Lupine Systems First Vintage DIY Analog Synthesizer For Sale

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via this auction

Here's an interesting bit of DIY synthesizer history. The only other post to mention Lupine Systems went up last October here. Below are the details from the auction including a link to an audio demo. Note there is a Lupine Systems website still online.

Details via the auction:

Hello DIY synthesizer fans! Way back in the 1970's I designed a number of synthesizer systems. Many of them were basic but for the time they were quite impressive.

I used to build small devices while in school to impress my friends. I often gave away copies of the diagrams, many of which I have seen online in one form or another -- many are very simple in nature and have survived the many years. This design is a hybrid -- the keyboard is digitally scanned but the audio is generated by analog circuits. This combo allows for the use of a matrixed keyboard. The heart of the system is the M50240 Top Octave Generator chip for which the output is divided down to lower frequencies and blended to form the sound to be processed by the filters.

Up for auction is a copy of one of my original synthesizers. The original was built using pad-per-hole and point-to-point wiring. I decided a while back to draft a set of printed circuits for this design "just for the heck of it". Up for auction are the results.

The PC board had a few drafting errors which have been professionally corrected with jumpers (a corrected version is now available but not yet up for auction).

All controls are fully functional and since the photos were taken I have added knobs to all of the rotating controls. I have also added a 1/4" phone jack for the audio output mounted on the rear (not shown).

PLEASE NOTE: THE AUCTION IS FOR THE SYNTHESIZER PC BOARD SET, NOT THE KEYBOARD SHOWN. The keyboard IS HOWEVER INCLUDED. The keyboard is CHEAP and is not of high quality so it is being TOSSED IN WITH THE AUCTION to get you started. Note in the photos that one key has been replaced and does not truly match the rest but plays OK. IT IS HIGHLY RECOMMENDED YOU REPLACE THE KEYBOARD WITH A DECENT ONE rather than rely on this toss-in.

Schematics are included with this auction.

If you would like to hear some of the sounds this keyboard makes you can Click Here for a wav file of the sounds."