MATRIXSYNTH: Sound Semiconductor Announces New SSI2131 VCO

Wednesday, January 13, 2021

Sound Semiconductor Announces New SSI2131 VCO

New chip derived from Sound Semiconductor's previously announced SSI2130 to provide only the core VCO function for lower cost and easier use.

The press realese:


Provides Core VCO Function for Ease of Use and Low Cost

January 13, 2021 – Sonora, California – Sound Semiconductor today announced an addition to its family of Voltage Controlled Oscillator (“VCO”) integrated circuits.

The SSI2131 offers basic VCO functionality with buffered triangle, sawtooth, and variable-width pulse outputs. Like the previously introduced SSI2130 VCO, special care was taken to provide unprecedented levels of temperature stability, exponentiality, and waveform integrity but in this case the on-chip mixer, sine shaper, and through-zero components were omitted. The result is a modern, high-performance basic VCO that is extremely easy to use.

Offered in a 16-pin small-outline DIP package, only a handful of external components are necessary. Like the SSI2130, exponential setup is easily accomplished by use of fixed-value resistors for less demanding applications, and manual or CPU calibrated for exponential conformance to one cent over a ten-octave range. Both soft and hard sync are available. Pricing is $1.40 at 1k pieces, with samples available now to qualified OEM’s. Production stock will be available by late February; at that time hobby and DIY enthusiasts will be served through Sound Semiconductor’s growing network of authorized resellers.

"Ever since building my first synthesizer in college I’ve been imagining this VCO project,” stated Derek Bowers, designer of the SSI2130 and SSI2131. "I’m really happy with results of these developments."

Sound Semiconductor is composed of musicians and technologists with the goal of developing affordable, high- performance integrated circuits for music creation. For more information, please visit"

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