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  1. S

    Dual polarity power supply for circuits

    Low current circuit, .... Your circuit should be pretty simple and inexpensive.
  2. S

    Dual polarity power supply for circuits

    Yeah, a little more info about what you're going to use it for, would help. If you need the 6VDC, you could bump up to the 7808/7908 (8Volt regulators), with a fixed resistor to drop the 8V to 6V. If you expect high currents, get the TO-3 power transistor package. And like davenn said, you...
  3. S

    Dissipation factor of capacitors

    If the data sheet doesn't show a graph to find your freq, email EPCOS, and ask them about your specific application. I use a lot of metallized polyester for RF applications, so I assume you're ok. But it's possible the construction of this particular cap is not designed for the frequency...
  4. S

    Disappearing fuse wire

    Half an amp. I'm not surprised you can't find remnants. The fuse filament probably had SOME dusty debris, but too small for you to notice. Vaporized, does mean that.
  5. S

    capacitor replacement

    It's generally considered better to go over (the 25ufd). Same with voltage, you can go over, but not under.
  6. S

    lithium button battery doesn't charge - need help understanding

    Yeah, and a lot of Chinese batteries use metal/chemical mixes that don't meet authentic industry standards. Knock yourself out on the assembly, but bear in mind, your battery MAY actually be bad.
  7. S

    Charging 1 kV capacitor?

    And some safety glasses, I hope.
  8. S

    Technics SL-1350 tonearm does not drop vertically.

    One idea to check. I have a Pioneer that I had a similar problem with, the lift arm surface was curved, and the angle of the curve in relation to the arm assembly was adjustable. Is it possible the lift arm angle is a little out of adjustment? (Bumped out of alignment, so it doesn't set the...
  9. S

    Help with electret condenser microphone

    Yeah, or you've got a broken wire (or shorted). Just a thought, to check the plug ends where the wires are at, before assuming the mic itself is broken.
  10. S

    remote lighting

    Incandescent 100W Flourescent 30W LED <2W He wants to run this with a battery.
  11. S

    remote lighting

    First thing I would consider, is replacing the flourescent lamp, with an LED (light emitting diode) assembly. It'll keep your power consumption WAY down, compared to what a Flourescent bulb will use in wattage. Interestingly to me, a lot of these LED assemblies are made to replace incandescent...
  12. S

    Guitar tube amp problems

    All the tubes I know of still in production today, are made in Russia. And yes, they're being built for high-end audiophiles. Miltoy pegged it, find somebody with a tube tester, and check your tubes. Loud playing won't hurt the tubes. They're still in use today, because they are much more...
  13. S

    Metal Detector components!!

    I may be wrong, but I think those BF transistors are European numbers. If you aren't required to build the particular schematic you have now, you might consider looking for one with American (hell, even Japanese anymore), numbered parts. There are a lot of clubs that are into metal detectors...
  14. S

    IC help

    Shouldn't be a problem. LS is low power, schottkey (low noise). (Just don't try the reverse, a circuit designed for 'LS' often won't work acceptably with the 74168). Most people know it, but for IC idiot: The the family IS TTL (Transistor-Transistor-Logic) Prefixes usually identify the...
  15. S

    18 volt timer

    My only input, would be that over time, you may cook your 12V motor, running it at 18V. I think you should drop your voltage, then work on your timer. Frankly, I'd be looking at an already build timer, mechanical if possible (used a lot in sauna/spa applications. (Works basically like an egg...
  16. S

    Memory backup batteries

    Kind of a tough question without knowing your circuit. (Especially if there's some type of low value recharging going on, ...Nickel Cadmium for memory back-up?) Mostly what's out there for memory back-up these days is lithium. What's got me worried, is if your circuit has some kind of...
  17. S

    An intro and some first project questions...

    If this is a project for your entertainment, more power to you. As disappointing as is might sound, considering the time and trouble I'd anticipate; I'd go out and buy an off-the-shelf system from a store, and install that one. There are probably a dozen other electronics home projects you...
  18. S

    solar panel power loss

    Ok trobbins, I'll have to look into the latest and greatest. Hey, Hope Johnny 5 got the answers he wanted.
  19. S

    DIODE COLOR BANDS

    shaun, I've been all over the internet. I can't find anything that'll get you an ID with two bands. A couple sites have interesting charts on how to read diode ID's: Google: diode color code www.tpub.com - entry gets you directly to the correct page www.crystalradio.net - entry gets...
  20. S

    solar panel power loss

    Why do I have a problem believing BP's claims, when they're pushing 'going green' in publicity ads? Looking for government subsities. And what are they going to say after 20 years? Oops, we made a mistake, but oh well, those claims are 20 years old, and we didn't have all the data? Actually...
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