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Old 21st November 2011, 09:00 PM   #11
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I will say they use the same design just more output transistors on the higher power 803 version (4 pairs/ch.).
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Old 21st November 2011, 09:04 PM   #12
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Old 22nd November 2011, 08:32 PM   #13
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no sliding bias in the 25/25...
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Old 22nd November 2011, 08:42 PM   #14
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the above circuit is a basic amp using the same o/p devices there's better devices such as mj15024's also looking at this circuit it appears there is a fuse on the o/p plus no s/c protection that will steal the drive if there's a short on the o/p...
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Old 23rd November 2011, 02:08 PM   #15
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no sliding bias in the 25/25...
I think that in order to have sliding bias there must be two additional small signal transistors used for sensing? I can't see them in the photo of the PCB.
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Old 25th November 2011, 12:25 AM   #16
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...oops, wait a sec, that vbe multiplier is connected to one of the emitter resistors...

the other end...

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