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Ancient Radio Shack "Frequency Standard" kit

Discussion in 'Misc Electronics' started by Norm Dresner, Aug 4, 2004.

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  1. Norm Dresner

    Norm Dresner Guest

    Cleaning out a closet recently I stumbled across a Radio Shack kit I built
    when I was just teaching myself electronics (2/25/80 according to piece of
    tape I stuck on the side of the box). It's a "frequency standard" -- a
    one-transistor oscillator with a 100 KHz crystal and a variable capacitor
    for trimming the output. Unfortunately I can't find the instruction sheet
    that came with the kit. As built, there are two wires (one each Red &
    Black) that come out connected to a power switch. I'm sure that the curcuit
    isn't very complex (total of 5 R, 4 fixed C, one Q, one Xtal and one
    variable C) and while I could trace it out, I'm not really that interested
    in the analysis of it as much as I am in seeing if it still works. But,
    without the instruction sheet, I don't know what voltage to apply. Yes, I
    could drag out a variable power supply and run it up slowly, but I was
    hoping that someone might either still have the instruction sheet handy or
    know what voltage it requires. (I tried a single AA cell and got no
    oscillation; I can imagine that it was designed for 5V or 9V or anything

  2. 9 volts should be safe.
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