My Do-It-Yourself ASM-1 project

The ASM-1 circuit was layed out by Gene Stopp and the ASM-1 front panel was designed by Christopher List. For more information, look at the archives of the Synth-DIY mailing list. I have 4 circuit boards, but I've only finished 2 of them. The second ASM-1 uses a panel design by Ric Miller and myself. It utilizes nearly all of the inputs of the ASM-1 board. The ASM-1 has 2 VC Oscillators, 1 LFO, State Variable Filter with manual Q and Cut-off, 2 VCAs, 2 ADSR Envelopes, 1 Lag Generator. If you are just starting to build an ASM-1, check here for some trouble-shooting tips. If you were not on Synth-DIY when Gene introduced the ASM-1, check out my selected archives on the ASM-1 (04/96 to 12/96).

Troy Sheets' Parts List with Mouser Part Numbers. Please verify these part numbers for yourself.

Here are some examples of how the ASM-1 / MOTM /A.R.F combination sounds.

VCO2 -> FM of VCO1, VCO1 and an LFO into A.R.F. Timbre Modulator (696K WAV)
This sound used a single ASM1, with 2 VCOs and an LFO going into the Timbre Modulator.

• ADSR1 as DSR for the VCA
  
• ADSR2 as Decay Envelope (DE)
  
• VCO1 with CV and 33% of DE,
  tune VCO1 to an audible pitch, kind of low
  Saw out to +Sync on CEM3340
  
• VCF1 with 50% of DE into the cutoff,
  set Q to 85%,
  output 90% LPF, 10% HPF
  

• CV patched in
  
• But pitch controlled by VCO1 Saw patched to +Sync
  
• Saw out to VCF audio In
  

Here is a picture of my modular rack.

Last modified: Wednesday, March 24, 1999

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