JH-4 - first voice is finished !

Haible Juergen Juergen.Haible at nbgm.siemens.de
Tue Jun 10 11:56:46 CEST 1997

Finally, it's finished.
The first voice of my own 4-voice polyphonic synth.
Making a SEM-architecture fully voltage controlled, plus adding
features such as 4-pole filter with morphing, VC LFO, cross modulation,
VC panning,
morphing LFO waveforms, and a few more goodies had its price: 
This one voice is built on 4 double-euro cards (20cm x 15cm), and it
uses 170 discrete transistors, two transistor arrays, 40 opamps and 27
No CEM or other rare and expensive chips, though. And it's very compact,
the four cards stacked on top of each other, connected with two ribbon
and all potentiometers and switches soldered directly into the top
board. No
free wires and such. When I want to add patch storage one time, I only
have to
disconnect the ribbon cable from the potentiometer board and add a
board in between.
I have posted some details before, when the module was in progress.
Maybe I'll
write a summary of the whole thing, when I find the time. I don't have a
front panel
yet, and maybe I will redesign the potentiometer board for different
type of switches.
But first, I need some weeks to rest. (;->)


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