[sdiy] Re: RTL

[Scott Stites]

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




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