[sdiy] 5v ADV Bass / AD EG Question.

[Bill Berzinskas]

Hello everybody..  just woke up to a crazy little burst of snow here in NC..  wierd..   

Anyhow..   As you probably know i'm modding the bejezzus out of my adv-bass..   In my quest to make it digitally controlled, i've hit a few snags..  so maybe you can help me out.. 

1) I am converting it to digital control..  mostly thru digital pots..   a few things with DAC..  so.. for the digital pots, i have to use 5v input, and rather then use way more opamps then i want to deal with, i would like to make it operate on 5v possibly with a bipolar or just 12v output stage if necessary..   So.. 

I've done some crude experiments with the Trigger section just to see how it reacts to switching from +/-12v to just +5v..    I've tried with tl082s..  and i just can't get the trigger ratio right.. and it always triggers.. so.. since i broke down and got a few lm324s, i tried those.. and it seems to be working correctly..   i then went on and built the impact part using the digital potentiometers..   all good so far..   if i just switch all my opamps in the design, will it carry through the rest of the circuit properly? 

2)  I plan to use a digital potentiometer to control the decay time..   but the highest value i can come up with is 100k.. so i'm thinking i can change the capacitor and get about the same decay time?   any recommendations for a value? 

thanks guys!  :-) 
--billie
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