[sdiy] Help with Jupiter 8 clone

[Mike Bryant]

Are you implying that our Aussie friends have problems in the common sense department ? :-)


From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of mark verbos via Synth-diy
Sent: 03 August 2022 10:17
To: Doug Jackson
Cc: Synth DIY
Subject: Re: [sdiy] Help with Jupiter 8 clone

Maybe these are correcting an exclusively AU/NZ problem, given that they only come with that connector?





On Aug 3, 2022, at 8:40 AM, Doug Jackson <doug at doughq.com<mailto:doug at doughq.com>> wrote:

I think that SMPS output quality is likely to be dependent on the power sfeed to it.

I will only use a SMPS if I can use my "IsoTek EVO3 Premier Power Cable" -  Remember that last 1.5m makes *all* the difference.   As the sales pitch says, the Premier’s pure, clean power flow is a perfect introduction to the experience of IsoTek, and the impact of high-performance cables on your audio experience.  I'm totally swayed.

:-)


Click at your own peril.  What has been seen can never be unseen https://www.melbournehifi.com.au/products/isotek-evo3-premier-power-cable?variant=16844597362739&currency=AUD&utm_medium=product_sync&utm_source=google&utm_content=sag_organic&utm_campaign=sag_organic&gclid=CjwKCAjwlqOXBhBqEiwA-hhitF43XxewLMF3Ne2wQ00zBB1UehbmQpfeyVeirgc0zMyRNwXyxtx_OxoCq5sQAvD_BwE


Kindest regards,

Doug Jackson

em: doug at doughq.com<mailto:doug at doughq.com>
ph: 0414 986878

Check out my awesome clocks at www.dougswordclocks.com<http://www.dougswordclocks.com/>
Follow my amateur radio adventures at vk1zdj.net<http://vk1zdj.net/>

-----------------------------------------------------------
Just like an old fashioned letter, this email and any files transmitted with it should probably be treated as confidential and intended solely for your own use.
Please note that any interesting spelling is usually my own and may have been caused by fat thumbs on a tiny tiny keyboard.
Should any part of this message prove to be useful in the event of the imminent Zombie Apocalypse then the sender bears no personal, legal, or moral responsibility for any outcome resulting from its usage unless the result of said usage is the unlikely defeat of the Zombie Hordes in which case the sender takes full credit without any theoretical or actual legal liability. :-)
Be nice to your parents.
Go outside and do something awesome - Draw, paint, walk, setup a radio station, go fishing or sailing - just do something that makes you happy.
^G ^G ^G ^G ^G ^G ^G ^G- In more laid back days this line would literally sing ^G ^G ^G ^G ^G ^G ^G ^G



On Wed, 3 Aug 2022 at 09:55, Chromatest J. Pantsmaker via Synth-diy <synth-diy at synth-diy.org<mailto:synth-diy at synth-diy.org>> wrote:
My day job is as a Chief Engineer for some FM radio stations.  Our FM transmitters use SMPSUs.  In fact, my 40KW fm transmitter has 32 switch-mode power supplies in it (there's a fair bit of redundancy).

If switch mode power supplies can push out FM radio signals at an effective radiated power of 100,000 watts without spurious emissions, I think they can be made pretty clean.

On Tue, Aug 2, 2022 at 10:25 AM <rburnett at richieburnett.co.uk<mailto:rburnett at richieburnett.co.uk>> wrote:
There are good and bad SMPSUs.  I've been responsible for EMC compliance
of products at several places I've worked over the years, so have seen
examples of some very good supplies, and also some real shockers.
Sometimes literally! (>.<)

I won't go into the details but certain supplies like flyback (wall-wart
phone chargers) are notoriously noisy but you have to realise that they
are made down to a target price, size and weight.  So they don't waste
any money, space or weight on removing any more conducted and radiated
emissions than they absolutely need to in order to achieve compliance
whilst charging the battery in your cell phone!

One of the last bastions of the analogue linear power supply used to be
in RF communications receivers because the harmonic spectrum of a
high-power switcher used to put all sorts of "birdies" across the
spectrum of a sensitive broadband radio receiver.  But these days even
high-end radio receivers have switched-mode power supplies inside them.
It just means that they are well designed and people have learned how to
manage things like common-mode noise and stop it getting into the RF
front-end or the audio output.

-Richie,


On 2022-08-02 17:50, Mattias Rickardsson wrote:
> 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!
>>
>> _______________________________________________
>> 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
>> 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
>> 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
> 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
> 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
> 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
> 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
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
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
Selling or trading? Use marketplace at synth-diy.org<mailto:marketplace at synth-diy.org>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://synth-diy.org/pipermail/synth-diy/attachments/20220803/6974eff6/attachment.htm>