via this auction
"A very raw sine wave is produced from this Oscillator, It can go very very low to very very high with a switch for increments sine and saw option and some color coding for notes.
The switch sine and saw can do things on the fly and make interesting sounds.
A have never used the XLR connections so don't know much about them,
I have always used it with the 3.5 Mini jack that is connected that works fine.
Comes with variable PSU.
I have also made a simple trigger box to cut the signal from the synth in and out so you can play notes. A simple OSCILLATOR in and then out to amp or computer or what ever you are putting it thru, the toggle switch above the buttons can have the the signal coming thru for a constant tone or toggle it to use the switch cut in and out. The switches are cool smokey grey translucent Arcade buttons that I specially ordered in.
Please note only one switch is needed and working and the other one is a spare that could be hooked up with another synth at a latter date.
I have also included a keyboard map of colours.
The synth is great fun....and with a bit of delay and Reverb you can get some great risers and shuddering drops, and general madness out of this little synth..."
This is the first SeeSure post.
I own one of these, they are cheap and cheerful but the waveforms are quite good as long as you don't clip it. They were made in the late 1970s to early 1980s for educational use. The XLRs and power jack on the one in the photo aren't original and have been added. The sine and saw are pretty consistent on mine, though there is a weird lag if you turn the frequency up too quick. It is a basic discrete circuit using 5x 2N3702 / 2N3707 transistors and an RS tempco thermistor, no ICs used! I'd advise changing both the electrolytic caps inside (470u/16v and 47u/10v) for stability as the frequency tends to drift if they are out of spec.
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