Hiraga "le monstre" - Page 85

permaneder · 17th April 2012, 09:45 PM

Quote:

Originally Posted by ChicagoJTW

If the bias is too low, increase the values of both (!) trim pots to the same value and vice versa whether it's too high.

If your transistors aren't perfectly matched, though, having matched bias resistors on each side won't balance. I try to match Iq rather than R.

No. It is better to balance the output offset by the 100R trim pot.

I wrote that it is preferable to match them close. But it will work sturdy, even if you don't. I don't talk about a heavy mismatch.

HVfanatic · 25th April 2012, 02:57 PM

Sorry for spamming the thread: Can someone send me the link to a pcb most people are using here??? Want to etch my own PCBs...

Thanks, Dirk

jeepy · 25th April 2012, 03:56 PM

Hello All,
Any chance to buy authentic parts somewhere? Thanks a lot.

Rixsta · 23rd September 2012, 10:01 PM

Hey, i just bought a "le monstre" 12v version, does anyone have any opinions of this ? when i get it ill share more close up pics. and also can anyone recommend the right kind of 12v battery that's not too big (like car batterys are). ill be using this in a car in future but for now want to power it at home so just need a PSU or battery or both so it can be charged. I don't realy have an idea!

Car Amplifier Class A, 2x20W (J .Hiraga schematic) no audison, brax, dls | eBay

Thanks

neazoi · 24th September 2012, 06:12 AM

Quote:

Originally Posted by Rixsta

Hey, i just bought a "le monstre" 12v version, does anyone have any opinions of this ? when i get it ill share more close up pics. and also can anyone recommend the right kind of 12v battery that's not too big (like car batterys are). ill be using this in a car in future but for now want to power it at home so just need a PSU or battery or both so it can be charged. I don't realy have an idea!

Car Amplifier Class A, 2x20W (J .Hiraga schematic) no audison, brax, dls | eBay

Thanks

I am powering my le monstre only from batteries. See here Le monstre
Oh and something else, the "le monstre" is 8W, not 20W.

Rixsta · 24th September 2012, 11:55 PM

Quote:

Originally Posted by neazoi

I am powering my le monstre only from batteries. See here Le monstre
Oh and something else, the "le monstre" is 8W, not 20W.

Your site is brilliant! i found it the other day too thankyou, very helpfull!
i thought that there are some variations of the "le monstre" on the internet.

Rixsta · 25th September 2012, 12:06 AM

If you see the pictures on the ebay link i posted you'll see the terminals of this amplifier say

GND
REM
+12v

So i presume that is not "dual rail" and this amp must be based on the
"le monstre" but not the same as the original.

Rixsta · 12:59 AM

Could someone please identify which version of the amp i have ? and any details about it, upgrade ideas ....

thankyou

permaneder · 25th September 2012, 04:45 AM

It is the 20W version of Jean Hiraga's class A amp.

permaneder · 25th September 2012, 05:22 AM

I'm in doubt that your amp really runs class A up to 20W.

At an idle current of 1A and +- 21V supply rails the amp would draw more than 40W per channel (= total 84W). That would be too much power dissipation for the unsufficiant heat sinking capabilities of your amp's casing (I can't see any fans in your pictures).

So I believe it has a class AB setting to lower the power dissipation of the output transistors of the amp and the pulsed supply.

25th April 2012, 03:56 PM	#843
jeepy diyAudio Member Join Date: Feb 2010	Help - 2sa872AE wanted! Hello All, Any chance to buy authentic parts somewhere? Thanks a lot.

25th September 2012, 12:37 AM	#848
Rixsta diyAudio Member Join Date: Feb 2004 Location: Barrow-In-Furness, Cumbria	Could someone please identify which version of the amp i have ? and any details about it, upgrade ideas .... thankyou Last edited by Rixsta; 25th September 2012 at 12:59 AM.

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25th April 2012, 02:57 PM	#842
HVfanatic diyAudio Member Join Date: Feb 2008	Sorry for spamming the thread: Can someone send me the link to a pcb most people are using here??? Want to etch my own PCBs... Thanks, Dirk

23rd September 2012, 10:01 PM	#844
Rixsta diyAudio Member Join Date: Feb 2004 Location: Barrow-In-Furness, Cumbria	Hey, i just bought a "le monstre" 12v version, does anyone have any opinions of this ? when i get it ill share more close up pics. and also can anyone recommend the right kind of 12v battery that's not too big (like car batterys are). ill be using this in a car in future but for now want to power it at home so just need a PSU or battery or both so it can be charged. I don't realy have an idea! Car Amplifier Class A, 2x20W (J .Hiraga schematic) no audison, brax, dls \| eBay Thanks

25th September 2012, 12:06 AM	#847
Rixsta diyAudio Member Join Date: Feb 2004 Location: Barrow-In-Furness, Cumbria	If you see the pictures on the ebay link i posted you'll see the terminals of this amplifier say GND REM +12v So i presume that is not "dual rail" and this amp must be based on the "le monstre" but not the same as the original.

25th September 2012, 04:45 AM	#849
permaneder diyAudio Member Join Date: May 2009 Location: Somewhere in the south	It is the 20W version of Jean Hiraga's class A amp.

25th September 2012, 05:22 AM	#850
permaneder diyAudio Member Join Date: May 2009 Location: Somewhere in the south	I'm in doubt that your amp really runs class A up to 20W. At an idle current of 1A and +- 21V supply rails the amp would draw more than 40W per channel (= total 84W). That would be too much power dissipation for the unsufficiant heat sinking capabilities of your amp's casing (I can't see any fans in your pictures). So I believe it has a class AB setting to lower the power dissipation of the output transistors of the amp and the pulsed supply.