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  1. CDRIVE

    Modifying AGC circuit

    I stand corrected but your statement isn't 100% correct either. What you describe is not AC. It's modulated DC that never swings below 0V. It isn't true AC until it's coupled through a cap. Then the signal will swing above and below 0V which agrees with the definition of AC. Thanks for the info...
  2. CDRIVE

    Is there a circuit that can energize a coil on 110v, and to keep coil de energized on 220v.

    Ha, I wouldn't know. I break out with hives if that crap is within earshot. Chris
  3. CDRIVE

    Current/heat dissipation control in an R-L circuit

    If you insist on using linear technology you won't be able to escape the laws of physics. Whether it's a resistor or a solid state current limiting device it's going to dissipate the same heat. That's why switch mode power supplies are soooo popular. The pass component is either fully on or...
  4. CDRIVE

    Modifying AGC circuit

    AK, you're definitely more current than I am and it should be you that guides him to the best components for his project. Heck, if I hang with this thread much longer I might start posting Vacuum Tube AGC's! :eek: Chris
  5. CDRIVE

    Modifying AGC circuit

    kruskal, I was considering simulating the LM358 circuit using an OPA134 with appropriate modifications. However AK made some very good points regarding available true RMS AGC chips. I found this with very little effort...
  6. CDRIVE

    Modifying AGC circuit

    Quite frankly ceramic caps >0.5uF are news to me. I had no idea that they even existed. Technology is rapidly passing me by.:( That said I see no reason why you couldn't use them, including for the additional DC blocking cap on the input. BTW, you do realize that unlike the LM358 the OPA134...
  7. CDRIVE

    Is there a circuit that can energize a coil on 110v, and to keep coil de energized on 220v.

    I think that would be Bo Diddley. Chris
  8. CDRIVE

    Modifying AGC circuit

    AG, how about an OPA134? Chris
  9. CDRIVE

    Voltage Follower Doesn't Work

    Does drawing it like this help you? I omitted the 10uF caps for clarity. Their function is for supply rail filtering / decoupling. Chris
  10. CDRIVE

    Modifying AGC circuit

    Yes, 10uF would be OK. Make sure the (-) negative terminal of the cap is connected to the junction of R1 & R2. Your resistors would be most commonly Metal Film variety; not ceramic. Chris
  11. CDRIVE

    Modifying AGC circuit

    The LM358 Datasheet specs the minimum supply voltage @ +- 1.5V. I don't understand your questions regarding the Caps though. I don't see any ceramic caps in that circuit. The caps are all labeled 10uF and appear to be Electrolytics or possibly Tantalum. Though I see no need for Tantalum caps...
  12. CDRIVE

    Anyone able to tell me what this is?

    Looks like a Relay. Chris
  13. CDRIVE

    Voltage Follower Doesn't Work

    Uh, I'd start eliminating possible causes with that! Chris
  14. CDRIVE

    Simple resistor overheat problem

    I thought you had high power LEDs. Which is why I mentioned 100mA. I thought I read that in your first post. For common GP LEDs you should run them at 20mA for max longevity. Chris
  15. CDRIVE

    Getting antenna to radiate

    At 146MHz everything is factor. The Amateur Radio Handbooks don't gloss over the importance the mechanics and topography involved with VHF/UHF design. Chris
  16. CDRIVE

    Simple resistor overheat problem

    No, with the proper limiting resistor each LED will still pass equal current when wired in series. It's also more energy efficient because much less power is wasted being dissipated in the resistor. In your case, ...multiple resistors when parallel wired . Chris
  17. CDRIVE

    New to forum and electronics, need help understanding a circuit

    It may interest you to know that I Spiced your circuit and it in fact produced a "Tick , Tick" sound on my laptop speakers. Chris
  18. CDRIVE

    Simple resistor overheat problem

    Your LED's should be wired in series not parallel. Subsequent to doing so you must recalculate for the proper value of 'R' to produce 100mA. Chris
  19. CDRIVE

    Getting antenna to radiate

    Damn! I can't keep up with the technology. I had to Google that! :( Chris
  20. CDRIVE

    Getting antenna to radiate

    The economy in Croatia must be booming! 200MHz scopes aren't cheap. On another note have you considered building a Field Strength Meter? Chris
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