Sunday, November 20, 2016

Ebay 45W linear amplifier - Heat sink & Bracket

Some pics of the heat sink and bracket that I'll be using during testing.  The heat sink came from a junk PC, and the bracket is bent from 26 gauge copper sheet.

Heat sink and bracket, drilled and tapped.

Bracket mounted to heat sink.

Test fit.

Of course, something always goes sideways when working on any project.  In this case, I planned to use an existing hole in the heat sink (already drilled and tapped) for mounting the 2SC1971 driver, but neglected to measure it first.  As luck would have it, it's too large, so I'll have to fill it with JB Weld, redrill and tap.  That's a project for another day.  


  1. Replies
    1. Hi Dennis,

      Sorry for the delay - I didn't see your comment until now.

      The amplifier kind of works, but I just don't think it's possible to get the advertised 45 watts out of a pair of IRF-530s (or 510s) with 12V on the drains.

      Regardless, I don't think it's a bad deal for <$20, but I'd expect it to NOT work out of the box (bag).

      What became of this amp? I ended up robbing many of the parts from it to build the PA in my "SR-16" rig.