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From the MAKE Flickr pool

Matt the Modulator shares some key solder points on the SX-150 analog synth PCB, allowing for –

  • envelope triggering

  • frequency to voltage output
  • self oscillating filter
  • LFO to filter cuttoff

To see the specific points in question, check out the photo’s notes on Flickr. He also points out that the SX-150 can be easily controlled via the output of a Gakken Mini-Theremin kit –


The gakken theremin can be used to control the SX-150 which has a much better tone and a LFO for that Violin / cello effect. The ext input of the SX-150 is a Frequency to voltage converter and so any synth can be used to control the pitch of the SX-150 but a signal with a high amplitude is needed (about 3v+)

I too have used these in combination and can attest to their awesomeness =]

In the Maker Shed:
SX-150 Analog Synthesizer Kit & Mini-Theremin

Collin Cunningham

Collin Cunningham

Born, drew a lot, made video, made music on 4-track, then computer, more songwriting, met future wife, went to art school for video major, made websites, toured in a band, worked as web media tech, discovered electronics, taught myself electronics, blogged about DIY electronics, made web videos about electronics and made music for them … and I still do!

  • Marc de Vinck

    The SX-150 will be back in stock any day. (I expect them to be in this week) I will make a post when they are since so many people have been asking.