Analog Synthesizer Module
Other names for this product: ASM1, ASM 1,
Courtesy/Thanks to: Gene Stopp
Description: Please Observe! The ASM-1 PCB is discontinued and is replaced by the ASM-2 PCB.
The ASM-1 is a DIY analog synthesiser created by Gene Stopp and was derived from
a number of Electronotes projects submitted by Terry Mikulic and Bernie Hitchins.
The ASM-1 design brings together the basic modules for a classically
configured synthesiser on a single pcb.
Although on a single pcb, each module is fully self-contained with only the power rails common to all modules. This allows the user the freedom to use the ASM-1* in any type of design desired, from a small pre-patched unit to a fully modular system.
(words by Laurie Biddulph who runs a DIY site in Australia and also sells premade PCB's for the ASM-1 and ASM-2 Synthesizers).
The ASM-1 Analog Synthesizer Module was created for a few reasons:
- I wanted to build a manually-patched polyphonic analog music synthesizer for
my own use, having given up hope of finding an old Oberheim 8-voice for a couple
of hundred bucks. Making a circuit board for each voice is only marginally
crazzy - making the whole thing on vectorboards would be totally crazy. I'm only
- If i did make a circuit board, I could make extra ones and sell them to
synthesizer builders, to help pay for the rather expensive PCB setup costs at
the local shops.
- I like to design circuit boards.
standard arrangment of traditional analog synthesizer modules, in what can be
considered a compromise between simplivity and usefulness. The circuit sections
- 2 Voltage Controlled Oscillators (VCO's)
- Sawtooth and variable rectangular outputs
- 1 Voltage Controlled State Variable Filter (VCF)
- Lowpass, bandpass, highpass and notch outputs
- 2 Voltage Controlled Amplifiers (VCA's)
- Linear response
- 2 ADSR Envelope Generators
- Exponential curves
- 1 Low Frequency Oscillator (LFO)
- Triangle and square outputs
- 1 Noise Source
- White, pink and random outputs
- 1 CV Glide Buffer
- Linear or exponential glide
modular synthesizer sence, since they are not interconnected in any way on the
circuit board other than by power and ground busses. Therefore the builder has
the freedom to use the ASM-1 in any type of design desired, from a small
pre-patched expander module to a fully patchable semi-modular system.
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