modified 11 years ago

Weird amp

00:49:25

A little modification with increased efficiency levels. Even at maximum draw the current  is 1.38A. Take the maximum and you get around 55W spent but the output is 40W. Does that mean over 80% efficiency??

published 11 years ago

rbrtkurtz

11 years ago

Looks to me like the output is 25W. 40W in, 25W out is a little better than 60%.

thebugger

11 years ago

The coil and the cap is what increased the efficiency. Jow did you figure 7W out? Its 25W

hurz

11 years ago

I see 41.6W in and 13W out. Makes 31% efficiency. Next will probably calculate even worse ;-) note: i removed the strange coil+diode+cap power supply combi.

hurz

11 years ago

(2.5A peak × 0.707)^2 × 4Ohm is 13 Watt, right

rbrtkurtz

11 years ago

Who said anything about 7W? @Hurz, I skipped the rms bit. I'm with you on that one. If we're taking about RMS power, it's 13W.

faceblast

11 years ago

output power is measured by the weight of plaster that breaks off the ceiling

thebugger

11 years ago

It may be 13W but thats sinusoidal. Musical power is a lot higher

wyoelk

11 years ago

What class of amp is this? It looks like a series of A class amps, both single and darlington pair,coupled together with a B class on the end. Wouldn't each section improve output effeciency being all NPN transistors and then stabilize and improve the output V and I to shake at least the light fixtures

thebugger

11 years ago

The class A staged should provide the large voltage and current gain needed for the class B amp. The efficiency seems to get improved by the LC filter on the power supply. The class B stage also helps improving the efficiency.

faceblast

11 years ago

MUSICAL POWAR

thebugger

11 years ago

Yes musical power is always higher than the RMS sinewave power. Sometimes it may even be as twice as high.

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