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30w Jean Hiraga Power Supply Design, one large capacitor or several?
30w Jean Hiraga Power Supply Design, one large capacitor or several?
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Old 11th July 2018, 11:00 AM   #21
jazz is offline jazz  Netherlands
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Hi,

been thinkin a bit more about this. Seems like this is your first diy class a power amp build?

If so please take a step back. Get a 300VA 2X18 secondary toroid, the psu pcb from diyaudio and some 22.000uF/35V caps (something like nichicon lgu). This would probably cost somewhere between 100 - 150 Euro's total. ohw and buy some cheap 25A brdige rectifier blocks.

Such a setup will do nicely getting everything running and sounding quite good (no not as good as with separatie supplies and such). This way you don't risk the nice parts you have bought. ie the trannies, chokes and rectifiers. I have build this amp that way and it sounds good. Learn and after that see how you can use the parts already bought. Plus you can use this psu afterwards to experiment with all those nice Pass designs like the aleph-j and such.

grtz

Joris
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Old 11th July 2018, 11:43 AM   #22
vishalk is offline vishalk  United Kingdom
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Quote:
Originally Posted by jazz View Post
Hi,

been thinkin a bit more about this. Seems like this is your first diy class a power amp build?

If so please take a step back. Get a 300VA 2X18 secondary toroid, the psu pcb from diyaudio and some 22.000uF/35V caps (something like nichicon lgu). This would probably cost somewhere between 100 - 150 Euro's total. ohw and buy some cheap 25A brdige rectifier blocks.

Such a setup will do nicely getting everything running and sounding quite good (no not as good as with separatie supplies and such). This way you don't risk the nice parts you have bought. ie the trannies, chokes and rectifiers. I have build this amp that way and it sounds good. Learn and after that see how you can use the parts already bought. Plus you can use this psu afterwards to experiment with all those nice Pass designs like the aleph-j and such.

grtz

Joris

That would be sensible Joris, I built a Jean Hiraga Le Monstre in a kit form both the power supply and amplifier boards.



Yes this is my first major project and I want to see it through till the end,

Considering I have most of the parts I just want to build it, otherwise it will never get done.
I'm almost done just the bloody PSU design.
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Old 11th July 2018, 12:02 PM   #23
jazz is offline jazz  Netherlands
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Hi,

Glad you tell about the monstre. What voltage are the psu rails? you could use this psu for initial testing with the le classe. Disconnect the monstre amp pcbs and attach the le classe pcbs. saves money and gives you the chance to listen to the le classe asap.


grtz
Joris
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Old 11th July 2018, 01:20 PM   #24
vishalk is offline vishalk  United Kingdom
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Quote:
Originally Posted by jazz View Post
Hi,

Glad you tell about the monstre. What voltage are the psu rails? you could use this psu for initial testing with the le classe. Disconnect the monstre amp pcbs and attach the le classe pcbs. saves money and gives you the chance to listen to the le classe asap.


grtz
Joris

Not an option unfortunately as it's being used, gave it as a present to a family member! I really have to just build the PSU with what I have!
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Old 11th July 2018, 02:27 PM   #25
jazz is offline jazz  Netherlands
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Hi,

Ok, nice gift. Based on this, primary instincht says to go with the lcrc option suggested by Pieter. The other option is attached. As good a compromise I can come up with given te components at hand.


Still have some reservations in both cases. Those chokes are going to be hot!!! a lot of heat to dissipate inside the chassis. This will have an influence on behaviour and longevity of other components. The caps will suffer most to temperature.


Still would like someone to chime in on the effect of using the Lundahs in common mode choke.


Have a look at the difference in drawing the ground/0V lines in the psu. Think of those as signal wires. Again not certain about the influence of common mode choke here. Anyway, connect all ground points at the end of the psu.


grtz

Joris
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Old 11th July 2018, 03:15 PM   #26
vishalk is offline vishalk  United Kingdom
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Quote:
Originally Posted by jazz View Post
Hi,

Ok, nice gift. Based on this, primary instincht says to go with the lcrc option suggested by Pieter. The other option is attached. As good a compromise I can come up with given te components at hand.


Still have some reservations in both cases. Those chokes are going to be hot!!! a lot of heat to dissipate inside the chassis. This will have an influence on behaviour and longevity of other components. The caps will suffer most to temperature.


Still would like someone to chime in on the effect of using the Lundahs in common mode choke.


Have a look at the difference in drawing the ground/0V lines in the psu. Think of those as signal wires. Again not certain about the influence of common mode choke here. Anyway, connect all ground points at the end of the psu.


grtz

Joris

looks good Joris, although i was hoping to use one choke per power supply? With your design i would need a total of 4 chokes i only have two!

And i want to use minimum 0.6F of capacitance per channel. Tall order i know, but i'm sure it must be possible.

Anyone else out there in diyaudio land got ideas?
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Old 11th July 2018, 03:34 PM   #27
pieter t is offline pieter t  Netherlands
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You can do with one choke per power supply in common mode connection, see Lundahl datasheet:
http://www.lundahl.se/wp-content/upl...heets/2733.pdf
All the needed info is there.
@ Joris: these chokes will not get so hot with some 1,5 A; they will dissipate some 5 watt.

Last edited by pieter t; 11th July 2018 at 03:39 PM.
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Old 11th July 2018, 04:39 PM   #28
jazz is offline jazz  Netherlands
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Hi,

@Pieter: ok thanks, could you verify the chokes working as intended in the previously attached schematic?
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Old 11th July 2018, 06:07 PM   #29
vishalk is offline vishalk  United Kingdom
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Default choke in common mode.

Ok thats great but how does one do that? Can it also handle that? I thought putting the choke coils in parallel allows it to handle more amps? But clearly if i can just wire it up in common mode setup it would be much easier.

Still need help in designing the PSU for a mono setup using one coil per channel with around 0.6F - 0.8F.

Tried using PSU designer, but too many variables and not getting what i need from it, need to really spend time on it.
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Old 11th July 2018, 07:30 PM   #30
vishalk is offline vishalk  United Kingdom
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Click the image to open in full size.

This is similar to what i need to do right? Just replace one of the chokes with a resistor instead? Surely thats fine? If i need to buy more chokes could i use this?


High Grade 10mH 5A chassis mount smoothing choke

High Grade 10mH 5A chassis mount smoothing choke with M6 laminations Passlabs | eBay

although far cheaper to just buy a resistor and make it a LCRC
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