[sdiy] Op-amp to boost VC signal with +5V/GND?

[David G. Dixon]

> Many classic synths use CMOS (4000 series) and 12 or 15 volt supples,
> which would
> require a gate voltage of between 6 to 7.5V minimum to trigger, possibly
> more if
> a schmitt trigger gate was used.
> 
> 5V is too low for a good gate imho. I think the 10V level would be best.

OK, guys, point taken!  I guess it's a good thing that my synth has gate
inputs all set to ~2V!