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HarryA

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1. Need help with using a transistor or triac as a switch

Lets see if this is readable. Using a 2n2222 - about 10 cents apiece. Current from the source is 40ma with a base resistor of 1000 or 10k. In the view the yellow trace is the current through the relay; scale on the right . Green is the voltage at the base; scale on the left. I have no idea what the inductance would be so I set it at 0.001 henry.
2. About the "50V – 10A BIDIRECTIONAL DC MOTOR DRIVER USING A3941" issue

from: http://static6.arrow.com/aropdfconversion/ee14f7b4a3764f5a2d5bf5d73381b76d11c173d/3a3941-datasheet.pdf.pdf
3. Circuito (Medición de variables)

Medición de variables electricas modelo #2 (Measurement of electric variables model # 2) ¿Qué es el modelo # 2? (What is model #2 ?)
4. Phase Dimmer Control using Triac

I believe your circuit is not quite correct. The resistor and capacitor (C1 and R3 ?) belong to the DIAC not the TRIAC. see the circuit here: https://www.electronicshub.org/simple-fan-regulator-circuit/
5. Sine wave frequency multiplier

That is a good idea but how do you get the divide by 2.7 required ? Is the best one can do is to divide by 5 then by 2 or 10 and 4 for 2.5 perhaps. There is a good phase locked loop frequency multiplier tutorial at: www.youtube.com/watch?v=5by0os8RrFY
6. Sine wave frequency multiplier

The only way I can think of to do that is to use two circuits. First a frequency to voltage converter circuit. Then feed the voltage output of that circuit into a voltage to frequency converter circuit. One can find such circuits by searching on the internet. A circuit simulator would be helpful here. The 9400 chip can be used as a voltage-to-frequency or frequency-to-voltage converter. Perhaps there is a newer chip? Hopefully someone else will have a better idea for you 😐
7. Ratio Detector

The vertical green line supplies current to the transistor. The other part of the green line supplies current to the detector which modulates it to form the audio and afc outputs.
8. spam prevention?

On my forum if you replace http: and keto one can at least alert guests not to click on the links and that may help. At least it is not difficult to implement. from my forum (note spaces around SPAM and SPAMMER - helps them stand out): Put the word to be censored on the left, and what to change it to on the right. http: => SPAM KETO => SPAMMER given: http://www.badguy.com => SPAM //www.badguy.com this is keto crap => this is SPAMMER crap Members posting url's in a post would learn to use the short version without the http: www.rcgroups.com Is spam the correct word or does that only apply to emails?
9. UPS MGE PULSAR ESV 22+

You could ask for help finding a schematic here - maybe helpful: http://www.fixya.com/support/p143760-mge_pulsar_evolution_2200_esv22_ups Good luck.
10. UPS MGE PULSAR ESV 22+

the manual is here if that is helpful: https://www.manualslib.com/products/Mge-Ups-Systems-Pulsar-Esv-22Plusrack-1938198.html
11. spam prevention?

If you open the register page and right click on the page and select "view page source" you see the html code that makes that page. If you search on that code for: "form_q_and_a" you will find the block of code that renders that area on the page.(in firefox search by ctrl+ f) and that contains your question. If one is comfortable with working with files on the server one can find the file that contains the "form_q_and_a" string. then download it to your pc and replace the text string with an image ( jpg or png file ) of the text in mixed colors and fonts. If you don't have the tools to create such a file I do. You may not see you text string in that file as it maybe added in at run time. In my first forum I got to the point that I would register members via an email request myself; they where not allowed to do so. I used their requested user name and assigned them temp.password and that works well if you do not have many request per day. It beats having to clean up the forum everyday.
12. Request help for college project

In the world of electronics what is a "landing deck"? I only know of landing decks on aircraft carriers and at the foot of stairs. I am guessing it is where you "land" your cell phone.

14. HELP with Schematics for magnet launcher

To start with those capacitors are 4700 microfarads (not 4.7) at 400 volts, not cheap. The resistors are 50 watt resistors. I would think the yellow leads on your transformers are taps, here unused. If you connect two of the output black wires together and measure the voltage across the other two you should get 220 volts rms. If not select a different wire for one of then. You must have at least a inexpensive multi-meter to work with. Beware these are high voltages and those large capacitors hold enough current to do you in!
15. spam prevention?

