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Vintage threads from the first ten years
| previous: Arnaud I have made a new Doctor Q. I've ch... -- 8/19/1999 5:19 PM |  |
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Re: Radio reception problem
 8/20/1999 1:25 PM |
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R.G. | Re: Radio reception problem a) is it in a metal box? b) it might be better to put an electro cap from the base of the 2N1711 to ground than on the emitter c) try a 100 ohm resistor in series with the input and a 50pF capacitor to grround at the input d) use an ohmmeter to ensure that all of your ground connections are sturdy and low resistance e) check your lead dress; if you have long, looping wires onto and off the board, they form perfect radio loop antennas. Wires should be short and direct, ideally shielded or twisted with a ground wire if they are not inside a grounded metal box. Extraneous signal pickup is one of the plagues of breaboarding. I just ignore RF, hum, flourescent light buzz, etc. when I have something breadboarded, assuming that it will simply be that way, and don't worry about it until I put things on a PCB inside a box. |
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| Arnaud Thank you R.G. ! |