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Old 27th March 2011, 07:11 AM   #1
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Default Very Simple 200W 4R amp

I found this on the net, very simple but not really sure of its performance.
Opinions will highly be appreciated

Supply is split 50VDC
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Old 27th March 2011, 09:31 AM   #2
lineup is offline lineup  Sweden
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Lower part shoulld read TIP41-TIP42.

It looks good.
Maybe you should consider better audio output transistors.
Why not TIP35, TIP36
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Old 27th March 2011, 10:15 AM   #3
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@lineup, thanks for the correction, i really didnt noticed it hehehe
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Old 27th March 2011, 10:44 AM   #4
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Default Corrected Shematics

posted the wrong schematics (thanks lineup) here's the the correct one. If you look @ the component placement, the output trannies are 2SC5200 and 2SA1943
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Old 27th March 2011, 11:41 AM   #5
lineup is offline lineup  Sweden
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"trannies are 2SC5200 and 2SA1943"
They are great.
In the PCB tells correct.

What can be an issue is the bias by 1N4004 diodes.
Maybe 10 mA will not give wanted bias.
Diodes can not easily be put on heatsink. Only close to.

I suggest a transistor for setting bias. A vbe multiplier.
Such transistor that can be mounted on heatsink to sense heat.
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Old 27th March 2011, 05:28 PM   #6
jaycee is offline jaycee  United Kingdom
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It's rubbish. Those biasing diodes are not on the heatsink so it wont be thermally stable. Also, driving 2SA1943/2SC5200 with TIP41C/TIP42C ? Why ?
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Old 27th March 2011, 06:05 PM   #7
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Quote:
Originally Posted by jalou1995 View Post
posted the wrong schematics (thanks lineup) here's the the correct one. If you look @ the component placement, the output trannies are 2SC5200 and 2SA1943
Just a couple more parts and you can have a "real amp" (below) , use mje340/350 for Q 10/11/12 and any Toshiba clone for output (4302/4281 or 1943/5200). These internet amps are pathetic ... Amp below has been thoroughly "abused".

OS
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Old 28th March 2011, 08:58 AM   #8
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Quote:
Originally Posted by jaycee View Post
It's rubbish. Those biasing diodes are not on the heatsink so it wont be thermally stable. Also, driving 2SA1943/2SC5200 with TIP41C/TIP42C ? Why ?
"Rubbish" most of the circuits on the net are
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