How to record very faint sound from the analogue input?

[Joep L. Blom]

Dotan Cohen wrote:
>> You ask me to dig up some things I did > 25 years ago. I don't know it
>> by heart any more (did when I was younger!) but will look for it
>> tomorrow although any entry-level book on amplifiers should do. Or is it
>> such old stuff and can people only work with IC's nowadays?
>> Joep
>>
> 
> Well, EE is not my field exactly and I had no idea it would turn in
> this direction! I learned to solder fixing 30 year old cars'
> electrical systems, but I have played a bit with circuit boards too.
> 
> I'll hunt a bit online if it is as basic as you suggest. Thanks!
> 
> 
Dotan,
another possibility is to go to a DIY electronic shop, which I assume 
also exists in Israel, and buy a telephone preamp kit. Otherwise you can 
search the web for companies that sell these kits. A Dutch firm, 
Velleman sells them and a much larger German (Sorry I forgot the name) 
also. In most cases they are easy to construct and come complete with 
circuitboard and components. You only need some housing to attach the 
controls (e.g. a pot-meter for volume control). You can buy them from 
aluminum but nowadays you have lots of packaging material (cardboard, 
plastic, or whatever) for housing your circuit. They normally are 
battery powered but I currently I use a leftover power supply from a 
discarded device (e.g. mobile telephone, etc.) as the needed power is 
normally very low ( a few mA is sufficient). Typicaaly the have a high 
input impedance and a low output impedance and that's what you want.
Hope this will help you.
Joep