[sdiy] Help with Jupiter 8 clone

[Tom Wiltshire]

I wouldn't kill for those dog-slow envelopes though!

uPs have definitely improved since then.

T.

> On 3 Aug 2022, at 11:08, Roman Sowa <modular at go2.pl> wrote:
> 
> FWIW, Oberheim Matrix 12 and Xpander use badly designed SPSU
> yet everybody would kill for that sound
> 
> Roman
> 
> W dniu 2022-08-02 o 18:50, Mattias Rickardsson pisze:
>> 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/
>>>>            <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/
>>>>            <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!
>>>> 
>>>>            _______________________________________________
>>>>            Synth-diy mailing list
>>>>            Synth-diy at synth-diy.org <mailto:Synth-diy at synth-diy.org>
>>>>            http://synth-diy.org/mailman/listinfo/synth-diy
>>>>            <http://synth-diy.org/mailman/listinfo/synth-diy>
>>>>            Selling or trading? Use marketplace at synth-diy.org
>>>>            <mailto:marketplace at synth-diy.org>____
>>>> 
>>>>            __ __
>>>> 
>>>>            _______________________________________________
>>>>            Synth-diy mailing list
>>>>            Synth-diy at synth-diy.org <mailto:Synth-diy at synth-diy.org>
>>>>            http://synth-diy.org/mailman/listinfo/synth-diy
>>>>            <http://synth-diy.org/mailman/listinfo/synth-diy>
>>>>            Selling or trading? Use marketplace at synth-diy.org
>>>>            <mailto:marketplace at synth-diy.org>____
>>>> 
>>>>    _______________________________________________
>>>>    Synth-diy mailing list
>>>>    Synth-diy at synth-diy.org <mailto:Synth-diy at synth-diy.org>
>>>>    http://synth-diy.org/mailman/listinfo/synth-diy
>>>>    <http://synth-diy.org/mailman/listinfo/synth-diy>
>>>>    Selling or trading? Use marketplace at synth-diy.org
>>>>    <mailto:marketplace at synth-diy.org>
>>> 
>>>    Rob Hukin
>>>    Audiocircus Ltd
>>>    6 Blackstone St
>>>    Blackstone
>>>    Henfield
>>>    BN5 9TH
>>>    UK
>>> 
>>>    +44 7961 883 949
>>> 
>>> 
>>> 
>>> 
>>> 
>>>    _______________________________________________
>>>    Synth-diy mailing list
>>>    Synth-diy at synth-diy.org <mailto:Synth-diy at synth-diy.org>
>>>    http://synth-diy.org/mailman/listinfo/synth-diy
>>>    <http://synth-diy.org/mailman/listinfo/synth-diy>
>>>    Selling or trading? Use marketplace at synth-diy.org
>>>    <mailto:marketplace at synth-diy.org>
>>    _______________________________________________
>>    Synth-diy mailing list
>>    Synth-diy at synth-diy.org <mailto:Synth-diy at synth-diy.org>
>>    http://synth-diy.org/mailman/listinfo/synth-diy
>>    <http://synth-diy.org/mailman/listinfo/synth-diy>
>>    Selling or trading? Use marketplace at synth-diy.org
>>    <mailto:marketplace at synth-diy.org>
>> _______________________________________________
>> 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
> _______________________________________________
> 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