[sdiy] Re: RTL

[James Patchell]

Try and locate an old GE Transistor Manual from around 1964.  A very 
interesting book to have in any case, but it discusses the basic circuits 
for doing the various logic gates that existed at the time.

At 12:41 PM 3/19/2004 -0500, Scott Stites wrote:
>Can anyone point me to some good web resources on these techniques (RTL 
>logic gates rather than IC's)?
>
>Cheers,
>Scott
>
>
>-----Original Message-----
>From: TIm Daugard <daugard at sprintmail.com>
>Sent: Mar 19, 2004 11:01 AM
>To: synth-diy at dropmix.xs4all.nl
>Subject: [sdiy] Re: RTL
>
>
> > Ah yes...RTL.  When I was in high school (1969) I built a 4 bit binary
> > up/down counter using the Motorolla HEP RTL parts.  I think I still have
> > some of those dang things....somewhere.  RTL brings back only happy
> > memories for me...since I never had to design the stuff into a real
> > product...
>
>I still use RTL. A transistor and two or three resistors is cheaper than 
>using a
>logic chip if I only need one or two gates. Two resistors and a 7 cent
>transistor gives me an inverter. Three rsistors and the transistor for a gate.
>Sometimes I cheat and throw in a diode or two.
>
>I need to try some of the single gate mini chips, but I've been avoiding 
>etched
>PC boards and SMD. I can build a module in the time it takes to lay out an 
>etch
>a board.
>
>Tim Daugard
>
>
>
>
>PeoplePC Online
>A better way to Internet
>http://www.peoplepc.com

         -Jim
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