Something like what is the: "unit of capacitance"a five letter word". It is only a slight inconvenience at most for real people plus they only have to do it once. I set up a forum earlier this year and asked the local padding group if they wanted to use it but they decline. I did not do anything with it for a few months until I got an error message via an email. When I looked at it I had 6800 members, 90% were Russian. As I could only delete 30 members at a time it took awhile to get rid of them.
16. spam prevention?

I think your registering question is weak. I would ask a question that requires a Yahoo search. Perhaps the spam computers could not do that. Like what is Pi to the 6th decimal place?
17. spam prevention?

Why don't you all use the spam prevention tools? https://invisioncommunity.com/features/spam/ On my forum one must answer a question that any kayak or canoe paddler would know to register. Got read of the damn Russians!
18. 12v 3000w inverter repair help

Without a circuit diagram it is very difficult to help you. You can find numerous videos on youtube.com related to "EGS002 " that maybe helpful. Good luck. Looks like I was born under the sign -V (I talk to much?)
19. Help Required -Timing System RS232 to Analog Conversion

Hello, You could use a rs232 to ttl converter that you could connect to an Arduino microprocessor, You can get the converter for 1\$, Arduino from 10\$ to 30\$ depending on the quality you want. Also you need a power supply about 10\$ and a relay about 5\$, Plus connectors. see: https://daverobertson63.wordpress.com/2013/06/02/serial-port-mini-rs232-to-ttl-converter-adaptor-module-board-max3232-with-arduino/ Many of us can help you with the software. I just got a large memory Arduino for 10\$ that I am using for a talking weather station.
20. Ac circuit bta41 self triggering

Your circuit is basically incorrect. The DIAC , labelled TRIAC1, would never carry the load in that type of circuit! Only the gate current for the TRIAC. see the circuit at: https://www.electronicshub.org/simple-fan-regulator-circuit/ for example. Good luck.
21. Help for read MCU HR7P169 ( from my Hot air soldering station )

As only the CPU has access to the flash memory I would think it would not be possible to access the code. If it were on a separate chip you could read it with the right equipment. It may be better to develop your own code rather then try to reverse engineer this device. chip you
22. Need Heaphone/Mic Amp Circuitry

If you look around on ebay or amazon.com for "audio amplifier board 5 volts" you may find something that would be helpful. Like: Icstation PM2038 2X5W stero audio amplifier board 5v USB powered adjustable volume. They are quite inexpensive. https://www.amazon.com/PM2038-2X5W-Stereo-Audio-Amplifier/dp/B01NABJTDJ/ref=sr_1_36?crid=2KDQ8EUT857T7&keywords=audio+amplifier+board+5v&qid=1558736268&s=gateway&sprefix=audio+amplifier+board%2Caps%2C184&sr=8-36 Sorry I can not be more helpful.
23. BMS Charger for 18650

BMS 18650 chargers are quite inexpensive off Ebay if you are not big on rolling your own. https://www.ebay.com/itm/3S-20A-12-6V-Li-ion-Lithium-18650-Battery-Cell-Circuit-BMS-Protection-PCB-Board/122183528602?_trkparms=aid%3D555018%26algo%3DPL.SIM%26ao%3D1%26asc%3D56826%26meid%3D93e40678e3dd4abe9ac93405e5253fca%26pid%3D100005%26rk%3D5%26rkt%3D12%26sd%3D253289010740%26itm%3D122183528602&_trksid=p2047675.c100005.m1851
24. Speed controller for AC Servo Motor - help

If you search on YouTube for " 3 phase electric motor control" you may find some information that maybe helpful.
25. Rc car

Perhaps the chip is over heating with to much current draw? Try connecting only two motors to see what happens. For the l298n chip itself: For the IO Peak Output Current (each Channel) – Non Repetitive (t = 100ms) 3.0A –Repetitive (80% on –20% off; ton = 10ms) 2.5A –DC Operation 2.0A TOTAL DC CURRENT UP TO 4 A
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