Topband: Detuning Relay Flyback Diode

Brian Pease bpease2 at
Sun Dec 24 12:18:02 EST 2017

I am sure that some rigs use an "open drain" MOSFET instead of a 
"normal" transistor.  The built-in "body diode" of the MOSFET acts as a 
built-in snubber for the reverse polarity transient, and should easily 
handle the current.

On 12/24/2017 11:49 AM, Paul Christensen wrote:
> A single-component option with the benefits of the combo diode/Zener that Jim described is a “Transorb” device. The link below opens an application note that discusses various forms of coil transient suppression, beginning with passive, then single diode, a combo diode-Zener (mentioned by Jim and recommended by Schrack) and then concludes with the “Transil,” ST’s trade name for their transorb device.
> Paul, W9AC
> Sent from my iPhone8
> _________________
> Topband Reflector Archives -

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