[sdiy] ASM1 VCO single sided PCB design tests OK

[Magnus Danielson]

From: <synth at charlielamm.com>
Subject: [sdiy] ASM1 VCO single sided PCB design tests OK
Date: Fri, 18 Apr 2003 16:13:19 -0700 (PDT)

Hi Charlie Brown!

> Minor note:  I have now tested and retested my "final" design for a
> single-sided PCB based on the ASM-1 VCO design. Yep, it works.

Great to hear!

> http://www2.charlielamm.com/synth/#asmvco

In your webpage:

"You will need matched PNP for Q1" it should naturally say NPN!

> Thanks again to everyone in the group for all the help esp. Magnus for his
> invaluable help putting together a calibration procedure.

Well, it seems that it's my contribution to the field. Not a major one, but
atleast a few people will enjoy it. Derivates of the ASM-1 VCO, including the
ongoing revision seems to have taken this particular mod to it. ;O)

Please note that I chose the trimming frequency to be a note which you could
get out of more or less any keyboard.

As for power-supply, the actual VCO core doesn't care frequency-wise about
which voltage there is, but the CV-input side will. If you have a frequency
pot reaching for -15 V (which it usually is) then you will have dependencies
right there. A +15V to GND pot will however probably be safe (recall, it is
years since I did the actual calculations myself).

BTW, I had good old Anders Sponton calling me today and he also came over for a
quick swap of items (I borrowed the second Formant book from him and he had
some photos of my equipment and also the manual to my Neumann RUMS-77 rumble
meter - lacking the record thought). In a good mood like always. ;O)

Cheers,
Magnus