[sdiy] Ondes Martenot Schematics

[Adam (synthDIY)]

Great work Mike!

> On 21 Mar 2025, at 12:35, Mike Beauchamp <list at mikebeauchamp.com> wrote:
> 
> I'm really happy to share this with the synth-diy community, as these schematics are something I have been searching the internet for over the last 14 years.
> 
> http://ondes.net/
> 
> I have been collecting all of the information I can find on the Ondes Martenot for quite some time. Although there were rumours of people having copies and one being briefly shown in the film "Wavemakers" (https://www.nfb.ca/film/wavemakers/), actual schematics seemed totally unobtainable.
> 
> Several years ago, I reached out to a man named Jean Landry who had been a repair technician and also worked and taught at the Conservatoire de musique de Montréal, which as far as I know is the only place that teaches the Ondes Martenot in North America. During a visit to his modest repair atelier, he pulled out several original schematics from his filing cabinet and very kindly offered to scan them for me.
> 
> Once I saw the schematics, of course I started simulating and breadboarding the oscillator core, waveshapers and mixing circuitry. After making some improvements to the stability of the oscillator, I designed the Therevox Ondes VCO for eurorack as a side project during the development of the ET-5.
> 
> Jean continued to scan and organize more documents he had related to the Martenot, including original operating manuals, technical bulletins and everything else he could find. Jean and I are both former guitar amp repair techs, and we talked about how vintage Fender amplifiers will be around forever because their schematics were always top-notch and available. Jean wanted his Ondes Martenot information to be available on the internet so it might help others repair the few Ondes Martenot instruments that are left in the world. He did most of the work, I'm just a guy that knows a bit of html and happy to finally put this stuff online.
> 
> Mike
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