[sdiy] VCO Problems

[Gene Stopp]

The ASM-1 was designed while running +/- 12v, then optimized for +/- 15
later. So yes it will run on bipolar 12 volts. It will probably go even
lower, like bipolar 10, but I haven't tried that and some component values
would probabaly have to change to keep things like VCO scales correct. But
12 volts is fine!
 
Other than that I can offer no advice - I really appreciate the comment
about challenges because that's how I got started! My original PCB's for the
Electronotes ENS-74 from Wasatch Music were a mess when I first built them.
(I remember trying to figure out how a portamento circuit worked. I though
that if you ran audio through it then portamento would be added to the
music!!!) Anyway my VCO's were blobs of solder on the bottom and flux
everywhere and overheated chips and so on. But I was possessed by the need
to have a working synthesizer so I kept at it. The stuff I played with in
the music stores was just too bitchen to believe. I remember Springfield
music in Northridge CA had a Mini Korg and a Synthacon.... changed my
life...

Best Regards,

- Gene


-----Original Message-----
From: Juho Lepistö [mailto:juho.lepisto at pp.inet.fi]
Sent: Saturday, December 08, 2001 7:57 AM
To: Diy
Subject: [sdiy] VCO Problems




I bet I'll get loads of "What did I said" messages.
Ok... My ASM VCO is silent. I've checked the connections and transistor/fet
polarities. Everything seems to be ok but still I don't get any signals out.
I'll get -8V out from saw output and -2V out from pulse output. I think the
problem might be my 12V power. I know that ASM is for 15V. Does ASM work
with 12V without component changes or do I have to change any component
values or is my project doomed?
 
P.S. Answer is still no. I don't want to buy kits even this is tough. I like
challenges.

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