Any crazy idea?

[tadiam1]

Any crazy idea?
Is possible build an all darlington power amplifier?
Ej..bc517...tip122 ...tip142...vas..drivers..power..?
Disrtortion for saturation?

Untitled

[Elvee]

Originally Posted by tadiam1

Any crazy idea?
Is possible build an all darlington power amplifier?

Of course you can.

And you can even go crazier than that: here is a JLH amplifier built purely from voltage regulators:
And now, the Regulator-Chip JLH Amp.

And this is the current crazy project:
Class A Chip Amp: and now, the complementary version

[kenpeter]

JLH Headphone Amp

JLH with 74LS04 Logic Gate

[Elvee]

Originally Posted by kenpeter

JLH Headphone Amp

JLH with 74LS04 Logic Gate

That's a really nice one!

I missed it at the time, but I utterly enjoy it now.

Power to the loonies!!!!

[Preamp]

Here's another one.

I tried to go a bit simpler than Douglas Self with his NE5532-build and hooked up 12 TL074 in parallel, which is 48 single OP amps. The internal circuit looks promising: FET inputs which should be easily paralleled an built-in 200R current sharing resistors at the outputs. I put this thing together on perfboard and powered it with two SMPS-type wall warts.
It actually worked, but not as good as I was hoping for . I used an el-cheapo speaker box for testing and it played music, nice and clean with no audible noises. The scope showed no signs of oscillation or something else, output offset was a couple of millivolts, seemed fine. But the chips got quite warm while in "standby". I don't know how high the quiescent current was, since I don't have a +- Lab supply at hand and was too lazy to hook an ammeter into one of the power lines , but it must have been a bit more than what's stated in the datasheet. Playing only silent music, those tiny bastards became bloody hot. I had to put the whole thing on a heatsink beacuse I was afraid they could unsolder themselves .
According to the maximum dissipation and current output capability of the chips they should be able to hande an 8 Ohm load with ease, but I guess they were rather occupied by fighting themselves...

[CBS240]

A voltage regulator is an amplifier with fb loop ect. There is no reason you can't use Darlingtons. You can skip the driver stage. The thing about Darlington outputs is the thermal feedback loop needs to be as short as possible, or maybe a feedback pair output stage?