[sdiy] Re: RTL

[Peter Grenader]

Look at Ken Stone's site.  He uses discrete logic gates all the dang time.

I have a couple on Milton as well (diode OR gates) for the manual -or-
external start/stop commands that reset a flip flop required to create the
obedient pulse that drives the whole magila.




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
> 
> 
> 
> 
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