[sdiy] Re: RTL

[harrybissell]

wotch it...

Diode "or gates" fall into the category of DTL (Diode-Transistor Logic)...
a brief stop between RTL (Resistor Transistor Logic) and TTL.

Craig Anderton's "Timbre Gate" project from Popular Electronics used
an RTL nand gate (iirc) abused to become a linear amplifier in a fuzz
circuit - my first DIY project at 15yrs old (long long ago)

H^) harry

Peter Grenader wrote:

> 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
> >
> >
> >
> >
> > PeoplePC Online
> > A better way to Internet
> > http://www.peoplepc.com
> >