Forum section: electronics / projects

author: emqx
author_rank: Newbie
timestamp: June 28, 2019, 05:48:57 pm
content: I am looking for a simple single integrated-circuit solution for home automation (primarily, switching of lights and ACs and, dimmer control for fan).What I need is a single IC transceiver (line-driver + modem + controller) that can directly interface with 230V AC line.The key retirement is that each PCB should be small enough to fit in sockets and switches and low cost and BOM.Is there any product available out there?

author: aldi
author_rank: Contributor
timestamp: June 28, 2019, 06:11:44 pm
content: Maybe KNX:https://www.st.com/content/st_com/en/products/interfaces-and-transceivers/power-line-transceivers/stknx.html#quality-reliabilityPriced at €3,21 (quantity 10) :https://octopart.com/search?q=STKNX

author: erikka
author_rank: Regular Contributor
timestamp: June 28, 2019, 08:01:06 pm
content: KNX is max 45volt. Not sure that is sufficient for connection to mains

author: SiliconWizard
author_rank: Super Contributor
timestamp: June 29, 2019, 01:26:18 pm
content: Look up "Power Line Communication".A couple examples:https://www.st.com/en/applications/connectivity/power-line-communication.htmlhttps://www.maximintegrated.com/en/products/comms/powerline-communications/MAX79356.html
Single LED clock - Page 1
Forum section: electronics / projects

author: johnboxall
author_rank: Unknown
timestamp: August 06, 2010, 03:39:39 am
content: I was bored the other week and came up with a design for a blinking clock. It used a single RGB LED to blink out the hours and minutes using different colours. Details are here:http://bit.ly/aG4QZz.

author: lamja
author_rank: Contributor
timestamp: August 07, 2010, 11:50:45 am
content: Cool. I2C and everything...I did also buy a bounch of Atmegas with Arduino boot.QuoteLOLNice work.

author: johnboxall
author_rank: Unknown
timestamp: August 07, 2010, 11:59:31 am
content: Thank you. The next clock will be the complete opposite: 8x8 LED matrix, menu systems, buzzer, temperature, complete madness...
Single phase ac dc rectifier buck converter  - Page 1
Forum section: electronics / projects

author: LuizAnghel
author_rank: Newbie
timestamp: September 12, 2018, 12:15:29 am
content: Hi, this is my first post here on the eevblog forumI want to build a single phase buck converter, with single phase i mean it can handle either line-neutral voltage ( 127 V) or line-line voltage (220V). The thing is that i dont want to use a transformer, i want to do something like this. (ignore the values, just for demostration)My questions about this isHow can i control the IGBT/Mosfet that way? im confused since idk if its high side or low side switching.Is this an effective way of doing an AC-DC buck rectifier? or is not that good at all? (with good i mean if it is efficient)would it be better if instead of the diodes i use thyristors?

author: xavier60
author_rank: Super Contributor
timestamp: September 12, 2018, 02:56:52 am
content: I don't have all of the answers. C2 must not be there.I made a low voltage Buck converter with the control IC referenced to a MOSFET's Source which was also the switching node. Meaning that the whole control circuit was live with the switching waveform. The circuit ended up working well but it was very difficult to refine because I couldn't easily observe waveforms within the control circuit. It's best the reference the control circuit to ground.A high side driver IC would be difficult to make work there because the switching node needs to be actively pulled to ground to charge the bootstrap capacitor, unless there is some work around.A drive transformer could be used but it can be tricky getting a varying duty cycle waveform properly to the Gate unless a quasi square wave is used which stays symmetrical. There are all sorts of other Gate dive transformer tricks out there.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: September 12, 2018, 07:06:47 pm
content: C1 and C3 will not be as large either.Add a current sense resistor in the ground return path, between D5 and C3. Use a high side or isolated gate driver to run the transistor. Then you can use any buck or forward controller. TL494 is an old example. You will most likely use an average current mode control scheme, which is well suited to the large inductor value shown.You will need an oscilloscope with isolated channels to diagnose this circuit.I strongly recommend you gain experience with a "toy" version first, say at 12V and 5A or somewhere around there, before attempting anything at mains voltage, let alone connected to hazardous mains voltage outright.Tim
Single phase induction motor - is this wiring right? - Page 1
Forum section: electronics / projects

author: peter-h
author_rank: Super Contributor
timestamp: January 09, 2025, 04:19:54 pm
content: Motor wires are on the left; the mains cable is on the right.It does run, but with a low torque.It is an air blower motor, like this sort of thing:https://www.ebay.co.uk/itm/184143346753It used to have a manual speed controller on it but that blew up so I rewired it to run without. That was a few years ago but for complicated reasons it has just become apparent that it is running at a much lower power.I've been googling on chinese motor wiring but cannot find an example with these colours. I suspect that the white and red go to winding ends (they can hardly go anywhere else) and these windings are in series so the motor is running at a reduced current. There is obviously also a starting capacitor.The reason for the blue and black being joined is another mystery.I think the reason the motor has the three extra wires (red, white, and one of the black and blue) is to support a primitive high speed / low speed. The controller was a triac based one like is used for lamps and it only barely works with an induction motor, but it did partially slow it down.Now I just want the maximum possible power.

