[sdiy] Help with Jupiter 8 clone

[Roman Sowa]

that's GP30, nod DG30, what was I thinking...

Roman

W dniu 2022-08-02 o 10:58, Roman Sowa pisze:
> 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!
>>
>> _______________________________________________
>> Synth-diy mailing list
>> Synth-diy at synth-diy.org
>> http://synth-diy.org/mailman/listinfo/synth-diy
>> Selling or trading? Use marketplace at synth-diy.org