[sdiy] Ondes Martenot Schematics

[Michael E Caloroso]

Very cool, excellent work.

MC

On Fri, Mar 21, 2025 at 12:34 AM Mike Bryant <mbryant at futurehorizons.com>
wrote:

> The film trailer seems interesting.  Have you rented the film and is it
> worth paying to watch it ?
> ------------------------------
> *From:* Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Mike
> Beauchamp <list at mikebeauchamp.com>
> *Sent:* 21 March 2025 02:35
> *To:* synth-diy at synth-diy.org <synth-diy at synth-diy.org>
> *Subject:* [sdiy] Ondes Martenot Schematics
>
> 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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>
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