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Antonio51

 Discussion on question by ShikShoxF1:…

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Antonio51
Mar 2 15:36
I see labels GND, symbols "ground" ... Nothing else.
Antonio51
Mar 2 15:36
Q1 & Q3 have collectors wired to ground ?
 

 Discussion on question by Mahdi Javid…

Imported from a comment discussion on electronics.stackexchang...
Antonio51
Jul 31, 2024 08:35
Are M15-H15 and M16-Q13 wired together? Same for others ...
 

 Discussion on question by Aryan 031: …

Imported from a comment discussion on electronics.stackexchang...
Antonio51
Apr 10, 2024 10:07
here is a simulated waveform made with microcap v12 archive.org/details/mc12cd_202110 i.sstatic.net/mvQ4GUDs.png
Antonio51
Apr 10, 2024 10:07
20 uH - 50 mF should be ok for 25 Hz ... For 100 Hz, capacitor could be divided by 4.
Antonio51
Apr 10, 2024 10:07
Here is my simulation i.sstatic.net/kEIPdvBb.png
Antonio51
Apr 10, 2024 10:07
I tried 20 uH ... with 100 mF // 1.5 Ohm
Antonio51
Apr 10, 2024 10:07
This value is more than simulated with an inductor in series (100 mF) at the lowest frequency (25 Hz).
Antonio51
Apr 10, 2024 10:07
electronics.stackexchange.com/questions/215768/…
Antonio51
Apr 10, 2024 10:07
You aren't finding a formula for smoothing capacitor ... because, in polyphase systems (>2), there is generally an inductor in series with the resistance ... something as 20 uH and 30 mF capacitor paralleled with resistor (1.5 Ohm). Note also that the starting voltage can reach 120 V (10 ms at least) ...
Antonio51
Apr 10, 2024 10:07
What output current ? Triangle or star generators ? RMS or peak voltages ?
 

 Discussion between P-Em and Antonio51

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Antonio51
Nov 30, 2023 10:24
Are you using the file in the answer? If you have well "calibrated" this program, then the unit is "Ampere". Note that I was using it for some kW. You should try with another power bulb (or more bulbs) to see if the readings are ok because when the power is too low, there are some discrepancies. You can also "insert" more turns into the CT. This is a direct multiplicative factor to see if it works. You can then multiply by the voltage to calculate the "apparent power". To know the "real power", you should also measuring the "voltage" simultaneously.
Antonio51
Nov 30, 2023 10:24
@P-Em What last print ? >>>Serial.print(micros()); Serial.print(" ");<<< It is the "time" printing of the processor in microseconds.
Antonio51
Nov 30, 2023 10:24
See the 2 links i already give you for another method.
Antonio51
Nov 30, 2023 10:24
@P-Em Please note that I added example file in answer.
Antonio51
Nov 30, 2023 10:24
It seems that there is no need for a comparator. Note that the "zero point" is the level done with the two equal resistors ... So it should be at 3.3*10k/(10k+10k)=3.3/2=1.65 V.
Antonio51
Nov 30, 2023 10:24
@P-Em Not yet. I am in displacement until very late. github.com/khoih-prog/ESP8266TimerInterrupt paragraph /usage/1.2 Or use ticker circuits4you.com/2018/01/02/esp8266-timer-ticker-example
Antonio51
Nov 30, 2023 10:24
"Under interrupt" I mean working with one timer "task" which would do "automatically" and very fast the sampling and saving it in an array. All others tasks (which include calculus) must be done out of the timer task and only after the timer has computed its task. randomnerdtutorials.com/… arduino.cc/reference/en/libraries/esp8266timerinterrupt
Antonio51
Nov 30, 2023 10:24
I will search "through my applications notes" if I find this peace of program as I did it ... a long time ago. I did it for Atmega328, not for ESP8266.
Antonio51
Nov 30, 2023 10:24
You must absolutely work under interrupt as samples must be really "equidistant". The "for ... loop" is, if I remember well, 4 ms " loop time"without any internal instruction ... It's way too long. Each sample with Arduino takes 140 us.
Antonio51
Nov 30, 2023 10:24
I add in answer.
 

 Discussion on question by arjun.ar: W…

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Antonio51
Feb 10, 2023 15:17
Perhaps because of no bias (Vdc OFF) ...
 

 Discussion on question by matcha: Ach…

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Antonio51
Dec 12, 2022 06:34
@Jonk Right. That is why I suggest a "test" board for "classifying" the LEDs ...
Antonio51
Dec 12, 2022 06:34
To be sure that LEDs are "identical", be sure that they are from the same "batch" production ... or make a "test" board measuring intensity for the same current to "classify" it.
 

