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  1. CDRIVE

    Current source OK until load disconnected

    You never did say what exactly "blows up" but here's some food for thought. Whichever component fails it did so from over voltage breakdown. Either replace the failing components with models that can handle the open loop voltage or investigate whether the unloaded voltage can be reduced while...
  2. CDRIVE

    Dimmer circuit help

    Perhaps a more elegant solution would be replacing your pot with a model that incorporates an integral switch. It can replace the power switch in your schematic. On the other hand PWM makes a much better motor controller than a linear regulator. Chris
  3. CDRIVE

    Voltage Drop

    When measuring between any two nodes one node will always be zero with respect to the other node. The other node can be a positive or negative voltage with respect to the node we're calling zero. The voltage drop across a resistor will be equal the resistance times the current through it or E=...
  4. CDRIVE

    Current source OK until load disconnected

    Uhh, I don't know. I'm clueless! :confused: Do I get a prize if I get it right? I hope its not a secret. Chris
  5. CDRIVE

    Circuit for converting ammeter to voltmeter.

    I deleted the lengthy explanation that I was going to post. Instead I chose to agree with you. You're absolutely correct.... Really! Steve and I are know nothing morons. We're here because we like giving bad advice to people that obviously have far more experience than we do. Chris
  6. CDRIVE

    Current source OK until load disconnected

    Personally I don't think this problem can be resolved in this section of EP. Perhaps if it's moved to the "Secret" section ...? Since I find it fun to guess what secret function secret circuits are providing as well as the secret consumer targets, I cast my secret ballot on some sort of...
  7. CDRIVE

    555 Mosfet driver problems

    True but his time constant is only about 500mS, yet (he said) the lamp is always on. Chris
  8. CDRIVE

    Powering 2 Devices from 1 Adapter

    Just make sure that you wire the polarity correctly. Chris
  9. CDRIVE

    Powering 2 Devices from 1 Adapter

    You don't have to know exactly what each one draws. Since they both use identical power packs just read the current specs (it's printed on them) from one of them and multiply it by 2. Chris
  10. CDRIVE

    Magnet coil help (turns, gauge, for coilgun)

    Google "Squirrel Launcher". Now that's funny and they don't get hurt...usually! Chris
  11. CDRIVE

    Battery powered wireless microphone

    A load uses only as much current as it needs. If a device operates on 18V @ 1A it doesn't matter if the battery can deliver 1000A. Chris
  12. CDRIVE

    Circuit for converting ammeter to voltmeter.

    That would be an Electrodynamometer. One coil measures voltage while the other measures current. They're expensive and I doubt that's what he has. Regardless of what type of meter he has he should use it for what it was intended. What he wants to do is exceedingly impractical Chris
  13. CDRIVE

    Circuit for converting ammeter to voltmeter.

    This just basically repeats Steve's comments...>> Your meter scale is -2A - 0 - +2A. If full scale = 2V then R would be 1 Ohm and Pd @ full scale would be 4W. If full scale = 20V then R would be 10 Ohms and Pd @ full scale would be 40W!. What you want to do makes no sense at all. I can...
  14. CDRIVE

    Magnet coil help (turns, gauge, for coilgun)

    Coming from a guy that never gave coil gun theory much thought this was an enjoyable read. Since I have an affection for anything that launches projectiles I'm surprised that I've never investigated them. I doubt that I'd give up my Garand for one though. Come to think of it, I don't think I'd...
  15. CDRIVE

    Circuit for converting ammeter to voltmeter.

    The most common use for moving vane meters is for AC measurement. Besides that I see no purpose for a center zero AC meter. Since the vane moves in the same direction regardless of polarity how would a center zero moving vane meter deflect to the left? On a side note, a moving vane meter would...
  16. CDRIVE

    For what value of L, will this circuit resonate at 332kHz?

    When you replaced the inductor (bad move) did you destroy it? If not do you still have it? I would very much like to see a some photos of this receiver, including the front and rear panels. On another note I agree with duke regarding the high Q of this circuit. Inductance was kept low to...
  17. CDRIVE

    Circuit for converting ammeter to voltmeter.

    Steve is just having fun with you. That's not saying it isn't true but only if you can't remove the shunt. Chris Edit: I just re-read this quote and Steve is NOT having fun with you! What you're wanting to do is totally impractical unless this meter is going to be used to check your...
  18. CDRIVE

    Circuit for converting ammeter to voltmeter.

    So you're saying the shunt is not internal, it's visible and across the meter terminals? Does the movement say what the movement uA, mA rating is? It's usually in small print on the lower part of the white face. Chris
  19. CDRIVE

    Motorcycle Flasher Issue

    You can use a 5V model with a dropping resistor is series with the coil. http://www.mpja.com/Mechanical-Relays/products/134/ Chris
  20. CDRIVE

    L7805CV 5V Voltage Regulator to IP camera over POE

    Ditto to all of what CC said. This might be useful to you too. Since the CAT5 terminates in a router port your pin-out config should be "Straight Through". http://www.trangosys.com/support/cat5-ethernet-cable-pin-out.shtml Chris
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