Here is a MOTM-110 VCA under same conditions. The vertical scale is really 200mv/div (not 20mv/div, I used a different probe). The 'noise' on the signal is due to the scope's 8-bit AD converters (it does sample at 2G/sec!). Hmmm...maybe I need to charge $600? Paul S.
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MOTM VCA
2000-11-01 by Paul Schreiber