If by trigger input you mean a very short, fixed-width pulse... why not build a CGS24 or two?
(and don't make the same dumb mistake I made, installing a TL072 in place of the LM358 specified by Ken. Thankfully the pinout is the same!)
John
On 24 January 2018 at 09:34, Mike Burnham mikejburnham@... [cgs_synth] <cgs_synth@yahoogroups.com> wrote:
I have built the programmer with 16 steps. it works fine but the trigger output is quite low in amplitude and very short.
Is this true to the design or some kind of fault in my assembly?
I don't have any envelope generators that take a trigger input so its very difficult to shape a useable envelope.
Thanks
Mike