[Elecraft] KPA500 fans

[Ken K6MR]

Nope. Just tried it (I had to know).



The fan is controlled by the uC via a BJT and voltage regulator controlled by FETs. Without standby power everything turns off.



Ken K6MR



From: john at kk9a.com<mailto:john at kk9a.com>
Sent: Wednesday, February 1, 2017 5:56 PM
To: elecraft at mailman.qth.net<mailto:elecraft at mailman.qth.net>
Subject: [Elecraft] KPA500 fans



If the fans are running on the capacitor charge when the amp is turned off,
wouldn't they still run if you pulled the plug?

John KK9A



Don Wilhelm wrote:

John,

Because after power off, the fans are powered by the charge in the
KPA500 capacitors discharging, I do not think that is a requirement -
but not a bad idea in any case.

73,
Don W3FPR

On 2/1/2017 7:53 PM, John Marvin wrote:
> I know this thread is supposed to be closed now, and hopefully this
> would be obvious, but you should also wait for the fans to stop before
> "pulling the plug". You should always turn the KPA500 off with the
> switch (or the KPA utility) first, wait for the fans to stop, then you
> can use the back switch or a power cord switch.

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