Arp Quartet cheap?

Ingo Debus debus at
Fri Nov 5 16:11:03 CET 1999

Harry Bissell wrote:
> Its no secret whats inside the top octave generator... its just digital dividers
> that have the 12th root of 2 relationship to each other. If anyone has the data
> sheet it will tell what the division ratios are... A PLA FPGA etc could do this, or
> even good old CMOS logic.

There was an Elektor project in 1974 that did just this. Only TTL and
trannies, 46 ICs! They had a version with a TOS IC as well. I built that
back then.


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