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Question of the amplifier circuit Jean Hiraga's Class-A
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Author:  Soundbrigade [ 22 Apr 2013, 12:01 ]
Post subject:  Re: Question of the amplifier circuit Jean Hiraga's Class-A

I can scan and send you an article in Swedish about the project (the original classA 8W), else you can dive out and hope the parachute will work ... :eek:

I build the original Eightwatter on small experimentboards and when wnting to make things work, I forst bought real PCBs and of course changed my mind and bought the KIT. However the newer Monster is rated 15W requiring heavier transformer and PSU than the original so I am, as we Swedes say, "stuck with my beard in the mailbox".

I can point you in the direction I went:
The Hiraga 15W Monster
The Hiraga Super 30W

I still have to find out if I can run the amp on my 2x12W tranny, or if I have to buy a bigger 'un. And I guess I have to add a huge amount of Farads and all rated at at least 35V. :2c:

Author:  earwaxxed [ 30 May 2013, 21:29 ]
Post subject:  Re: Question of the amplifier circuit Jean Hiraga's Class-A

Quick question on power supply - I have a couple of SMPS's wondering if they would work. What voltage range would the Super Class A amp tolerate ex. 35VDC +/- 5V? How many amps as well. Thanks much!

Author:  earwaxxed [ 31 May 2013, 15:37 ]
Post subject:  Re: Question of the amplifier circuit Jean Hiraga's Class-A

Another quick question - any ideas on how this amp compares with the NELSON pass DIY class a project?

Author:  Gio [ 04 Jun 2013, 23:22 ]
Post subject:  Re: Question of the amplifier circuit Jean Hiraga's Class-A

Hi earwaxed - SMPS are not be suitable for use with this class-A amp design.

Cheers

Author:  Mhavskie [ 27 Sep 2013, 11:16 ]
Post subject:  Re: Question of the amplifier circuit Jean Hiraga's Class-A

this is my pcb design :)

Image

Author:  mwhouston [ 01 Oct 2013, 07:54 ]
Post subject:  Re: Question of the amplifier circuit Jean Hiraga's Class-A

I assume for the La Monster 6W?

Author:  Soundbrigade [ 01 Oct 2013, 09:32 ]
Post subject:  Re: Question of the amplifier circuit Jean Hiraga's Class-A

Eight Watt. Or is there a 6W version?

Author:  Ben Lamb [ 27 Dec 2013, 06:37 ]
Post subject:  Re: Question of the amplifier circuit Jean Hiraga's Class-A

Hi everyone -

Just finished building one of these - here it is -



Seems to work well - what do you guys think of it ?

Author:  mwhouston [ 27 Dec 2013, 13:52 ]
Post subject:  Re: Question of the amplifier circuit Jean Hiraga's Class-A

Ben Lamb wrote:
Hi everyone -

Just finished building one of these - here it is -



Seems to work well - what do you guys think of it ?

No image

Author:  suztek [ 04 Feb 2014, 08:32 ]
Post subject:  Re: Question of the amplifier circuit Jean Hiraga's Class-A

Hi, i am busy building the Hiraga 30 watts version and found the i cannot get thr 2 sa 872 and 2sc 1775 transistors,can anyone confirm that i can use equivalents like the BC639 and BC640 whose characteristics i found very close to the original specified transistors.

UPDATE - Hiraga 30W Transistor Equivalents

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