[Elecraft] K3: reverse 12 volt supply

[James F. Boehner MD via Elecraft]

Whew!

Not a good feeling-but it can happen to any of us, regardless of how careful
we are.

Elecraft has been very good on suggesting helpful modifications to the
radio.  Any thoughts? Perhaps an in-line diode?

I'm not sure if that would result in a significant voltage drop-just a
thought.

'73 de JIM N2ZZ


-----Original Message-----
From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of roger
wood
Sent: Sunday, September 13, 2015 1:24 PM
To: Elecraft
Subject: [Elecraft] K3: reverse 12 volt supply

I managed to connect a 12 volt car battery backwards to the K3.

There was a lot of smoke and the breaker popped.  The RX and TX appear to
have survived, however the internal 100 Watt amplifier now shows an
over-current fault and quickly switches off.  I haven't dared open it up yet
- far too depressed now. I'll leave it till next  weekend.

Any comments on what I might expect to find inside and how to idiot-proof it
for my future operation?

73
Roger
KK3RW / G3WEW
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