[Cooling FAN Controller Using an LM35 (No MCU)]

https://www.pcbway.com/project/shareproject/LM324_Battery_Indicator.html

this is conducting on LM32 to control the controller it will help you in this regard. Complete instrumentation of LM32 is given to control the fan.

[the USB tester]

This link is a TTL to USB converter and it works fine but first please explain what's your product? after knowing the details, I could give you a better response/solution

[Advice Please On this amp design]

Decompensated operational amplifiers have improved noise, slew rate, harmonic distortion, etc., but required external compensation for stable operation. This report shows how to compensate such an amplifier and achieve the performance enhancement it provides in a unity-gain configuration.

[School Project Help.]

the broadest choice of op amps in the industry, delivering unmatched quality, robustness, and performance to enable optimized solutions in automotive, industrial, consumer, and healthcare markets.

check this article

https://www.analog.com/en/products/amplifiers/operational-amplifiers.html

[A motor powered by water.]

this article is also interesting motor power by water, check this out

https://www.lowtechmagazine.com/2013/09/power-from-the-tap-water-motors.html

[How to check CPU Serial Number of pcDuino1/2/3]

thanks fro sharing.. it definitly help me.

[How a Power Quality Meter works and why it is so Important]

very informative . thank you for sharing

 

[555 timer]

thank you it is very help full.

[TL494 half bridge smps]

https://www.pcbway.com/project/shareproject/inverter_12V_To_220V__using_TL494.html

this project clearly show the purpose of 103 tripot and use of 2n222a . hope this will help you finding your question.

[Newbie Circuit Designer]

LTspcie, pspicem Multisim, protius, these are the best simulation software. you can use any of them

 

 

[RLC circuit]

there is no specific information given in the question, what do you want to find or what is given. you only give RLC values which is very useful in find some circuit parameter but havent specified what need to find here?

 

[Amplifier based on mosfet]

Mosfet operate in different region to perform specific operation, but to develop mosfet as an amplifier it should operate in enhancement mode. 

https://www.electronics-tutorials.ws/amplifier/mosfet-amplifier.html#:~:text=MOSFET Amplifier uses a metal,field effect transistors%2C or JFET's.

[power circuit]

The unit of power is not amps. you should use Watt. as far as I understand you question, you want a 100 watt supply with volts vary from 1 to 220 volts. The output power we can calculate by using formula P=VI so you can vary current and volt to get desire output power. To vary current and Voltage you can use transformer.