Re: Topband: Detuning Relay Flyback Diode

[David Cutter via Topband <topband@contesting.com>]

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" <bpease2@myfairpoint.net>
To: <topband@contesting.com>
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
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