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Old 20th May 2006, 09:46 AM   #1
masag is offline masag  Germany
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Default Hiraga MC + Pass PSU

Dear Sirs,

I've found these schematic in the forum, and want to start with it.

Does anybody can give me some information?

I want to substitude the MAT's with matched 2SA1316 and 2SC3329

the jfets are matched 2SK170's.

What do you think about?

For the PSU I want to use the Pearl-PSU, but I would need help to calculate it down to 12 V. Maybe I can get some advice from this great forum?

Thank you

Sam
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Old 20th May 2006, 09:51 AM   #2
masag is offline masag  Germany
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Default Pearl_PSU

Here the Pearl PSU
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Old 21st May 2006, 04:54 AM   #3
hacknet is offline hacknet  Singapore
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imo, if you want to build a nice fancy power supply, you should try the jung regs. apparently they sound really good on noise sensitive equipment like phono amps.
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Old 21st May 2006, 06:01 AM   #4
masag is offline masag  Germany
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Default Super regulators

Thank you,

but I believe that a simple circuit needs a simple psu.

Nobody here that can help me calculating the pearl psu down to 12V?

Sam
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Old 21st May 2006, 06:04 AM   #5
hacknet is offline hacknet  Singapore
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you have to change the voltage divider ratios R10 and R11 with reference to the zener D1.
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Old 21st May 2006, 06:23 AM   #6
masag is offline masag  Germany
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Can you give me a formula how the the the voltage devider should be calculated?

Thanks
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Old 21st May 2006, 10:37 AM   #7
forr is offline forr  France
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MASAG
The design you show is not due to Jean Hiraga but to Serge Rabeyrolles. The starting idea was the so called Hiraga's circuit which was a simple common base circuit biased like a current mirror. Here it is. The Rabyerolles's circuit has some negative feedback which makes it having a little more input impedance than the Hiraga's.
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Old 21st May 2006, 11:08 AM   #8
masag is offline masag  Germany
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Forr,
thank you for taking a look at my thread.

Now I found the original print at Bonavoltas. You are right Forr!

Did you ever listened to Serge Rabeyrolles version of the prepre?

Yesterday I finished my TD160 an plugged it to my Rotel 970 Phono-preamp (my only non-modified part in my audio chain, sound not really good)), and made immediately the decission to start up a new project.

A friend of mine has built a wonderful Hiraga Pre-Pre battery powered, but why not start a new project?

Thanks

Sam
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Old 26th April 2008, 10:16 AM   #9
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Right at the moment, I'm experimenting with a version of the circuit of the first posting. Im using 2sk389 for the current sources and THAT-corporation 340er transistor die for the current mirrors. And trying 2sc1775/2sa872, zvn3306/zvp3306 and 2sk982/2sj148 as the bipolar driven folded cascodes, all with decent results. Hard to say which sounds really better.

I use a bit different resistor values and no NFB. I'm experimenting with a servo, because the DC wanders a bit, but with no luck so far.

If I cap-couple it, it sounds very nice: both relaxed, serious and very detailed. (with passive riaa and pass/curl/hansen -style open loop second stage).

Rüdiger
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Old 31st May 2008, 03:58 PM   #10
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Default hiraga le pre pre

Hello,

Im interested to know what results have been had with a 12v source from a PSU as
opposed to battery power, has anyone done a comparison?



regards


carl
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