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2025-03-20 20:26:26 UTC

Søren Kjærsgaard on Nostr: So when you have a bunch of jellybean JFETs (2N5457) and a handful of 1uF bipolar ...

So when you have a bunch of jellybean JFETs (2N5457) and a handful of 1uF bipolar capacitors…
What to do.. 🤷🏼‍♂️🤓

I decided to build a simple amplifier 😃 Although many find JFETs aren’t quite as intuitive as a regular BJTs, they’re not THAT scary 👻😂 and they’re easily biased, using a megaohm sized resistor from the gate to ground.

To be able to do some more accurate calculations, I decided to measure the maximum drain current, IDSS, and the negative Gate-Source cut-off (pinch off) voltage, as they can vary significantly even between devices even from the same batch.

A fun evening in the lab 😃

#electronics #rfengineer #electronicsengineering #EE #testandmeasurement #hamradio #hamr