From a relay hold-on point of view, this will perform very similarly to the
diode across the relay.
David
G3UNA
----- Original Message -----
From: "Brian Pease" <[email protected]>
To: <[email protected]>
Sent: Sunday, December 24, 2017 5:18 PM
Subject: Re: Topband: Detuning Relay Flyback Diode
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.
https://tinyurl.com/ydyy8pqt
Paul, W9AC
Sent from my iPhone8
_________________
Topband Reflector Archives - http://www.contesting.com/_topband
_________________
Topband Reflector Archives - http://www.contesting.com/_topband
_________________
Topband Reflector Archives - http://www.contesting.com/_topband
