[GreenKeys] Auto Machine Power Switch

[John, W9DDD]

I wish I could recall the details, but long ago I found a timer that 
once triggered would close a power contact,  time for 5 minutes and then 
open it's contact.  It was a sealed mil-spec device.  I don't recall 
what relay I used to trigger it, don't think I used a 255 since it would 
be switching 120 VAC.  (or maybe I was dumb lucky)  I probably used some 
odd DC relay I had in the junk box.  I wonder if I still have that in 
the garage.

Today you'd use an optical coupler to monitor the loop current and 
feeding into a 555 timer controlling some sort of solid state power relay.

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You said "tomorrow" yesterday.

The above comments or recommendations are SWAG. Use at your own risk.
John, W9DDD

On 12/8/2023 8:02 AM, Daniel Jones wrote:
> I use a TU-170 for my machines for autostart which is convenient  because it automatically powers up the machine upon receiving a signal. I would like to build something that would allow me to do the same for 850 shift that would allow me to leave my machines on while using my military gear.
>
> I guess it could be audio driven or even loop driven (once it detects loop activity it turns the motor on) I would prefer a loop driven option as it would eliminate the need to differentiate between 170/850.   I could install it close to the machine if it was in a different room on an extended loop run ect…
>
> Does anyone have any ideas on a good workable solution?
>
> Daniel
>
>
>
> www.K6YIC.com
> DJones at K6YIC.com
> HH#11973
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