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,...