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Michael Rothacher Michael Rothacher is offline

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  • Join Date: 25th May 2001

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Latest Blog Entry

Posted 6th March 2016 at 03:05 PM by Michael Rothacher Comments 0
Achievement Unlocked: 75 Watt Class A Zero Feedback SIT Circlotron


Soft clipping at 75W

Because of the high input capacitance of the 2SK180’s and the gain of this circuit, we have to pull out all the stops to get our 75W beast to make audio bandwidth. Here you can see that each SIT is getting its own transformer and buffer.






Posted 26th October 2015 at 04:50 PM by Michael Rothacher Comments 0
Posted in Uncategorized
Here's the link to Nelson's presentation at BAF 2015:

Pass Presentation BAF 2015

Slides are available in pdf. See the video description for the link.

Posted 7th May 2014 at 10:16 PM by Michael Rothacher Comments 1
Posted in Uncategorized

Posted 1st November 2013 at 12:56 AM by Michael Rothacher Comments 0
Posted in Uncategorized
Ironamp project video posted here:

https://www.youtube.com/watch?v=FZymAeaVsAg

I hope you enjoy it.

I updated the captions if you want to try Youtube's translation option - should be funny

Posted 26th November 2011 at 11:24 PM by Michael Rothacher Comments 0
Posted in Uncategorized
The topic of JFET and MOSFET matching comes up often in the forums, so I thought I'd show you the jigs I use.

First up, is my trusty old JFET IDSS matcher.



There's a 9V battery inside, and the meter probes are conneted across a 10 Ohm resistor which is connected to the JFET drain. I included a polarity switch for convenience when testing P channel parts.

It's pretty easy to connect the microclips, count to five, and take a reading.



And here's what I use for the big stuff. This is my MOSFET Vgs matcher.



First, I install a sample part and let it warm up for about an hour. There's a thermistor hot-glued to the heat sink,...
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