12 Jul
2007
12 Jul
'07
12:17 a.m.
Allison wrote:
woodelf wrote:
(And is actually a circuit dating from the 20's or earlier when designers were
trying to maximise the benefit from each vacuum tube. Common as a one-tube radio
design.) (Oh-oh, going OT).
Well I found this surfing last night. Fet + Pnp =
Strange radio.
http://www.schmarder.com/radios/solidstate/homodyne.htm
That is a simple DC coupled amp that is used to first amplify RF then
the detected audio is passed through again. The fet is for high input
impedence and the transistor is for increased gain. Other wise know as
a reflex receiver.