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K3 overvoltage protection

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G4HUE

K3 overvoltage protection

Hi guys, I am a new owner of a K3 serial number 6990 (must say I am mighty impressed by it) and considering its cost I wondered if it had overvoltage protection. I dread the thought of destroying my K3 due to PSU failure! I have searched the past postings and cannot find anything relevant to the K3.

If not I will make up ma "crowbar" circuit.

Andy G4HUE

Poul Erik Karlshøj (PKA)-2

Re: K3 overvoltage protection

Andy there is a Zener diode (BZW50-15) protection.
I have not been bold enough to actually testing it :-)
Download the schematics
http://www.elecraft.com/manual/K3_Schematics_Jun_2010.pdf
and look for (use Search function) for D28 .
73/OZ4UN
-----Oprindelig meddelelse-----
Fra: [hidden email] [mailto:[hidden email]] På vegne af G4HUE
Sendt: 15. december 2012 13:26
Til: [hidden email]
Emne: [Elecraft] K3 overvoltage protection

Hi guys, I am a new owner of a K3 serial number 6990 (must say I am mighty impressed by it) and considering its cost I wondered if it had overvoltage protection. I dread the thought of destroying my K3 due to PSU failure! I have searched the past postings and cannot find anything relevant to the K3.

If not I will make up ma "crowbar" circuit.

Andy G4HUE

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G4HUE

Re: K3 overvoltage protection

Super - I have now found the diode you mentioned. Thank you very much - it has made me somewhat comfortable now!!

Andy

From: Poul Erik Karlshøj (PKA)-2 [via Elecraft] <[hidden email]>
To: G4HUE <[hidden email]>
Sent: Monday, 17 December 2012, 10:48
Subject: Re: K3 overvoltage protection

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