Re: mini mosfet audio amp design

On Mar 20, 7:49 pm, John Larkin
<jjlar...@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
On Thu, 20 Mar 2008 19:32:43 -0700 (PDT), mrdarr...@xxxxxxxxx wrote:
Here's an interesting schematic:

http://www.redcircuits.com/Page123.htm

I was wondering what R7 would be connected to. (It's not clear in the
picture.)

What do you guys think of the schematic, overall? A good project for
a beginner?

Michael

That's some goofy European schematic convention. R4 is a pot, and R7
is connected to its wiper. R4 sets the fet idle currents.

It's OK as a project I guess. R3 and R4 wouldn't be necessary if the
bias design were more rigorous, but then you get to play with this
one, and make asymmetric clipping and crossover distortion just for
fun.

You can also fry the fets if you set the pots right/wrong. In fact,
that's pretty much the default setting.

John


Fry the fets if I set the pots right, even?

default setting is Kablooie?

hmm... and here I thought my biggest problem was finding such a large
transformer to drive the thing... I considered taking a surplus ATX
power supply and working between the -12 and +12 VDC to get 24V max.

Thanks,

Michael
.

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