[sdiy] Re: RTL

[Tim Parkhurst]

Here's a start on Ray Wilson's site. It's known as MML or "Mickey Mouse
Logic". Really! These techniques still use an IC (74HC14 schmitt trigger
inverter) but show you how to create several different types of gates with
various diode and resistor combinations.

http://www.musicfromouterspace.com/analogsynth/mmlogic.html


Ciao!

Tim (really!) Servo
"Imagination is more important than knowledge." - Albert Einstein




> -----Original Message-----
> From: Scott Stites [mailto:scottnoanh at peoplepc.com]
> Sent: Friday, March 19, 2004 9:41 AM
> To: synth-diy at dropmix.xs4all.nl
> Subject: [sdiy] Re: RTL
> 
> 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
> 
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