11 Jul
2007
11 Jul
'07
2:59 p.m.
Subject: Re: TTL homebrew CPUs - OT radio
From: woodelf <bfranchuk at jetnet.ab.ca>
Date: Wed, 11 Jul 2007 14:52:31 -0600
To: General Discussion: On-Topic and Off-Topic Posts <cctalk at
classiccmp.org>
Roy J. Tellason wrote:
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.
Allison
Since a lot of parts like UJTs aren't ax
commonly available as they used to be
I poked around some and found stuff online as to how one might "make" one
using a complementary pair of transistors. Couple each base to the other
one's collector, and you have an SCR, an SCS, or a PUT, depending on how
you wire it up. Not all that much difference between them... :-)
Well I found this surfing last night. Fet + Pnp = Strange radio.
http://www.schmarder.com/radios/solidstate/homodyne.htm