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-   -   Very Simple 200W 4R amp (http://www.diyaudio.com/forums/solid-state/185878-very-simple-200w-4r-amp.html)

jalou1995 27th March 2011 07:11 AM

Very Simple 200W 4R amp
 
2 Attachment(s)
I found this on the net, very simple but not really sure of its performance.
Opinions will highly be appreciated

Supply is split 50VDC

lineup 27th March 2011 09:31 AM

Lower part shoulld read TIP41-TIP42.

It looks good.
Maybe you should consider better audio output transistors.
Why not TIP35, TIP36

jalou1995 27th March 2011 10:15 AM

@lineup, thanks for the correction, i really didnt noticed it :headbash: hehehe

jalou1995 27th March 2011 10:44 AM

Corrected Shematics
 
1 Attachment(s)
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

lineup 27th March 2011 11:41 AM

"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.

jaycee 27th March 2011 05:28 PM

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 ?

ostripper 27th March 2011 06:05 PM

1 Attachment(s)
Quote:

Originally Posted by jalou1995 (Post 2518019)
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

jalou1995 28th March 2011 08:58 AM

Quote:

Originally Posted by jaycee (Post 2518325)
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 :D


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