1. J

    Monostable multivibrator BJT

    Hello, I'm a computer science student and I was assigned by my professor to make a monostable multivibrator circuit on a bread board with an unstable duration of three seconds. Keep in mind I have very little knowledge about circuitry, we were only given the schematic and were told to find the...
  2. Younes Thabet

    What should be the readings on DMM when testing a transistor ?

    Hello all, I have read some articles on how to test a transistor with DMM diode mode and what I understand is that measuring from Base (red probe) to Collector\Emitter (black probe) should give a reading and all other probings (C-to-E, E-to-C, C-to-B, E-to-B) should give O.L. But that isn't...
  3. A

    2SC4488 NPN Transistor for SPICE

    Hi there! I am currently looking for 2SA1708 and 2SC4488 transistor models to integrate into Spice, but I could not find any model on the web. Could you please help me if you have the related models? Or can you please give me feedback about what parameters are the most important ones to model...
  4. S

    Can someone help me please!!!? IRFZ44n MOSFET heats up driving TEC Peltier

    Hello everyone, I would really appreciate if you could help me Im making a mini fridge controller (PID), using a 4n25 optocoupler, an IRFZ44n Mosfet and a tec peltier I connect it to a 12v and 3 A and arduino 5v As soon as the arduino code is uploaded and I connect it, the mosfet starts to...
  5. J

    Using Transistor Optocoupler for level shifting

    Hi Im using a NPN Transistor output Optocoupler (Toshiba TLP290) as a level shifter. I have a source squarewave and a constant current chip (20mA) in series to drive the Optocouplers internal LED. The idea is that the constant current chip will allow the optocoupler to be safely and...
  6. babaliaris

    I made my first amplifier!

    We kinda learned about this circuit in the electronics 1 lab, but I don't understand everything, i have some questions and unfortunatly my lab professor is quite a Karen and won't even hear my questions... Anyway, these are my questions: 1) Which elements can I mess with to increase the volume...
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