Dear Arnaud,

this is an interesting story! My French is not that good to understand everything, but roughly I made it. Why did you change the values of the capacitors of the oscillator circuit first time?

Take a look at the Mysticum project - this might be interesting for you! Unfortunately it's all in German but take a look at the drawings below "Technische Dokumentation - Schaltplan..."!

https://www.schach-computer.info/wik...x.php/Mysticum

Regards, Michael

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Es ist besser, die Steine seines Gegners zu opfern. (S.G. Tartakower)