TTL homebrew CPUs - OT radio

[Allison]

>
>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:
>
>> 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
>

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