[sdiy] [spam] Re: Pink Tunes self-composing program.

KA4HJH ka4hjh at gmail.com
Wed Jan 10 04:00:46 CET 2018


> On Jan 9, 2018, at 9:08 PM, David Manley <dlmanley at sonic.net> wrote:
> 
> I can confirm the DAC was exponential, it used a custom resistor network from ??? (insert major US manufacturer of resistor networks - can't recall right now it was in a light blue ceramic package).  From memory there's nothing to the QuASH but a 8-bit register to latch the micro writes plus an analog switch demuxing the 'DAC' output to simple capacitor plus TL0xx output buffers.  I may still have Simonton's published lab notes somewhere.


I recall something about a "laser trimmed" resistor network.


Terry Bowman, KA4HJH
"The Mac Doctor"




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