[sdiy] Hohner Electronic Piano

[dragon.servicing]

Hi,
I think that the idea of the design might be similar to the Crumar 
Compac Piano.
there was I think also a Hohner international  string machine ?
I think there is only one filter used for each sound over the whole 
keyboard.
an interesting piece of keyboard history.
regards Peter


Gregtronic wrote:
> Hey all.  I just got a Hohner International Electronic Piano.  It has 
> two sounds which are piano and harpsichord which both sound cool 
> especially when you mix them together.  Also it has a nice vibrato 
> function which has control over the speed.  Of course the moment i got 
> this, my mind starts wandering to cool ways i could mod this.  It would 
> be great if i could access the filter(s) to add controls, the vibrato so 
> i could adjust depth, and if i could modify the envelope.  The first two 
> mods would be simpler than the envelope mod.  Because the synth uses 
> frequency dividers, there's an envelope for each individual note.  But 
> i'm thinking if i could just got a constant sustain signal, i could use 
> a volume pedal and have a pretty sweet string synth.  That, added with 
> the controls for the filter and vibrato.
> 
> Of course, without the schematics i'm pretty much hopelessly lost at 
> this point, as i have never even attempted to reverse engineer anything, 
> so i'm saving that for my last possible choice.  Does anyone happen to 
> know if there are schematics or a service manual around for these?  
> There's not much information on the internet as it is about these guys.  
> Also, are my mods even realistic/possible/worth it?  Any help or 
> information anyone has would be greatly appreciated.
> 
> Cheers!
> 
> -Gregory
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