Joyo PowerSupply 2 schematic  [schematic]

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Joyo PowerSupply 2 schematic  [schematic]

Postby apollomusicservice » 09 Nov 2017, 19:55

From the Joyo's review it's isolated.
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Re: Joyo PowerSupply 2 schematic

Postby plush » 09 Nov 2017, 20:01

apollomusicservice wrote:From the Joyo's review it's isolated.


Turns out it is not.
Nothing surprising.
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Re: Joyo PowerSupply 2 schematic

Postby Ice-9 » 10 Nov 2017, 02:53

plush wrote:
apollomusicservice wrote:From the Joyo's review it's isolated.


Turns out it is not.
Nothing surprising.


well that's no surprise is it. they use the wording 'isolated outputs' to mean separate output connectors and not actual isolated outputs. It is a bad play on wording.
It's fairly straight forward, if you want to start it , press start. You can work out the rest of the controls for yourself !

No silicon heaven ? preposterous ! Where would all the calculators go ?

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Re: Joyo PowerSupply 2 schematic

Postby Ice-9 » 10 Nov 2017, 03:03

to be fair only sellers describe it as isolated outputs and the joyo website describe it as short circuit isolated on individual outputs. two complete different meanings
It's fairly straight forward, if you want to start it , press start. You can work out the rest of the controls for yourself !

No silicon heaven ? preposterous ! Where would all the calculators go ?

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Re: Joyo PowerSupply 2 schematic

Postby apollomusicservice » 10 Nov 2017, 07:40

Ice-9 wrote:to be fair only sellers describe it as isolated outputs and the joyo website describe it as short circuit isolated on individual outputs. two complete different meanings

On the Joyo's original box the first sentence is: Ten isolated output.
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Re: Joyo PowerSupply 2 schematic

Postby Ice-9 » 11 Nov 2017, 20:51

apollomusicservice wrote:
Ice-9 wrote:to be fair only sellers describe it as isolated outputs and the joyo website describe it as short circuit isolated on individual outputs. two complete different meanings

On the Joyo's original box the first sentence is: Ten isolated output.


so even joyo describe it differently on the box and in other blurb. Does anyone fancy a forum project with real isolated outputs ? I might do one if anyone is interested.
It's fairly straight forward, if you want to start it , press start. You can work out the rest of the controls for yourself !

No silicon heaven ? preposterous ! Where would all the calculators go ?

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Re: Joyo PowerSupply 2 schematic

Postby 287m » 11 Nov 2017, 21:27

Yes, please.
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Re: Joyo PowerSupply 2 schematic

Postby krome_magnon » 11 Nov 2017, 23:20

Ice-9 wrote:Does anyone fancy a forum project with real isolated outputs ? I might do one if anyone is interested.


Oh yes!

I can't imagine how it's done without individual taps off a transformer into normal linear regulator ICs. Would love to know how to do it.
The noise from the tape deck was only drowned out by the buzz from the wine.
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Re: Joyo PowerSupply 2 schematic

Postby Frabbio » 12 Nov 2017, 15:12

Is it possible to have several isolated outputs starting from a single power supply using PWM ICs like the SG3525, give a look here.
http://www.aresaudio.com/stomps-power-supply.html
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Re: Joyo PowerSupply 2 schematic

Postby apollomusicservice » 12 Nov 2017, 16:30

Frabbio wrote:Is it possible to have several isolated outputs starting from a single power supply using PWM ICs like the SG3525, give a look here.
http://www.aresaudio.com/stomps-power-supply.html

Supply with switching technology and half-wave rectification, I don't think that it's good solution for audio equipment.
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Re: Joyo PowerSupply 2 schematic

Postby Frabbio » 12 Nov 2017, 16:51

It should work around 30khz switching frequency , bu eventually one can modify it to run on higher frequencies, i don't think it will cause any audio interferences.
Of course a classic linear power supply is better for audio, but it will need a secondary for each output.
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Re: Joyo PowerSupply 2 schematic

Postby howmuch » 13 Nov 2017, 15:09

FYI
A very good value-for-money isolated power supply is the Harley Benton PowerPlant Junior (not the bigger one).
Outwardly, it looks similar to the T-Rex Fuel Tank Junior.
The gutshots here show that it has 5 secondary transformer taps, each with their own bridge rectifier and regulator.

It's odd that while most Harley Benton pedals are rebadged Joyos, Joyo don't make this power supply.

Now back to the DIY talk...
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Re: Joyo PowerSupply 2 schematic

Postby Ice-9 » 13 Nov 2017, 18:45

I have had a quick look at what I think would be the most cost effective way to design an isolated PSU, it is using the small 'Block' transformers that have 2 completely separate secondaries per transformer which will allow for 2 outputs per Tx. I haven't bought any transformers yet to try out and the ones shown in the 3d render are just examples. I will need to select suitable TX's and then look at the correct dimensions for the PCB.

The PCB I have layed out as an example has 4 isolated 9v DC outputs with 100mA regulators and 2 9v DC outputs using TO220 1amp regulators . The PCB so far can be expanded easily just buy duplicating each section of two outputs.

As I say though, so far this is just an example of type and layout.

Image
It's fairly straight forward, if you want to start it , press start. You can work out the rest of the controls for yourself !

No silicon heaven ? preposterous ! Where would all the calculators go ?

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Re: Joyo PowerSupply 2 schematic

Postby Ice-9 » 13 Nov 2017, 18:59

sorry picture did not post correctly above, so I will try again.

Image
It's fairly straight forward, if you want to start it , press start. You can work out the rest of the controls for yourself !

No silicon heaven ? preposterous ! Where would all the calculators go ?

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287m (13 Nov 2017, 22:56)
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Re: Joyo PowerSupply 2 schematic

Postby camljenkins94 » 14 Nov 2017, 05:31

Oh, it is isolated, let me show you! *proceeds to blow all of the fuses in it* See, every output is now completely isolated!
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