[sdiy] Yet Another ADSR

[Scott Gravenhorst]

http://home1.gte.net/res0658s/fatman/ADSR3b.html

It may have been done like this before, but I've never seen it.

One 4069UB does all the logic.  A TL0xx OpAmp as a buffer. 
As it is, the circuit outputs an ADSR waveform that peaks at
1/2 Vdd.  Gain could be added to the buffer to raise the
output.  Another amp from the package could provide an
inverted waveform.

The circuit actually works without the opamp, but I think
it's more useful with a buffer.

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-- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
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