[sdiy] Weird old logic chips & transistors

[Scott Gravenhorst]

Oh yeah, the distortion.  The CMOS ones do a soft clip thing.

harrybissell <harrybissell at prodigy.net> wrote:
>You are correct.  They 'can' be run just like the 4069UB.  That was how Craig
>Anderton did the fuzz box on the Timbre Gate project.  When analyzing the design
>(with my dad) he said I should 'remove the diodes' because they would 'clip the
>shit'
>out of the signal. When I told him that was my intention, he went ballistic... "get
>out
>of here you little bastard, I work all day trying to get RID of distortion and here
>you are trying to make it on PURPOSE ???
>
>I might have the schematic, still. It was horrible and noisy, a 741 would be WAY
>better.  I would not bother with RTL for linear use. If you had the data sheets,
>they
>would show you the resistor values inside and you could just use transistors.
>
>H^) harry
>
>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.
>>
>> 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
>> >
>>
>> ---------------------------------------------------------
>> - Where merit is not rewarded, excellence fades.
>> - Hydrogen is pointless without solar.
>> - What good are laws that only lawyers understand?
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>>
>> -- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
>> -- Linux Rex         | RedWebMail by RedStarWare
>> -- FatMan: home1.gte.net/res0658s/fatman/
>> -- NonFatMan: home1.gte.net/res0658s/electronics/
>> -- Autodidactic Master of Arcane and Hidden Knowledge.
>

---------------------------------------------------------
- Where merit is not rewarded, excellence fades.
- Hydrogen is pointless without solar.
- What good are laws that only lawyers understand?
- The media's credibility should always be questioned.
- The only good terrorist is a dead terrorist.
- Governments do nothing well, save collect taxes.

-- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
-- Linux Rex         | RedWebMail by RedStarWare
-- FatMan: home1.gte.net/res0658s/fatman/
-- NonFatMan: home1.gte.net/res0658s/electronics/
-- Autodidactic Master of Arcane and Hidden Knowledge.