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Old 17th April 2012, 09:45 PM   #841
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Quote:
Originally Posted by ChicagoJTW View Post
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.
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Old 25th April 2012, 02:57 PM   #842
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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
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Old 25th April 2012, 03:56 PM   #843
jeepy is offline jeepy  Switzerland
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Default Help - 2sa872AE wanted!

Hello All,
Any chance to buy authentic parts somewhere? Thanks a lot.
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Old 23rd September 2012, 10:01 PM   #844
Rixsta is offline Rixsta  United Kingdom
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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
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Old 24th September 2012, 06:12 AM   #845
neazoi is offline neazoi  Greece
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Quote:
Originally Posted by Rixsta View Post
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.
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Old 24th September 2012, 11:55 PM   #846
Rixsta is offline Rixsta  United Kingdom
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Quote:
Originally Posted by neazoi View Post
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.
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Old 25th September 2012, 12:06 AM   #847
Rixsta is offline Rixsta  United Kingdom
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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.
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Old 25th September 2012, 12:37 AM   #848
Rixsta is offline Rixsta  United Kingdom
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Could someone please identify which version of the amp i have ? and any details about it, upgrade ideas ....

Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.

thankyou

Last edited by Rixsta; 25th September 2012 at 12:59 AM.
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Old 25th September 2012, 04:45 AM   #849
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It is the 20W version of Jean Hiraga's class A amp.
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Old 25th September 2012, 05:22 AM   #850
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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.
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