[sdiy] Help with Jupiter 8 clone

[Roman Sowa]

Hi,
first of all - good luck with it!

You will have a chance to make it better than Roland did. Because when 
you look closer, the synth is made like "let's make it playable for the 
NAMM show, there's entire 3 days left you can do it!".
I mean power distribution, especially lack of any care for GND, hundreds 
and hundreds of trimmers everywhere, and numerous engineering changes 
after release. It can be done better even without changing the circuit.

As for Hi-Fi diodes in power supply, they are there only to prevent 
reversed voltage on power rails during power up/down. Any diode will do. 
And besides, this diode, DG30 is still made today, available from stock, 
although possibly in different voltage rating, which does not matter here.
Key specs are low leakage current (<0.1uA) and high forward surge 
capacity (125A). Although today you could find Shottky diode better 
suited for this.

Why they were called Hi-Fi? My guess is that the guy drawing those large 
and endless schematics, in a moment of weakness, wanted to include some 
joke that only him and few others in the company would understand.

Roman

W dniu 2022-08-01 o 19:57, Luís Marka via Synth-diy pisze:
> Hi guys,
> 
> I am giving a serious thought about building a Jupiter 8 clone, and 
> started to take a deeper look at the schematics (actually I already 
> ordered some of the parts, so it looks like I will get it done 
> eventually). In the PSU there are three GP-30G diodes tied at the -15, 
> +15 and +5V outputs, listed as "Hi-Fi Special" both in the schematics 
> and in the parts list. I never heard anything about a "hi-fi special" 
> diode, any idea what that means??
> 
> Cheers!
> 
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