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Cascading diamond buffers - a cheap low THD 10W amp with TIP41C
Cascading diamond buffers - a cheap low THD 10W amp with TIP41C
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Old Yesterday, 11:07 PM   #201
suzyj is online now suzyj  Australia
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Many output sections are doable, at least in simulation. The attached screen grab shows 16. 10KHz THD driving 10V peak into 4 ohms is 2ppm with +/-18V supply.

This is approx worst case for dissipation. I measure ~500mW per transistor pushing the 10V peak sine wave into 4 ohms, so no heatsinking required.

It keeps going - 14V peak into 4 ohms is ~2.5ppm at 10K. That's 25W, no heatsink

I had to increase some of the compensation caps a tad to keep it stable, due to the added capacitance of all those output stages.

A quick back of the envelope calculation shows the cost of each output stage to be $2.35, so this sixteen stage mess will come in at $37 for all the output stage bits. Everything else will cost say $8, so cost isn't high.

Real estate wise, on my current prototype each output block is 1.3" x 0.38", so 0.5 inches square. so sixteen would be 8 square inches, or (say) 2.6" x 3".

Oh, the eagle eyed will note I configured this one as an inverting amp. Non inverting performance is identical. Can't think why you'd ever want an inverting power amp though.

I wonder if the BD179/180 is really the best transistor for non heatsink use though? BD139/140 might perform a little better. Will have to keep playing.
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