[sdiy] Help with Jupiter 8 clone

[rob hukin]

*citation required

rob.

> On 2 Aug 2022, at 16:46, Josh Nursing via Synth-diy <synth-diy at synth-diy.org> wrote:
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> 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.
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> And before you start telling me about filtering the output of them, that does absolutely nothing for the mains-side noise.
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> Effects on audio are across the board - all audio frequencies suffer, and it's probably more noticeable in loss of bass frequencies.
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> On Tue, Aug 2, 2022 at 11:41 AM Mike Bryant <mbryant at futurehorizons.com <mailto: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.
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> From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org <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
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> I really don't like the idea of replacing the linear PSU in those vintage synths with a SMPS one. Audio suffers.
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> On Tue, Aug 2, 2022 at 7:45 AM Adam (synthDIY) <synthdiy at adambaby.com <mailto:synthdiy at adambaby.com>> wrote:
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> Luís, I assume you’re aware of this
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> https://synthronics.de/roland-jupiter-8-new-psu/ <https://synthronics.de/roland-jupiter-8-new-psu/>
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> and this guy, who has been ominously quiet of late
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> https://jup8restoration.wordpress.com/2019/10/22/new-power-supply-being-manufactured-for-a-jupiter-8/ <https://jup8restoration.wordpress.com/2019/10/22/new-power-supply-being-manufactured-for-a-jupiter-8/>
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> A
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> On 2 Aug 2022, at 3:57 am, Luís Marka via Synth-diy <synth-diy at synth-diy.org <mailto:synth-diy at synth-diy.org>> wrote:
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> 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??
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> Cheers!
> 
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Rob Hukin
Audiocircus Ltd
6 Blackstone St
Blackstone
Henfield
BN5 9TH
UK

+44 7961 883 949





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