[sdiy] Help with Jupiter 8 clone

[Mattias Rickardsson]

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> 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> wrote:
>
> *citation required
>
> rob.
>
> On 2 Aug 2022, at 16:46, Josh Nursing via Synth-diy <
> 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>
> 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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>
> Rob Hukin
> Audiocircus Ltd
> 6 Blackstone St
> Blackstone
> Henfield
> BN5 9TH
> UK
>
> +44 7961 883 949
>
>
>
>
>
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