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  1. CDRIVE

    Looking for resistor value and capacitor value for passive low pass filter remove RF

    When I think that your posts can't get any more off the wall you manage to once again raise the bar another notch. At the age of 15 you said you made your own speaker and the coil windings oxidized. Are you implying that this was not (insulated) magnet wire? FYI, a semiconductor junction means...
  2. CDRIVE

    Looking for resistor value and capacitor value for passive low pass filter remove RF

    There is of course skin effect as frequency increases but I think Steve nailed it. It's what I would have done too. Speaking of that gentleman's construction practices ... I like them very much. Crystal radios should be show pieces, which he certainly accomplished. Chris
  3. CDRIVE

    Demodulation

    When you posted this it went right over my head but that was before I was enlightened! :) Chris
  4. CDRIVE

    Tube amp acting very strange-- tubes acting as speakers

    First off there's no such thing as "transmitting audio inductance". Inductance isn't transmitted. Secondly RF energy, ergo 'antennas', have little in common with Inductive Audio Loop technology. In an Inductive Audio Loop only a small fraction of the energy in the loop escapes the loop...
  5. CDRIVE

    How to stop LEDs lighting at low current

    VD, you did it! You found the errant wiring on your own. A gold star is bestowed upon you. I do have a request and some observations though. First the request... (1) Please name the components in your schematic, like R1, D2, K1, etc. (2) Place an asterisk next to any component that's not...
  6. CDRIVE

    Looking for resistor value and capacitor value for passive low pass filter remove RF

    Ground Control to Major Tom.... Please be advised that our instruments indicate that your oxygen levels are dangerously low. Mission Command recommends initiating emergency protocol. I feel like I'm talking to myself! Yes, I do that occasionally but the conversations are more productive...
  7. CDRIVE

    How to stop LEDs lighting at low current

    Take another look at where your LEDs are getting their power source. Chris
  8. CDRIVE

    Bottleneck 555's 0.2A Stuck project

    What about Maplin? Isn't that where most of the UK shops for components or are they the UK's Radio Shack? Chris
  9. CDRIVE

    Looking for resistor value and capacitor value for passive low pass filter remove RF

    If you had posted this in the beginning of your thread instead of all the weird crap we'd be done with this thread by now. What the author did in his circuit is nothing like what you're attempting. The output of his FM Crystal set is High Z and is fed to a High Z input jack of an audio...
  10. CDRIVE

    How to stop LEDs lighting at low current

    Uh, something odd in your schematic. I was going to tell you exactly what but you'll get more satisfaction from finding it your self. It has nothing to do with your leakage problem though. At least that I can see. Hint: The wiring of the relay you added and DRL. If anyone else answers...
  11. CDRIVE

    Car Speaker LEDS

    Steve, nice detailed answer. Just for the record I chose a 1N4002 because they're so common and I didn't see any high speed requirements in his application. On the other hand if I were doing what he is and I had both diodes on hand the switching diodes would be my choice too. ;) Yes, I know...
  12. CDRIVE

    Variable power supply for supplying valve amp builds

    Duke, I like that. good thinking! ;) Chris
  13. CDRIVE

    Bottleneck 555's 0.2A Stuck project

    For those who are experiencing headaches after viewing 123244's schematics do the following. Save it and open it in the Picture-Fax Viewer and rotate it clockwise 90°. Viola!! The headaches magically disappear! :D Chris Edit: I think you need a small value resistor (~10R ) between pin 3...
  14. CDRIVE

    Looking for resistor value and capacitor value for passive low pass filter remove RF

    After Dave's last post I had to know what triggered his response. As wacky as this thread is I knew there had to more going on to set him off like that. So I navigated to one of your other topics and posted there. You may want to read it...
  15. CDRIVE

    Tube amp acting very strange-- tubes acting as speakers

    What you're trying to do is not new science. It's actually been done commercially. One of my first jobs was working as an AV tech. The company I worked for supplied and maintained audio visual aids for schools. We sold and installed two types of wireless headset systems. One was RF and more...
  16. CDRIVE

    How to stop LEDs lighting at low current

    Is anyone besides me curious why this transistor doesn't completely turn off? Chris
  17. CDRIVE

    Amplification of a dc current

    A hall effect or photo transistor mechanically interfaced to the armature would work with any kind of drive, including PWM. Just input the signal to the uC and let it do the work. Chris
  18. CDRIVE

    Variable power supply for supplying valve amp builds

    It wouldn't be regulated but a Variac feeding the input of your transformer would give you the adjustable output voltage that you want. HV regulation was not a common feature in the day. Chris
  19. CDRIVE

    How to reduce DC a bit without resistor or capacitor? Is there a simple solution?

    Steven, I forgot to mention that a bridge connected to the mains is not a good or safe idea. Your schematic indicates that the negative end of your bridge is grounded. If that's earth ground you can't do that. If you do the diode at 10:00 will pop like a fire cracker! This is because circuit...
  20. CDRIVE

    How to reduce DC a bit without resistor or capacitor? Is there a simple solution?

    Steve, that's just toooooo clever!! ;) It brought a smile to my face. It's been a crappy month so I needed to smile. :) Chris
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