Power Supply for LM3886T.

[Mike]

Hi!
I'm trying to build an audio aplifier using two LM3886s, and since i'm a
beginner im not quite sure what kind of power
supply do i need to build to power the LMs up. Schematics or any hints will
be very appreciated!!
Thank you!!

Mike

 

[John Popelish]

Mike wrote:

Hi!
I'm trying to build an audio aplifier using two LM3886s, and since i'm a
beginner im not quite sure what kind of power
supply do i need to build to power the LMs up. Schematics or any hints will
be very appreciated!!
Thank you!!

Mike

These power amplifiers do not usually need anything fancy in the way
of a supply. You need a transformer with a center tapped secondary
(somewhere around 48 volts total) (or two 24 volt windings you hook in
series) rated for a few amps. Add a bridge rectifier across the whole
secondary and a couple big capacitors (10,000 to 20,000 uf, @ 50
volts), each connected to one of the bridge DC outputs and the other
end to the center tap. Ground the center tap. Don't forget to put a
fuse in the primary. This will provide about + and - 33 volts.

This sort of transformer comes up on ebay quite often. Shipping can
be steep, though.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=4665&item=3818219482
--
John Popelish