[sdiy] Help with Jupiter 8 clone
Mike Bryant
mbryant at futurehorizons.com
Wed Aug 3 17:52:11 CEST 2022
A bit more complicated than that. One Meanwell will pass conducted emissions but put two or three of them in the same box and I bet you can guarantee the resultant thing will fail. Filtering will clean it off the L and N, but the E lead will need attention to stop so much getting on it in the first place.
-----Original Message-----
From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of Roman Sowa
Sent: 03 August 2022 11:10
To: mark verbos; synth-diy at synth-diy.org
Subject: Re: [sdiy] Help with Jupiter 8 clone
$6000 for a couple of MeanWells and Aliexpress meters in rack enclosure?
Time to start mixing console PSU business!
Roman
W dniu 2022-08-03 o 11:11, mark verbos via Synth-diy pisze:
> Here we go again. I have a Huge mixing board in my studio, a
> Soundcraft Vienna 40 channels. It was a touring FOH board in the 90s
> that cost 10s of thousands and I bought it for €800 a couple of years
> ago. It has 2 massive power supplies. One is a CPS 550, a 2 rack space
> unit that puts out a pair of +/-17v rails. The other is CPS 750, a 4
> rack space monstrosity that puts out -17, +17, -7.5, +7.5, +48, +24,
> +24. Together they weigh like 50kg. The rails are something huge like 5A or more each.
> If I switch them on at the same time the breaker in the room blows. I
> could cook eggs on top of them. Naturally, I looked into the idea of
> replacing them with something modern and down the rabbit hole I went.
> There is a whole scene for guys with SSL, Neve, etc. replacing the
> power supplies (which if you have never seen them are 20 rack spaces
> 50cm deep or something) with hip, small, efficient, expensive supplies
> like this https://www.atomicinstrument.com/
> <https://www.atomicinstrument.com/>
> The website from Atomic Instruments is filled with celebrity engineer
> testimonials about how much better the SSL sounds now because of this
> great supply and how finally the owners can turn off their boards at
> night, saving untold fortunes in electricity. What’s missing from the
> discussion is the fact that these are obviously switching supplies. Do
> you think that if the snake oil salesmen would mention this that the
> noisefloor would suddenly get higher and the bass would suffer?
>
> Incidentally, I couldn’t get anyone to supply me a simple replacement
> for my supplies and still live in fear f turning them on. I guess I
> could build something from SMPS units, but I don’t know much about it.
> Maybe the only thing separating the Atomic supplies form the off the
> shelf units is the connector and the LED displays on the front. Do you
> think the display is reading the voltage at the board or in the rack?
> ;)
>
>
> Mark
>
>
>
>
>
>
>
>> On Aug 2, 2022, at 5:56 PM, Mike Bryant <mbryant at futurehorizons.com
>> <mailto:mbryant at futurehorizons.com>> wrote:
>>
>> I’ve been using SMPS in pro-audio equipment we design since the
>> 1970s, as have most of the other top audio designers I know. Some
>> took until the late 90s to come round but from then on everybody who
>> mattered accepted SMPS were better.
>>
>> High frequency current spikes indicate a badly designed SMPS, nothing
>> more. A good one using multi-phase zero-crossing switching will show
>> none of that.
>>
>> Have a look inside every pro-audio product nowadays and you’ll find a
>> SMPS. And to be sold they have to pass mains radiated tests so there
>> is very little mains-side noise. Indeed it is linear supplies which
>> often used to fail those tests as they distorted the mains signal
>> more due to core hysteresis.
>>
>> So I will submit that you have a somewhat jaundiced view.
>>
>> *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 16:47
>> *To:* synth-diy at synth-diy.org <mailto:synth-diy at synth-diy.org>
>> *Subject:* Re: [sdiy] Help with Jupiter 8 clone
>>
>> 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-be
>> ing-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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