author: BennoG
author_rank: Frequent Contributor
timestamp: January 09, 2025, 05:34:05 pm
content: measure resistance between all wires and draw how the capacitor is connected.Benno

author: peter-h
author_rank: Super Contributor
timestamp: January 09, 2025, 08:19:31 pm
content: I found the exact motor :https://www.psp.uk.com/wp-content/uploads/2014/08/105SM75R.pdfThere is no way to connect it for more power.I am going to replace this £600 blower with this onehttps://www.ebay.co.uk/itm/156126618688which is much more powerful and is a fraction of the cost

author: ajb
author_rank: Super Contributor
timestamp: January 09, 2025, 08:28:24 pm
content: How is your capacitor connected? I think most of those blowers are PSC motors, so it would be a run cap rather than a start cap. From the linked PDF, it looks like your white and red wires should connect across the cap rather than to each other, assuming your white wire should be yellow.

author: peter-h
author_rank: Super Contributor
timestamp: January 09, 2025, 08:53:25 pm
content: That PDF does not show any white wire... so it can't be right. The chinese do change wire colours (I buy cables from there in production qty) as it suits them... perhaps yellow became white?But it does seem clear that there is no way to make this thing go faster.Unless as you suggest the capacitor is used to run the motor (there is no relay; the cap is always in-circuit) in which case a loss of capacitance would make it go weak. I have just replaced a start cap on a big single phase water pump; it would (mostly) not start, and the cap was down to about 1/3 of its value.I think I need to cut my losses and buy the "400W" fan. If it is too powerful I can always put a capacitor in series with itEDIT: the capacitor measures at 1.3uF. It is marked 5uFI had a 4uF motor cap laying around so put that in. It now runs a lot better!
Single Point to Multi Point Communication  - Page 1
Forum section: electronics / projects

author: zero0d
author_rank: Contributor
timestamp: March 19, 2021, 11:42:18 am
content: Dear All,i'm looking to design a single point to multi point communication with single wire referenced to GND ( fly-by ( daisy chain) or tree (star) ) that works if possible with 1MHz.Did somebody tried to build this and has a suggestion?I think it would be great if we have a line or cable driver on booth host side and slave side, but i'm not Shure if this kind of IC exists ?Also what do you think it is better to go with DC or AC coupled ?The signal that will be transmitted from host to slave is PWM like signal but can have pause between the 1MHz burst eg. __|▔|_|▔|_|▔|_______|▔|_|▔|_|▔|__Best Regards.
Single port battery pack - Page 1
Forum section: electronics / projects

author: Dajgoro
author_rank: Frequent Contributor
timestamp: October 14, 2015, 12:29:34 am
content: Hi.I've been asked to make a custom battery pack with a single usb port(very specific, no way around it), which serves for charging and discharging.I was trying to find if there are any IC that would do this exact thing, but I could not find any.Years ago I had to do something similar, but there I figured I could just put four NiCd batteries in series which is not a proper solution in any case.Somehow I have the feeling there is not such an IC, and I will have to come up with my own solution.
Single-Shot Auto-Charge Flash circuit - Page 1
Forum section: electronics / projects

author: 4beowulf7
author_rank: Newbie
timestamp: July 31, 2015, 07:51:03 am
content: Hi!I've designed a Single-Shot Auto-Charge Flash circuit. Here is more info:https://tr.scribd.com/doc/272583803/Single-Shot-Auto-Charge-Flash-CircuitGreetings

author: dany-boy
author_rank: Contributor
timestamp: November 02, 2015, 02:55:45 pm
content: Hi!Nice simple circuit, do you know the winding ratio for the trigger transformer? I've heard that the xenon flash needs a burst of a couple of KV to fire, so I'm assuming the trigger transformer should be about 1 to 10? I've already got my HV capacitor charging circuit so no need to worry about that one. Thanks!
single supply unity gain amplifier - Page 1
Forum section: electronics / projects

author: texane
author_rank: Regular Contributor
timestamp: March 17, 2014, 08:56:50 am
content: Hi,I am designing a circuit that measures the voltage of a DC load. This voltagecan be up to 12V, and I need to divide it by 4 so that an ADC can handle it. Also,I want to minimize the current drawn for the measure.To do so, I plan divide the voltage using a resistor divider with large values, andfeed the divided voltage to a single supply unity gain amplifier. I will power theamplifier using a regulated 4V supply. I expect the amplifier to behave correctlyin [ 0V - 3V ], and up to a few KHz.I am not used to choose amplifier ICs. Do you know an amplifier that would fit ?This is for a home project, and I would spend up to 3$ in the amplifier (qtity 5).Any advice and help is welcome !Cheers,

author: poorchava
author_rank: Super Contributor
timestamp: March 17, 2014, 09:47:07 am
content: The basic approach is ok, but there is one thing: a rail to rail opamp powered from 5V ang GND will NEVER to down to GND on the output, most will also have reduced performance near rail potentials. I would try to shift the voltage up by 0.1-0.2V or something and digitally subtract that later.For a cheap r2r opamp MCP6051/2/4 seems ok. It also has high input impedances (datasheet states 10^12 Ohms). They have quite poor GBP of 385KHz, but that's fine in your application.

author: texane
author_rank: Regular Contributor
timestamp: March 17, 2014, 10:18:55 am
content: Thanks you for the answer.Do you know a circuit that would offset the measured voltage(mostly DC) ? Otherwise, I think the best solution is to forgetabout single supply ...Thanks,