[sdiy] ens 76 eg 1...

[Grant Richter]

The Electronotes circuit assumes the trigger pulse is high for only 50 uS.
You need to put a 0.001 uF (1000 pF) cap in series with the trigger input.
You probably have the trigger DC coupled and that is preventing correct
action of the SR flipflop.

> From: "G. Russom" <elmystico at earthlink.net>
> Date: Thu, 21 Feb 2002 01:45:12 -0500
> To: synth <synth-diy at dropmix.xs4all.nl>
> Subject: [sdiy] ens 76 eg 1...
> 
> I built the electronotes eg 1 from ENS 76.  OK... the D, S, and R stages
> work properly.  But the Attack stage only works the first time i turn on the
> synth... after that it switches to a DSR envelope.  weird...  We are working
> with an RS flip flop here built from two crossed NOR gates.  When the
> trigger triggers it should send NOR gate A low which in turn send NOR gate B
> High and flips the analog switch letting the voltage through the attack pot
> and onto the envelope capacitor.  But it only works once or twice.  I'm
> using the same signal from an LFO for the TRIG and GATE.  Is this signal too
> long for the trigger?  Anybody run into anything like this?
>