CEM3310s for sale

Haible Juergen Juergen.Haible at nbgm.siemens.de
Wed Nov 15 16:46:43 CET 2000


	>Yes, Juergen's core is truly amazing. I have built one of these, a
	>little after it was published. It works very well... but there are
lots
	>of trimmers in there which means it can take some room up on a PCB.
	>Maybe I can work something out to get rid of some of those, but I
think
	>many will have to stay if you are going to use this thing in a
	>polysynth. I know Jorgen redid the circuit for his cute little
	>Bergfortron with a few less trimmers.

The trimmers in the drawing are just to reflect the circuit I've built
for myself as closely as possible. It doesn't mean you need them (;->).
Some of them are not needed for tracking multiple units at all - they just
give an easy access to set your desired maximum times; Not *every*
application cries for several minutes time constants at the knob's end 
position.
Some other trimmers will just compensate the offset voltage of the
transistor
pairs. It's the usual choice: expensive matched transistors, or a little
bit of trimming. Nothing specific to that multiplier core.

	> If I do a discrete
	> version, I'll probably sell a few PCBs on my site to cover some of
the
	> costs and buy Juergen a few beers :-).

Not really interested in beer, but I appreciate exotic sorts of Green tea
(;->).
My local supplier doesn't get Chinese Emai Szechuan Green anymore :-(

JH.



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