Transistor matching

After the carrier block has finished, it's time to match the transistors.

I have built a simple curve tracer from Elektor Electronics (Feb. 2009).

More info about this Transistor Curve Tracer,

http://www.elektor-electronics.co.uk/magazines/2009/february/transistor-curve-tracer.810360.lynkx


And this is mine.




A sample screenshot of a typical 2SJ49 mosfet,

It looks like this.......

Have the TO3 transistor mounted on the carrier block and it fits very well.




More tests to follow.

Good job, boys!

Congratulations!

http://www.abf-online.org/results/ayg09-res.htm#BOTeam2







:-)

Making a new poweramp

I'm in the process of making a new solid state power amp that uses the old but good "Lateral" mosfet by Hitachi. Since they are in To3 package, mounting them onto the heatsink will need some work. I have decided to make a "carrier block". The output transistors will all sitting on the carrier block and then the block will be mounted on the heatsink.

Machining of the carrier block by a small CNC:




This is a test version which will hold two TO3 transistor. The milled block look like this:




We will need a flat surface to ensure good thermal contact with the heatsink, some touch up is then required.




Not too bad I think. :-)