 Discussion on question by grandzello:…

Imported from a comment discussion on electronics.stackexchang...
Antonio51
Nov 19, 2022 02:05
Are you sure also that U1 and U2 are working in the "right" DC range as power supply is unipolar? Are you sure of the "position" of R10, R11, R14, R15?
Antonio51
Nov 19, 2022 02:05
The problem could sit in your input op-amp. What are the specs of your sensor (temp range) and output opamp U3 (Vmin, Vmax)?
Antonio51
Nov 19, 2022 02:05
Ok. Not rail to rail? Check if this is necessary.
Antonio51
Nov 19, 2022 02:05
Are you using "decoupling" capacitors on each op-amp?
 

 Discussion on question by Jeppe Holt:…

Imported from a comment discussion on electronics.stackexchang...
Antonio51
Nov 4, 2022 18:52
If you use S26 plug, remember you can change the software it has. I use Espeasy letscontrolit.com/wiki/index.php/ESPEasy . Very well documented. plugs are accessible through HTTP directly or via software written with whatever program you want. I use these plugs via Domoticz software.
Antonio51
Nov 4, 2022 16:20
@Justme Right. I was thinking about these cases.
Antonio51
Nov 4, 2022 16:20
@JeppeHolt I suggest you use some plug ... WiFi already "wired". So you don't need "modifying" timer plug unless you need a timer. See this : sonoff.tech/product/smart-plugs/s26
Antonio51
Nov 4, 2022 16:20
I deleted my comment, Ok. @Justme Right. ... The mains at home and at university is not probably the same "model". Perhaps a star or triangle system with or without neutral (wired left or right in the plug?).
Antonio51
Nov 4, 2022 16:20
Did you use optocouplers?
 

 Discussion on question by EmeraldMonk…

Imported from a comment discussion on electronics.stackexchang...
Antonio51
Nov 2, 2022 14:50
If you test one driver at one time only, 1) wire a resistor (1k or a little less) between Vs output and +12V. Low level on Hin ... High/ Low level on LIN will set ON/OFF Q5 -> output is low/high. Then, 2)Wire the resistor between Vs and ground. Low level on LIn set Q5 off. Wire pulse on Hlin, Vs should pulse high and low. NB: you can wire the two resistors and left there.
Antonio51
Nov 2, 2022 14:50
You said "10 Vp-p square wave input on Hin and Lin" ? On the same half bridge ... ie on the same IRS2108 ?
Antonio51
Nov 2, 2022 14:50
Note that this kind of driver needs PWM for High MOSFETs to work (Hin inputs). Generally a stable level of LIN (high or low), a PWM on Hin. Be aware not to set at the same level the two half of the bridge ...
 

 Discussion on question by user16307: …

Imported from a comment discussion on electronics.stackexchang...
Antonio51
Oct 18, 2022 20:35
Ok. Will try it.
Antonio51
Oct 18, 2022 19:37
Ok. Sorry that does not help.
Antonio51
Oct 18, 2022 19:37
Do you need something as this? geozondas.com/product.php?pusl=1
Antonio51
Oct 18, 2022 19:37
Could be this interesting pic-microcontroller.com/wp-content/uploads/2016/06/…
Antonio51
Oct 18, 2022 19:37
NB: if am not wrong, MEXTRAM models 'avalanche' breakdown.
Antonio51
Oct 18, 2022 19:37
I remember one can purchase bjt designed for avalanche (more costly).
Antonio51
Oct 18, 2022 19:37
Confirmed. All the "avalanche" files do no work... I don't use enough LTSpice to "correct" something. :-(
Antonio51
Oct 18, 2022 19:37
have you searched this ... bordodynov.ltwiki.org There is somewhere a "model" for avalanche transistor mmbt2369 (?)
 

 Discussion on question by Luke__: Ope…

Imported from a comment discussion on electronics.stackexchang...
Antonio51
Oct 9, 2022 15:41
Ok. I did not understand what you needs. As pointed out by @Andyaka, in other words, do you need a "regulation" system that can supply Peltier elements with a current need of 8 A under 18 V ? So, you need 2 things... A power supply (~ 150 W) ... and a regulation circuit (I guess the sensor is ... PT100 or something else).
Antonio51
Oct 9, 2022 15:36
Will add an example later ... difficult to show a simulation in road displacement ...🙂
Antonio51
Oct 9, 2022 15:36
Just use a emitter resistor as current feedback to reduce "current gain factor" ...
Antonio51
Oct 9, 2022 15:36
Hum... you spoke about 1A to 8A?
Antonio51
Oct 9, 2022 15:36
Just need beta factor and i think it is greater than 8.NB: ic is 1A max?
Antonio51
Oct 9, 2022 15:36
Have TIP47 an ib current of 1A min? Then yes. Can't check for now. Seems ib= .6A max.