[sdiy] Help with Jupiter 8 clone

[Mike Bryant]

Yeah there’s a lot of crap SMPSes out there – just look at the output of any USB charger.  But ridiculous to even the compare the concept with linear designs, which of course are illegal now in some countries as they are so bad.

I remember the first 19” 2U kiloWatt amps were treated with scepticism as they used off-line rectification followed by huge reservoirs and then the switching, but they soon dominated driving bass bins because there was no sag – the boost-buck switcher sucked any energy left in the reservoirs no matter what voltage it was at and converted it to the amps DC rails.

From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of Mattias Rickardsson
Sent: 02 August 2022 17:51
To: Tom Wiltshire
Cc: Synth DIY
Subject: Re: [sdiy] Help with Jupiter 8 clone

Maybe it's possible to find some of those interference problems if you combine an old or unrefined SMPS design with the old original unshielded JP-8 PCB layout, but as a general "truth" it sounds quite false. :-)

/mr

Den tis 2 aug. 2022 18:23Tom Wiltshire <tom at electricdruid.net<mailto:tom at electricdruid.net>> skrev:
+1 agree with Rob, evidence is definitely required for for such a bold claim.


On 2 Aug 2022, at 16:51, rob hukin <rob at audiocircus.co.uk<mailto:rob at audiocircus.co.uk>> wrote:

*citation required

rob.


On 2 Aug 2022, at 16:46, Josh Nursing via Synth-diy <synth-diy at synth-diy.org<mailto:synth-diy at synth-diy.org>> wrote:

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<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.


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

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<mailto: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<mailto: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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Rob Hukin
Audiocircus Ltd
6 Blackstone St
Blackstone
Henfield
BN5 9TH
UK

+44 7961 883 949




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