ASM-1 Life

[gstopp at fibermux.com]

     It really does sound like a power supply issue, at least so far... 
     does that HP power supply have a current limit knob? If so, crank it 
     to max current. There's no problem in doing that, if all connections 
     are OK. The ASM will only take what it needs.
     
     Otherwise, make sure that you're using fairly big wire for power. 
     Skinny wire carrying current causes voltage drops. Any impedence in 
     the power lines other than 0.0 ohms may cause circuit interactions. 
     I've used 24 gauge solid (LAN UTP cable), but it would be better to 
     use 14-18 gauge if it's handy.
     
     Also - you did include all of the bypass caps, right? They should be 
     around 0.1uF each, or 0.22, or something larger than tiny and smaller 
     than huge.
     
     - Gene
     gstopp at fibermux.com


______________________________ Reply Separator _________________________________
Subject: ASM-1 Life
Author:  Dave Fulton <dfulton at kopb2.opb.org> at ccrelayout
Date:    3/19/97 12:45 AM
     
1) The LED I added to the LFO appears to effect the pitch of the OSC. 
2) AS does the ones I added to the ADSR's.
     
I added the LFO LED in the fashion the was suggested by Gene in the ASM 
docs, the LED's monitoring the gate inputs were added based on Chris List's 
plans. I quickly changed the 3.3K to 10K (As I did to the Gate LED's) & 
reduced the effect. When I noticed that the pitch of the OSC's were 
modulating the filter cutoff. Starting to sound like a Power Supply problem?