RTL [was] Re: [sdiy] Just came across this...

[James Patchell]

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....as I remember, the HEP parts were $1.00 each...didn't seem to 
matter what you bought...although, I might be wrong about that price (it 
might have been more).  Still, it was not an easy thing for me to come up 
with the cash to purchase the parts...

At 12:10 PM 3/18/2004 -0800, Scott E. wrote:
>Fun stuff.
>
>This design used:
>
>MC799P Dual Buffer (1)
>MC791P Dual Flip-flop (3)
>MC724P Quad two-input gate (2)
>2N5129 NPN (6)
>2N5139 PNP (1)
>2N4871 UJT (1)
>2N4351 ??? (1)
>MPS6523 PNP (1)
>
>I think all the ICs are RTL stuff.
>
>If this eBay item does not work, all of my best to the buyer to find parts.
>
>Scott Evans
>----------------------------------------------------------------
>Grant Richter wrote:
>>I believe that would be Don Lancaster's "Psych-Tone" aleatoric synthesizer.
>>1971 sounds about right, and the contact paper was pictured in the original
>>article. A 32 stage PRSS with decoders, can't remember if it's TTL or CMOS.
>
>         -Jim
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