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Vintage threads from the first ten years
| previous: AMZ >>I suspect m... -- 8/19/1999 9:58 AM |  |
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Re: Radio reception problem
 8/19/1999 5:19 PM |
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Arnaud | Re: Radio reception problem I have made a new Doctor Q. I've changed some things - I've put a cap across the zener - I've plugged my amp in a power outlet *with earth* in my basement And there is still this #@&?#! radio ! Even with input to ground. My power supply seems not very good. I still hear a loud 60 Hz hum thing though the Doctor Q doesn't amplify very much. Here is how I do it: an AC adapter gives me an almost-continuous 12V. I filter it through a RC low pass filter (R=47ohms C=1000uF). The filtered signal is connected to the collector of a 2N1711. I do the zener thing. I filter the resulting signal on the emittor with a 220uF. I've tried to search it on my hi-fi and I've only found it on FM band ! EH has found out a new kind of PLL ! I've also tried to put a capacitor to ground everywhere: input, output. Doesn't change anything. Don't know what to do ... |
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| R.G. a) is it in a metal box? |