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  1. Arouse1973

    How to increase frequency from 50Hz to 100kHz?

    Hello Can you post any type of circuit diagram you have showing us what you have already done. Thanks Adam
  2. Arouse1973

    How to increase frequency from 50Hz to 100kHz?

    Why do you need to do this using the mains frequency. What is the end project? Thanks Adam
  3. Arouse1973

    Hi there

    Hello Liam, welcome to EP Adam
  4. Arouse1973

    AC Voltage Amplifier

    Why have you changed from what looked like a working circuit using the BJT. And is your professor going to buy one of those op-amps at over $400 each? :) Thanks Adam
  5. Arouse1973

    AC Voltage Amplifier

    Are you trying to power the opamp from 100 Volts? Adam
  6. Arouse1973

    Stereo led vu-meter

    Hi Tarjei This is a basic volume unit (VU) circuit that should work. There are however other circuits that are better, but give it a try. Adam
  7. Arouse1973

    Connect LEDs to PC parallel port

    Remember for LEDs with a higher forward voltage like green, blue and white you need to change the forward voltage. Adam
  8. Arouse1973

    Khan Academy Spoutbot

    The contacts should be NO COMM NC not on. Which is normally open, common, normally closed. The common line is what switches between the two other connections. Adam
  9. Arouse1973

    Connect LEDs to PC parallel port

    Ok so you know the voltage, 5 Volts. What you do is subtract the LEDs forward voltage from this and divide by say 10mA. So for Red LED its (5-1.9) ÷ 0.01 =310 Ohms
  10. Arouse1973

    Uses of inductors

    Your welcome. Adam
  11. Arouse1973

    Coil equations

    Because of the lack of a circuit diagram and any information I can only give you an example. You will need to add the different values of resistance an inductance of your relay. You will also have to include the capacitance of the relay coil for better accuracy. But this will give you an...
  12. Arouse1973

    Uses of inductors

    Inductors have many other applications other than filters where I agree the magnetic field is usually quite small. However there are other circuits like oscillators, planar transformers and patch coils used for RFID and wireless power which without a large enough magnetic field they wouldn't...
  13. Arouse1973

    LED power source

    Yes regardless of how you are controlling them you have 300 LEDs that all need power and ground. Adam
  14. Arouse1973

    LED power source

    God thats a lot of control lines, and wires.
  15. Arouse1973

    LED power source

    Hello. Well it depends on the LED. Some LEDs draw over 1 Amp. Wont it be the shift registers supplying the current to the LEDs? Not the PIE. Adam
  16. Arouse1973

    Uses of inductors

    The big one would be motors, have a look at how these work. Adam
  17. Arouse1973

    Coil equations

    Hello I have not got a clue what your talking about. Sorry. I guess this is homework, can you post the question from your course work Adam
  18. Arouse1973

    Coil equations

    Can you be a bit more specific in what you want? Thanks Adam
  19. Arouse1973

    Microcontroller controlled by pushbutton for LED flashlight

    Added some more vias and changed the keep alive capacitor to footprint size 1206. Thanks Adam
  20. Arouse1973

    Microcontroller controlled by pushbutton for LED flashlight

    Yep will add more vias, must have missed the 5 Amps, just saw it in the first post, sorry. For some reason I had only a couple of Amps in mind. Adam
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