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  1. Arouse1973

    N Channel Mosfets

    Ok so the first thing to do is sort out the heating issue. The second issue is what Colin just mentioned, this won't work very well. Where did you get the coil design from? Adam
  2. Arouse1973

    N Channel Mosfets

    Do you have the parts on a heat sink? if so what type is it? Adam
  3. Arouse1973

    N Channel Mosfets

    I make the inductance approx. 10.8 uH for an air core. (r^2 * N^2) / (9*r) + (10*l). r = radius of coil, N = Turns, l = length. What core material are you using? Adam
  4. Arouse1973

    N Channel Mosfets

    Hello Is this 2-6 Amps what you are expecting as far as current goes. What is the primary resistance and inductance, do you know? Or can you give me the number of turns and dimension of the former it's wound on. Thanks Adam
  5. Arouse1973

    Not getting the ideal 555 output

    Hello. Colin gave you a clue in his post. It looks like you are drawing too much current from your regulator or the regulator can't supply enough current. See if you can work out what needs to be change. You mentioned it in your last post. Adam
  6. Arouse1973

    Not getting the ideal 555 output

    But your driving a MOSFET so should be fine, you might need a small resistor on the gate which depends on the gate capacitance. You need to redraw your circuit and include any changes that Colin mentioned about your regulator. Adam
  7. Arouse1973

    Not getting the ideal 555 output

    The Darlington only drives the trig pin, it does not connect to the output.
  8. Arouse1973

    Not getting the ideal 555 output

    Why do you think that's going to be an issue? Adam
  9. Arouse1973

    Increasing Current

    No worries, glad you got it sorted. Adam
  10. Arouse1973

    Increasing Current

    Can you show us how you have it connected and are they defiantly 100 Ohm resistors. 1.5 Amps would mean the resistor combination was equalled 1 Ohm. What do you mean it's supposed to be 0.9 Amps? Adam
  11. Arouse1973

    More efficient LDR "dark" switch?

    That's a very good point Hop. This would mean the transistors had much reduced gain and this could account for what is happening. Adam
  12. Arouse1973

    Yahama RX-v450 fault off BD3816K1 IC ?

    Hi dorke. If possible we need some good pictures of both sides of the circuit board and if you have a circuit diagram you could post that would be great. Adam
  13. Arouse1973

    More efficient LDR "dark" switch?

    Is it like this now I have to make it this big because @Martaine2005 is a bit poor sighted and he struggles with small images :D Adam
  14. Arouse1973

    More efficient LDR "dark" switch?

    Centre tap between LDR and 100K, what you have another resistor now that's connected to Vcc? The pot should connect to the 10K LDR and base of the transistor. Adam
  15. Arouse1973

    Turntable Spinning Fast in Reverse

    Yep Martin dead give away, DC 11 - 13 V. Nice one, this is the sort of research that is really useful. Adam
  16. Arouse1973

    More efficient LDR "dark" switch?

    Ok I am getting a bit lost now. Can you just recap where you are now as far as it working, and what resistor values you are using. Adam
  17. Arouse1973

    More efficient LDR "dark" switch?

    Ah sorry I thought you removed the LDR....So the voltages you are measuring, this is with the LDR in circuit now?
  18. Arouse1973

    More efficient LDR "dark" switch?

    Do you have the bottom end of the POT connected to 0 Volts? Adam
  19. Arouse1973

    gas detection system

    This will detect most hydrocarbon gases if of any use. I have a few of these on my desk. http://www.seceng.com.au/sed-agas-lite-gas-detection-for-atms/ Adam
  20. Arouse1973

    Microcontroller controlled by pushbutton for LED flashlight

    Looks good Hop, I admire your determination. If I had to start from scratch like you (not that I know that much) I would have given up I think and gone back to learning quantum electro dynamics, which I find easier. :) Adam
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