Re: Easy, Inexpensive Cooling Fan, Excelway Case

Jim Sheldon
 

Hey Arv,
If you try the "snubber" diode, you might put a .1uf or maybe even higher value cap across the diode to help take down the little overshoots that will occur even with the diode in most cases.  

Jim, W0EB

------ Original Message ------
From: "Arvo KD9HLC via Groups.Io" <arvopl@...>
Sent: 7/2/2018 8:48:36 AM
Subject: Re: [BITX20] Easy, Inexpensive Cooling Fan, Excelway Case

On Sat, Jun 30, 2018 at 04:32 pm, n4eev wrote:
Arv, you are one smart dude! I love your idea.
Haha, well, there are always unforeseen complications.

On mine, when I open PTT the fan coasts down and I'm guessing acts like a little magnetic generator and puts quite the whir into the AF signal for a second or two.  I'm thinking the DC pulses produced by the freewheeling fan are of opposite polarity from the PS, so I could snub them with a diode, right?

Does sound kinda cool, though.  Maybe not as cool as a "Roger beep" and nobody else (I hope) can hear it.

That's what I get for testing the idea on WSPR with the volume all the way down.

Join BITX20@groups.io to automatically receive all group messages.