KAP 500 Remote ON/OFF Via AUX Conn

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KAP 500 Remote ON/OFF Via AUX Conn

DAVID INGEBRIGHT
I'm wanting to utilize the AUX connector pins on my KPA 500 to remotely turn on and off the amplifier. The interface diagram on pg 25 of the manual shows pins 8 and 12 can be momentarily shorted to control the power. (#8 grounded) My plan is to do this via a 1216 webswitch. But when I touch 8 and 12 together, nothing happens. I've checked and verified all plugs tight and pins are correct. Possibly I need to pull 8 low with -12volts? I know a lot of you leave your amp in STBY all the time but I'd like the flexibility to turn it off and on remotely with extra contacts on the webswitch.
Thanks de dave WB7ELY
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Re: KAP 500 Remote ON/OFF Via AUX Conn

Nr4c
WIN4kK3 does this function. Maybe you can determine how.

Sent from my iPhone
...nr4c. bill


> On Oct 31, 2019, at 3:42 PM, DAVID INGEBRIGHT <[hidden email]> wrote:
>
> I'm wanting to utilize the AUX connector pins on my KPA 500 to remotely turn on and off the amplifier. The interface diagram on pg 25 of the manual shows pins 8 and 12 can be momentarily shorted to control the power. (#8 grounded) My plan is to do this via a 1216 webswitch. But when I touch 8 and 12 together, nothing happens. I've checked and verified all plugs tight and pins are correct. Possibly I need to pull 8 low with -12volts? I know a lot of you leave your amp in STBY all the time but I'd like the flexibility to turn it off and on remotely with extra contacts on the webswitch.
> Thanks de dave WB7ELY
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
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> Please help support this email list: http://www.qsl.net/donate.html
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Re: KAP 500 Remote ON/OFF Via AUX Conn

Elecraft mailing list
In reply to this post by DAVID INGEBRIGHT
Do you have the rear panel switch on? Pin 8 is in parallel with the front panel pushbutton, so it will power on/off the KPA500 under the same conditions as the front panel power button.

73!
Jack, W6FB


> On Oct 31, 2019, at 12:35 PM, DAVID INGEBRIGHT <[hidden email]> wrote:
>
> I'm wanting to utilize the AUX connector pins on my KPA 500 to remotely turn on and off the amplifier. The interface diagram on pg 25 of the manual shows pins 8 and 12 can be momentarily shorted to control the power. (#8 grounded) My plan is to do this via a 1216 webswitch. But when I touch 8 and 12 together, nothing happens. I've checked and verified all plugs tight and pins are correct. Possibly I need to pull 8 low with -12volts? I know a lot of you leave your amp in STBY all the time but I'd like the flexibility to turn it off and on remotely with extra contacts on the webswitch.
> Thanks de dave WB7ELY
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

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KAP 500 Remote ON/OFF Via AUX Conn

ANDY DURBIN
In reply to this post by DAVID INGEBRIGHT
"But when I touch 8 and 12 together, nothing happens"

What is the open circuit voltage on pin 8?   It's not a complex circuit and, except for connectors and cables, the only thing that would stop it working is a failure of diode D4 which is a BAT54.

Andy, k3wyc
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