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  1. Arouse1973

    Audio Amplifier problem

    LOL how did you do that? Brilliant Kris! Adam
  2. Arouse1973

    threshold voltage of a MOS transistor

    So what value are you sending out? 0.5V, 1.5V, 2.7V or all of them. What do you want the circuit to do when it receives the voltage? What are trying to do? Adam
  3. Arouse1973

    threshold voltage of a MOS transistor

    It will depend on how much current you want to control. Tell us more about your project and what you want to do. Adam
  4. Arouse1973

    Decoupling capacitors

    It's the ESL that dominates at high frequency because the ESR is normally very low with ceramics anyway. Adam
  5. Arouse1973

    Decoupling capacitors

    I use 10uF ceramics as standard PDS support on most of my designs now. I even use some 100uF ceramics for certain applications. For the 100uF I limit the working voltage to about 6.3V, otherwise they get very expensive. Adam
  6. Arouse1973

    Fire distinguisher schematic help - I'm serious

    Good one Harald. Also specialist thermopiles exist for this purpose tuned to the resonant frequency of CO2, between 4.2um -4.3um. Which is the wavelength that CO2 resonates at when burning hydrocarbons. You could also look at near IR devices and UV. Also flames flicker at a certain rate as...
  7. Arouse1973

    Guitar help

    Yes I did also but thought he might be able to compromise :) I got two guitars here with me so I might have a play at the weekend. Adam
  8. Arouse1973

    Guitar help

    Parasitic power would come from the audio signal from the guitar pickup. A hum bucker pickup would be best for this. Might not be the right terminology. Adam
  9. Arouse1973

    Guitar help

    A hard strum on all strings will produce enough voltage to trigger an LED, but the problem is the current might not be enough. I think You would need to have some interaction with these boxes for it to work, like flicking a switch which passed the signal to a small circuit. You wouldn't need a...
  10. Arouse1973

    Audio Amplifier problem

    Hi Sylvester. When you reply to Kris can you add the following information please. What type of speaker, mid range, tweeter, bass or full range are you using and what wattage rating does it have. What speaker cable and length are you using. What power source are you using. Battery?, Wall wart...
  11. Arouse1973

    Delayed Circuit connection

    Yes Kris, you know me too well. I love novel ways of doing things. I do a similar thing with transistors to speed up switching sometimes. Adam
  12. Arouse1973

    Delayed Circuit connection

    Very neat idea Kris. Adam
  13. Arouse1973

    Help identifying a 5 band resistor

    I have seen many fuse resistors blow, we used to use them as indicators. The burnt dot does look like what I used to see all the time. Also a white 5th band indicates a fuse type for some manufacturers. Adam
  14. Arouse1973

    Question about relays

    Funny, this morning while I was looking in my draws... of components that is. I came across a very small relay EA2 series by NEC...
  15. Arouse1973

    Question about relays

    I was thinking of maybe using the transistor to switch the PWM to the LED strips. And when you want to turn off the PWM to all you simply turn off the transistors using an external source and you could use this external source to drive the red strip fully on via another transistor. The PWM will...
  16. Arouse1973

    Question about relays

    I don't think you need to isolate the power but just isolate the cathodes of the LEDs. I can't see how this would hurt if you just switched out the cathodes of the LEDs you don't want to light. I was thinking maybe some transistor switches instead of a relay. Adam
  17. Arouse1973

    Question about relays

    Hello How much current does each LED strip draw, i.e. each colour? Can you keep the power supplied to the strip all the time and just switch out the cathodes of the LEDs you don't want to light and then just switch in the red LED. Adam
  18. Arouse1973

    Wireless lightbulb from Tesla coil

    Really ok. Lets leave it at that then. Adam
  19. Arouse1973

    Wireless lightbulb from Tesla coil

    Just by holding the bulb no you won't but if you have a good enough connection to ground and you are touching the other terminal I think you can. Adam
  20. Arouse1973

    Wireless lightbulb from Tesla coil

    Hello One side of the tesla coil needs to be grounded. The air is conductive enough at such high voltages to allow enough current to light the bulb. Think of the air as invisible wires which become quite conductive at high voltages but you can't see them. Adam
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