Over-voltage protection...

C

Cursitor Doom

Guest
Hi all,

I have a Yaesu FT857 transceiver which requires a nominal supply of
13.8VDC. I accidentally fed it with 30VDC and something went \'phut\'
after about 60 seconds and there was a whisp of smoke. Nothing too
dramatic, but it no longer works. I\'d forgotten it has an on-off
switch which doesn\'t entirely isolate the supply. The thing was
switched off at the time this happened so whatever\'s burned-up must
have still been connected internally despite that.
I\'m guessing this radio will have some kind of over-voltage protection
built in, but how is this protection typically implemented? Is there
anything to particularly look for?

-CD
 
Cursitor Doom schrieb:
Hi all,

I have a Yaesu FT857 transceiver which requires a nominal supply of
13.8VDC. I accidentally fed it with 30VDC and something went \'phut\'
after about 60 seconds and there was a whisp of smoke. Nothing too
dramatic, but it no longer works. I\'d forgotten it has an on-off
switch which doesn\'t entirely isolate the supply. The thing was
switched off at the time this happened so whatever\'s burned-up must
have still been connected internally despite that.
I\'m guessing this radio will have some kind of over-voltage protection
built in, but how is this protection typically implemented? Is there
anything to particularly look for?
Click to expand...

In any case,

here <https://elektrotanya.com/yaesu_ft-857_sm.pdf/download.html>

you can download the manual.

HTH

Reinhard
 
On Sun, 26 Mar 2023 19:33:22 +0200, Reinhard Zwirner
<reinhard.zwirner@t-online.de> wrote:

Cursitor Doom schrieb:
Hi all,

I have a Yaesu FT857 transceiver which requires a nominal supply of
13.8VDC. I accidentally fed it with 30VDC and something went \'phut\'
after about 60 seconds and there was a whisp of smoke. Nothing too
dramatic, but it no longer works. I\'d forgotten it has an on-off
switch which doesn\'t entirely isolate the supply. The thing was
switched off at the time this happened so whatever\'s burned-up must
have still been connected internally despite that.
I\'m guessing this radio will have some kind of over-voltage protection
built in, but how is this protection typically implemented? Is there
anything to particularly look for?

In any case,

here <https://elektrotanya.com/yaesu_ft-857_sm.pdf/download.html

you can download the manual.

HTH

Reinhard
Click to expand...

Yeah, thanks for that.
I had one of those \'iightbulb moments\' at 3am: a crowbar! Can\'t think
why I\'d overlooked that. Just hope the damn thing had a fuse in the
power lead!
 
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