[sdiy] Help with Jupiter 8 clone

[Josh Nursing]

SMPS are the most polluting/noisy PSUs for audio purposes. Lots of
high-frequency current spikes affect both downstream circuits and the mains
they're connected to.

And before you start telling me about filtering the output of them, that
does absolutely nothing for the mains-side noise.

Effects on audio are across the board - all audio frequencies suffer, and
it's probably more noticeable in loss of bass frequencies.

On Tue, Aug 2, 2022 at 11:41 AM Mike Bryant <mbryant at futurehorizons.com>
wrote:

> How can audio suffer from putting a PSU in with 100 times better
> performance ?    No 50/100Hz at all and general noise almost zero.  And
> it’s far less heat so everything else runs cooler and better.  I think too
> many people see the noise from their phone charger or whatever and assume a
> proper SMPS is like that.
>
>
>
>
>
> *From:* Synth-diy [mailto:synth-diy-bounces at synth-diy.org] *On Behalf Of *Josh
> Nursing via Synth-diy
> *Sent:* 02 August 2022 16:35
> *To:* Synth DIY
> *Subject:* Re: [sdiy] Help with Jupiter 8 clone
>
>
>
> I really don't like the idea of replacing the linear PSU in those vintage
> synths with a SMPS one. Audio suffers.
>
>
>
> On Tue, Aug 2, 2022 at 7:45 AM Adam (synthDIY) <synthdiy at adambaby.com>
> wrote:
>
> Luís, I assume you’re aware of this
>
>
>
> https://synthronics.de/roland-jupiter-8-new-psu/
>
>
>
> and this guy, who has been ominously quiet of late
>
>
>
>
> https://jup8restoration.wordpress.com/2019/10/22/new-power-supply-being-manufactured-for-a-jupiter-8/
>
>
>
>
>
>
>
>
>
> A
>
>
>
> On 2 Aug 2022, at 3:57 am, Luís Marka via Synth-diy <
> synth-diy at synth-diy.org> wrote:
>
>
>
> 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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