[GreenKeys] Flesher TU-170 Loop Key Transistor

[hwhall at compuserve.com]

I've built keyers using that transistor and always had an RC snubber across them.

WayneWB4OGM

-----Original Message-----
From: Harold Hallikainen <harold at mai.hallikainen.org>
To: Green Keys <greenkeys at mailman.qth.net>
Sent: Fri, Oct 30, 2020 8:20 pm
Subject: [GreenKeys] Flesher TU-170 Loop Key Transistor


I'm looking at the manual for the TU-170 and see that it keys the loop
with an MJE340 which has a maximum Vce of 300 V. 152950 loop supply has a
loaded output voltage of 125 V. Can the MJE340 take the inductive spike
when it opens the loop, or should a clamp be added?

Thanks!

Harold



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