[sdiy] sds800 envelopes fixed!

[gregory zifcak]

oh, i forgot to mention that i have also decreased the minimum decay time by 
decreasing the 470k resistor in line with the decay pot to 150k (the same 
value as the snare's). these two mods combined make it so you can actually 
get tight percussion sounds from the sds800 (and 400 and 200).


>thanks to steve ridley:
>
>in the original simmons design, the decay capacitor doesn't get fully 
>charged at short decay times, dramatically reducing the volume of tighter 
>percussion sounds. by inserting an emitter follower, the problem is 
>corrected.
>
>1. remove d4
>
>2. connect the base of a npn transistor (i used 2n4401) to ic5 pin 8 
>(output of trigger extracter).
>
>3. connect collector of npn to +5v (i used ic5 pin 4).
>
>4. connect emitter of npn through a 10 ohm resistor to + side of c3.
>
>voila, snappy envelopes (finally)!
>
>greg
>
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