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  1. CDRIVE

    Appropriate diode fo my circuit

    And no Frog DNA either. We know what happened the last time! :p Chris
  2. CDRIVE

    Appropriate diode fo my circuit

    Tony, to help you understand why LEDs should not be paralleled I simulated it. I used a Red and a Yellow LED because the operating voltage is much higher for Yellow LEDs and I wanted my point to be dramatic. Note the current through each LED. You'll see that the Yellow LED's current is so low...
  3. CDRIVE

    Appropriate diode fo my circuit

    Tony, what happened with this schematic? It's correct! The LEDs are in series as they should be. After examining your last schematic further I've found more parallel LEDs (through Diodes) that I didn't see before. In fact because of your parallel LEDs issue Dork's suggestions to eliminate some...
  4. CDRIVE

    Appropriate diode fo my circuit

    Because when LEDs are wired in parallel you can't guarantee that the current through each LED will divide equally. I think we have a LED section that addresses this thoroughly. Series wired LEDs is SOP. Chris
  5. CDRIVE

    Appropriate diode fo my circuit

    Tony, nice job on the schematic. Well drawn and laid out. Others may see other issues but the only buggaboo that I see is your parallel wiring of L1, L2 and L7, L8. LEDs should not be wired in parallel. Wire them in series instead.;) Chris
  6. CDRIVE

    Need advice on relay. (Wiring rf transmitter into burglar alarm)

    Actually, if the PIR pwr is disabled when disarmed that would be a perfect solution. Though my gut tells me we're going to be doing dissection on SMD!:( Odd that there's no "Armed" indicator. Chris
  7. CDRIVE

    Free Energy / Energy Harvesters / Perpetual Motion

    Yes, the odds are that I saw something on the net while at the same time drinking with abandon. :D There is something missing from my design though. The little permanent magnet motor/generator output should be feeding a magic DC/AC converter. It's magic because with 1milliwatt input you get 1000...
  8. CDRIVE

    Free Energy / Energy Harvesters / Perpetual Motion

    I don't know what all the fuss is about. Of course Over Unity / Perpetual Motion exists. Here! I invented one too! All it needs is a little shove and it runs forever!!:p:rolleyes: Chris
  9. CDRIVE

    Help me draw this circuit's diagram

    I hope I didn't step on Edd's toes here. After all he's put a lot of time in playing "Quincy EE"... 'Electro - Examiner'. :) Good luck and keep us posted. Chris
  10. CDRIVE

    Help me draw this circuit's diagram

    The longer this thread runs the less it makes sense to me. I don't get why you're struggling to figure out your existing circuit. :confused: The circuit in the link I posted has been tested, published and documented for you and its function is no different than the circuit your battling with...
  11. CDRIVE

    Need advice on relay. (Wiring rf transmitter into burglar alarm)

    Sion, this is going to be like shooting in the dark and it's doubtful that we'll be this lucky. Here's what I'd like you to do. Test the 24H loop with a DMM set to read Amps. Measure the loop current with the System Armed and Disarmed to see if there's a difference. Do the same with the other...
  12. CDRIVE

    Need advice on relay. (Wiring rf transmitter into burglar alarm)

    I skimmed through the PDF. It's well documented and happily absent of any Chinese pigeon English. These days that's a treat! :D Yup, it's odd that the system does not employ an "Armed" indicator! Chris
  13. CDRIVE

    Peculiar MOSFET operation ??

    Check out the FDN358P. It's not a TO92 but it is a small SST-3 package. Harald, there's always more to learn. I had no idea that the body diode was a manufacturing byproduct. All these years I've been laboring under the mis-impression that it's an integral protection diode that shouldn't be...
  14. CDRIVE

    Linker files

    Dev, those are flattering words and I thank you for them. I do lurk in the micro section now and then, so I am picking up bits and pieces of ASM, C and Pic dependencies. Sort of like osmosis. :) Chris
  15. CDRIVE

    Peculiar MOSFET operation ??

    He said it's a P channel. In that case the Drain Source orientation would be the same as a PNP when used for high side switching. IE, the Emitter (Source) would be connected to the positive rail and the base (Gate) forward biased by bringing it closer to GND just as he's doing. His load is where...
  16. CDRIVE

    Need advice on relay. (Wiring rf transmitter into burglar alarm)

    Sion, welcome to EP! Can you give us the manufacturers name, model number and possibly a link to the product. In lieu or even addition to that we will probably be asking for clear photos of the guts. Chris
  17. CDRIVE

    Linker files

    Dev, the optimism of the young is a wonderful thing.. keep on truck'n! Old dogs have a very different view on things. There comes a time in everyone's life when the realization of time left is not a distant concept. What you're going to do with that limited time becomes of paramount importance...
  18. CDRIVE

    PWM circuit with a mind of its own...

    Yes, I fully agree that there's no point in blowing air over a device that's the same temperature as the device. Along with the other comments made regarding decoupling practices it's good practice and sometimes absolutely necessary to have an anti-ringing resistor (snubber) in series with the...
  19. CDRIVE

    PWM circuit with a mind of its own...

    Am I missing something here? I don't get the purpose of the ambient temp thermistor. I would think that the temperature of the heatsink should be of exclusive concern. After all, even if the ambient temp is 30 deg F you would still want the fan to turn on if the heatsink is too hot. Here's a...
  20. CDRIVE

    Help me draw this circuit's diagram

    Where's the MOSFET? Chris
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