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Old 24th January 2009, 05:03 AM   #1
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Default HIRAGA higher power

Hi,
The ‘hiraga classe A’ amps are relatively low power
There is some one that increased the power higher then ‘ le monstre’ 30 watts?
I was thinking of increasing the VCC to +/-50v and the voltage gain, keep the current bias around 1.5 amps getting 100 watts; the big question if it works properly.
I ran some simulations but I am not pleased with the results.
If some one can help and advise I will be grateful.
Best regards
Williams
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Old 24th January 2009, 09:05 AM   #2
lineup is offline lineup  Sweden
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You can search forum for Monstre
I do not remember if we discussed higher power here:
Hiraga "le monstre"
Hiraga "le monstre"

But sure it could be possible.
On the other hand, is often said that
One 10 Watt Class A .... can match 50-100 class ab amplifiers ... in sound quality

10 Watts RMS means +10 dB
If your speakers are SPL 90 dB/1 Watt, you will get like 100 dB level
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Old 24th January 2009, 09:10 AM   #3
lineup is offline lineup  Sweden
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You have hiraga alternative amplifier with 20 Watt:
Hiraga 20W Class A
Hiraga 20W class A

Daniel has made some great, great amplifier there.
See his latest images and posts.
For example here is one picture of his work:
http://www.diyaudio.com/forums/attac...amp=1231062965

Regards
Lineup
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Old 27th January 2009, 09:05 PM   #4
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Hi Lineup,

Thanks for the nice comments i am flattered!!!

that version i made of the 20W class A amp recently measured well.

I have actually written a little article on it for another site when it is finished i will post it it has pictures and measurements and the exact cricuit etc etc...

any how the amp ended up making about 56W rms,

if you used a larger output stage for example sanken 230 or 250W devices - (but still a single pair) and a couple of resistor/transistor changes you could get more power, however the heat would be quite difficult to get rid of !!!!


-Dan
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Old 30th January 2009, 10:15 AM   #5
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Hi daniel,
You built nice things. I built the Douglas Self class A amp and increased the vcc supply so, could get ~45w @ 8 ohms, but I want to build a simplier pwr amp in class A.
My spk are Acoustat 2+1 so I need some thing around 100w.
From my sim, Hiraga amp, when is switching to class AB from class A in order to deliver a higher output power is very distorted and needs to be bias at very high current in order to keep it clean, so I am wondering if can increase the output power of Hiraga amp with out distortions or degrade performance!
How did you rise up the output power?
best regards
Williams
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Old 30th January 2009, 09:04 PM   #6
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Hello Williams,

I increased the rail voltage and also the bias, you need to change a few parts also to do this,

but i think it is worth the effort

-Dan
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Old 31st January 2009, 08:08 AM   #7
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Hi Daniel,
looks that can be done, can you mail some more details on the
schematics and final power
best regards,
Williams
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Old 31st January 2009, 09:16 AM   #8
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Hi Williams.

attached is the orignal
Attached Images
File Type: jpg hiraga schematic.jpg (46.0 KB, 312 views)
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Old 31st January 2009, 09:18 AM   #9
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here is the version i am using at the moment
Attached Images
File Type: jpg hiraga schematic my version.jpg (42.5 KB, 322 views)
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Old 31st January 2009, 09:52 AM   #10
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Hi Daniel,
thanks alot i am testing the new scematics, next week i am starting the project. very nice you answered that fast.
have a nice weekend,
best regards,
Williams
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