[sdiy] Weird old logic chips & transistors

[Roy J. Tellason]

On Sunday 04 December 2005 09:00 am, Scott Gravenhorst wrote:
> Hmm.  Might there be some analog application for RTL ICs?  I mean, would
> there be a way to run them (like RTL inverters) in "linear" mode something
> like a 4069UB?  I don't know enough about RTL (probably not totem-pole
> output) to know if I'm talking through my hat.

Yes.

It's been a *long* time since I saw the magazine articles talking about this 
stuff,  but I have a vague recollection of something like a 10K resistor 
connected across a unit.

An RTL inverter typically consists of a single transistor,  emitter to ground, 
collector is output,  a resistor going to +Vcc (3.6V is assumed but anywhere 
from 3-6V seems to work fine),  and a series resistor to base being the 
input.  The typical 2-input NOR gate is two of those transistors with a 
common collector resistor.  And yes,  I remember some linear applications 
somewhere or other that used these parts,  though many of my old magazines 
are still in storage and I haven't got them organized or ready access to them 
at the moment.

> harrybissell <harrybissell at prodigy.net> wrote:
> >Most of your haul is RTL  (two generations pre-TTL)
> >
> >I'm really depressed that your GRANDFATHER had this stuff... I makes
> >me feel very, very old. Even older than I did today as I built a test
> > fixture for work on old-school barrier strips (phenolic with lugs on
> > it... :^).
> >
> >My first fuzzbox used RTL cans... it was from a 1970 article in Popular
> >Electronic called "Timbre Gate" by Craig Anderton.
> >
> >H^) harry
> >
> >Aaron Lanterman wrote:
> >> My parents came to visit this weekend, and my dad hauled along a massive
> >> pile of old electronic parts that he had inherited from my granddad; I
> >> had mentioned I was getting into circuits, and he thought they'd get
> >> more use here with me.
> >>
> >> Anyway, I'm sorting through it - I came across some 74 series I
> >> recognized, as well as a couple LM380N amplifiers, and a whole bunch of
> >> LM324N op amps (which I recall seeing in some synth designs, if I recall
> >> correctly).
> >>
> >> Then there's a whole bunch of weird logic chips. At least, when I type
> >> the #'s into datasheetarchive, they come up as logic chips, with the
> >> following descriptions (quantities I have listed in parens):
> >>
> >> N8416A 3-Input NAND-Function Logic Gate (4x)
> >> N8270A          4-Bit Shift Register (2x)
> >> N8826A          Dual J-K Flip-Flop      (2x)
> >> N8266B (?) (2x)
> >> SP321A          Dual J-K Flip-Flop       (1x)
> >> SP328A          Dual D-Type Flip-Flop    (2x)
> >> SP362A          Single Monostable Multivibrator (5x)
> >> SP380A          1700mV nor gate   Philips (6x)
> >>
> >> MC667P          Dual Monostable Multivibrator (4x)
> >> MC717P          2-Input NOR-Function Logic Gate (1x)
> >> MC719P          4-Input NOR-Function Logic Gate (5x)
> >> MC725 (handwritten) 4-Input NOR-Function Logic Gate (1x)
> >> MC778P Dual D-Type Flip-Flop (5x)
> >> MC789P ? (5x)
> >> MC790P ? (1x) (dual JK flip-flop - from online forum)
> >> MC791P ? (1x)
> >> MC792P   3-Input NOR-Function Logic Gate (1x)
> >> MC793P          3-Input NOR-Function Logic Gate (2x)
> >> MC830P          4-Input NAND-Function Logic Gate (10x)
> >> MC846P          2-Input NAND-Function Logic Gate (1x)
> >> MC894P          4-Bit Shift Register (2x)
> >> MC9820P  2-Input Multifunction Logic Gate (2x)
> >>
> >> Anyone seen these before? What in the world is all this? Are these some
> >> weird pre-TTL kind of technology? Would they be useful in anything now,
> >> i.e. could I interface them with the 74 series?
> >>
> >> After much googling I can't seem to find any actual datasheets.
> >>
> >> Oh, and there's piles and piles of transistors, that I'm just starting
> >> to sort, including a whole bunch of 2n299 germaniums.
> >>
> >> There's quite a few D29A4s and 2n3505... would those be of any use?
> >> (When I look at a transistor data sheet I don't really know what what I
> >> should be looking for...)
> >>
> >> - Aaron
> >>
> >> ------------------------------------------------------------------------
> >>-----
> >>
> >> Dr. Aaron Lanterman, Asst. Prof.       Voice:  404-385-2548
> >> School of Electrical and Comp. Eng.    Fax:    404-894-8363
> >> Georgia Institute of Technology        E-mail: lanterma at ece.gatech.edu
> >> Mail Code 0250                         Web:   
> >> users.ece.gatech.edu/~lanterma Atlanta, GA 30332                     
> >> Office: GCATT 334B
>
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