Amplifier White Noise

[Edu Silva]

Scott Gravenhorst wrote:
> 
> I just put together a 2 transistor preamp and I noticed
> that there is some white noise, even with a shorted input...

Try this:

- Insert a 10K resistor beetween (+) and drain of the FET;
- Connect the base of the tansistor to drain and forget the trimpot and
the 100K/10K resistors here;
- Bypass the 100K resistor at the colector (jumper);
- Put a 1K resistor (or pot) beetween the emmiter and (-);
- The output now will be the emmiter (or the cursor of the pot).
- Try a 10uF electrolitic in parallel with the source resistor (try 4k7)
to increase gain.

Hope this helps.

Edu Silva
ES2 Audio
http://audiolist.cjb.net