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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 1st August 2018, 01:07 PM   #201
jazz is offline jazz  Netherlands
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Good suggestion. Using the test setup he could compare both psu layout's
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Old 1st August 2018, 04:24 PM   #202
vishalk is online now vishalk  United Kingdom
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My plan is to compare, test and try PSU layouts. As i said i am still waiting on parts to arrive. Eduard you can never have to many parts ;o) i'm sure like many you have sourced and bought random parts for projects.

Plus it's a really good thread which in the future will help other builders, time for me is an issue. Work, family commitments means i get 2-4 hours a week to do this which includes reading up on amplifiers, PSU's, research etc

August the 4th on holiday for a few weeks! so will try to get something done this friday.
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Old 1st August 2018, 04:59 PM   #203
eduard is offline eduard  Netherlands
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Hello,
You can connect one transformer with one or two bridge rectifiers. Connect one ll2733 in common mode than a total of two caps and 18 ohm across each cap as a load.
Tell us about the output voltage you are getting and i will post again.
It is not a good thread. All things have been said before here on diy audio. I have friends in Vietnam who use LL2733 for choke input on Nelson Pass power amps.
Bye bye,Ed
P.s in the attachment you can see how i tested a single rail choke input power supply with a big power resistor ( 15 ohm 200 watt) with a big Philips transformer Philips
You will need two of those because there is just one secundairy for each channel. ( in fact two put you need to put them in series to get the right output voltage. It is a nice transformer from decades ago probably made for some medical or other high tech application. There is a static screen and i assure Philips people know how to make good stuff.
I used two big chokes for the input chokes then a cap then the LL2733 in common mode then the last cap.
This is for a class D amp and i got close to 29 volts on the last cap. This amp needs that to have higher output. If not i could have used the LL2733 as input choke and be happy with 24 volts or so.
I used two or 3 A rated diodes but because of choke input they will not blow even with a 15ohm load! See you in september probably!
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Old 1st August 2018, 05:12 PM   #204
vishalk is online now vishalk  United Kingdom
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Things may have been said before, but i have yet to find someone on here who has built a Hiraga with R cores and Chokes for the PSU, all things you suggested many times, difference is i am actually trying to build it!

I value your input Eduard, so just be patient! See you september
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Old 1st August 2018, 05:38 PM   #205
eduard is offline eduard  Netherlands
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haha,
I built a 30 watt Hiraga with CLC power supply in 1985 with the original parts from Paris. A friend of mine i still using the 20 watt Hiraga with CLC power supply for output stage and Guido Tent shunt power supplies for the input stages.
A lot of diy stuff build in France never gets published outside of France. I am sure there are R cores used for Hiraga amps especially because Selectronic sold them before going bankrupt.
The power supply in the photo took me maximum two hours to build. You can see that but it was just build to check the output voltage. You can do the same.
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Old 3rd August 2018, 12:59 PM   #206
vishalk is online now vishalk  United Kingdom
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Default Bus Bars arrive

Copper Bus Bars finally came!

DSC_0596.jpg

But now unfortunately i am being dragged to go on holiday tomorrow, i would rather have peace and finish building this but the wife isn't going let me.

So i will see you all in three weeks with some results! Enjoy the summer holidays guys!
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Old 3rd August 2018, 01:07 PM   #207
eduard is offline eduard  Netherlands
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You didn't need bars to make a test set up.
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Old 23rd August 2018, 08:08 PM   #208
sergiu2009 is offline sergiu2009  Romania
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Hi Vishalk, I was using 1ohm/20w and they where impossible to touch because of the high temp.. Now at 0.22/30w the resistors are barelly warm and the sound is more open and relaxed overall. This is what I discovered at the time I was testing the amp.
Beware of the choke dissipation and resistor dissipation.
I also wanted to make Dan's version of Hiraga at +-35Vcc but he also sugested (after speaking to him) to only increase the bias slightly up to 1.7 amps instead of a very high voltage+bias because his version was HOT.
Subjectivelly going to 1.65A has made some noticeable changes in good to the sound, but when I tried (because my custom trafos are actually 2*25V ac, and I modified them to a lower Vac) +-32Vcc there was only an increase in power, but the same sound as with 1.65A~1.7A at 27~28Vcc as my base version so I sticked to a lower Vcc and higher bias.
Plus that you have to take into consideration the summer's high temps..........
Oh and I forgot to tell that the R cores are actually much much more easy to unwind than toroids, C or double C cores or EI. Look on a tutorial on youtube on how to wind them and then take your lazy bones to work.
But first try the amp at +-35Vcc and then try what I tried earlier and then choose what you like. You have nothing to loose!
Cheers
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Old 23rd August 2018, 09:12 PM   #209
sergiu2009 is offline sergiu2009  Romania
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Oh and I forgot to report back some of my findings from my amp (wich were mentionned here and there, from Hiragas articles and from what others posted on diy audio) for wich I didnt have time to open a thread so that others should try and be happy..
So I'll post them in a order becuase they trully made a difference in my amp:
1. Make the 22v zenners composed of 3 or 4 smaller ones in series (or kubota reg)-- this trully increases the hights noticeably ( ads more microdetails, finess).
2. Bath solder and make as fat as possible the PCB traces from the base of the drivers to the outputs and output -- this makes a really big difference in the bass department (really worthwille).
3. Different psu for the outputs and drivers and a different smaller one for the inputs for EACH CHANNELL--increases channel separation and makes a big 3d imaging and you can really distinguish even better each and every single instrument--higly recommend;
4. Use 3w metal oxide or metal film (or any non inductive) resistors in parallel for the outputs and 2w regular metal film or very low noise resistors for the rest of the amp-- increases clarity and microdetails very much;
5. Proper star ground connections, fat and short cables, and proper overall shielding -- reduces background noises very good and makes a very clear presentation, relaxed sound ;
6. Add more capacitance to the input( instead of 22uF or 47uF I added almost 1500uF+some tantals but addind 2000uF and a 100uf of very good quality will suit just fine)-- this openes the sound and adds bass and microdetails allot..
7. Use bigger trafos than needed with more current (5A or more per channel) -- this not only that makes a rounder bass improves the overall presentation in openess chapter, presence, microdetails..
8. Chose your transistors very wiselly based on what others have tried and listened not necessarily the originall one (buy a couple of drivers and outputs, listen to them and then use what you like most --you will see what I mean.. (tastes are very different).
9. Psu filtering: not smaller than 2*0.1F( big capacitance does matter if you try and compare)..
10. CLC or CRC (I leave this to you) as I didnt try the chocke..
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Old 24th August 2018, 07:20 PM   #210
vishalk is online now vishalk  United Kingdom
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Sergiu this is great information and something i will be trying, i will be building the PSU next week when i return from my holidays, so i will be sure to keep everyone updated
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