You might want to check out VE7BPO's site for DC receiver ideas. He
has lots of experimental circuits using NPNs and he will respond to
emails if you have any questions.

http://www.qrp.pops.net/

Good luck - Roger


Nev wrote:
Does anyone have any schematic for Direct Conversion receiver that does not
use any FETs, Valves or ICs (e.g. NE602) but uses NPN transistors?