[sdiy] Help with Jupiter 8 clone
Roman Sowa
modular at go2.pl
Wed Aug 3 12:08:44 CEST 2022
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!
>>>
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>>>
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>>
>> Rob Hukin
>> Audiocircus Ltd
>> 6 Blackstone St
>> Blackstone
>> Henfield
>> BN5 9TH
>> UK
>>
>> +44 7961 883 949
>>
>>
>>
>>
>>
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