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  1. CDRIVE

    video over cat5 without baluns

    That's the max rating on the PSU, your draw per camera will be much less. At 75' I wouldn't loose any sleep over the voltage drop on CAT5. Chris
  2. CDRIVE

    Trouble with diffrential amplifier output

    The first thing that comes to mind is your bridge. Speaking of which, why is the balance pot 10K? Also, getting down to absolute zero on a single ended OpAmp can be difficult. Chris
  3. CDRIVE

    Simple 555 synth idea

    I'll let Bob handle the active filters. The center lug on the pot is the wiper. Chris
  4. CDRIVE

    video over cat5 without baluns

    You do realize that CCTV has been transmitted over CAT5 for well over a decade. They sell a small inexpensive passive video adapter that I've always assumed to be a video balun...
  5. CDRIVE

    regarding capacitors as shorts for ac

    I disagree with any coupling caps being treated as shorts. The value of a base coupling cap for a BJT Common Emitter AF amplifier is going to be many magnitudes larger than a Gate coupling cap for a JFET. If we're talking rail bypass (decoupling) caps that's different matter. I can accept them...
  6. CDRIVE

    Western Electric 1953 box of 1698 point contact transistors

    There's an irony here. The 1N34 is a very old diode. Born during the vacuum tube era, It's still viable today. While it doesn't command a collectors price, it's as popular for it's purpose as it ever was in its prime. When surfing pages devoted to crystal radio you'll soon see that despite the...
  7. CDRIVE

    Simple 555 synth idea

    Those what? I have no idea what your referring to. Are you talking about active filters as Bob mentioned? Also, RC filters, active or otherwise, are not resonant. No, I specifically said "measured across the fixed terminals". When a 250K (linear) pot has its wiper set to 50% it will measure...
  8. CDRIVE

    Simple 555 synth idea

    A 250K Pot should measure 250K across its two fixed terminals. The accuracy of this is dependent on the manufacturers specs. Most common pots measure << +- 10% error. Chris
  9. CDRIVE

    Electromagnetic radiation production and detection

    This is what duke is describing to you. Think of it as being analogous to striking a tuning fork. They don't resonate forever either. Chris
  10. CDRIVE

    Simple 555 synth idea

    Yes, I can appreciate that. Chris
  11. CDRIVE

    Simple 555 synth idea

    Like this but RS isn't the only place you can buy these. http://www.radioshack.com/product/index.jsp?productId=2734155 However, they're not intended for permanent circuits in any shape or form. They're intended for experimentation level wiring. Chris.
  12. CDRIVE

    Electromagnetic radiation production and detection

    No, not in this world. What you're describing is "over unity" also known as "perpetual motion". Neither of which exists in this dimension. Chris
  13. CDRIVE

    Custom Mouse and Keyboard

    Maybe at one time in history but today a college instructor would be the last place I'd seek originality of thought and creativity. Perhaps a night instructor with an un-cloistered daytime job would be a prospect though. Personally, I would look for someone in your own age group that possesses...
  14. CDRIVE

    unusual signal conditioner needed

    Wow, that would be a lot of unused real estate... Nunno. Chris
  15. CDRIVE

    unusual signal conditioner needed

    Google AD5220 and AD5228 Digital Pots. Chris
  16. CDRIVE

    Custom Mouse and Keyboard

    Why would someone want a mouse two and a half times larger than a conventional one? Is the mouse going to have keyboard functions? Chris
  17. CDRIVE

    Need help making lights pulsate with music

    A PA Line Transformer wired in reverse should work. Chris
  18. CDRIVE

    Variable Transformer & Home Made Resistor

    No matter how you cut it you have 3.6KW to dissipate either as heat or as mechanical energy. It would be nice if you could do something useful with it instead of merely wasting it. I say wasting it because, unless I'm reading this wrong, this is a dummy load? On the up side it helps heat the...
  19. CDRIVE

    Tilt Sensor Project

    It would be low tech but a series of mercury switches and logic gates would work. Chris
  20. CDRIVE

    Simple 555 synth idea

    Referring to BM's schematic, signal ground looks like inverted triangles. It means all those points are tied together. Battery ground also looks like an inverted triangle but represented by a series of horizontal lines. All those points are also tied together. You can build the circuit on a...
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