[GreenKeys] Leaving ASR-33 powered on...?

[Steve Garrison]

Jack Hart, K2TTY, had a motor control card several years back that sensed the loop current and after a “timed” interval it could activate (or deactivate if you prefer) a relay to shut the machine off.

 

I just installed one in a blank space in the LESU of one of my M28 KSRs.  Rewired the LESU to just turn only the motor off and leave power to the machine on.

 

Steve G./N4TTY

 

From: greenkeys-bounces at mailman.qth.net <greenkeys-bounces at mailman.qth.net> On Behalf Of Jordan Spencer Cunningham
Sent: Monday, November 26, 2018 1:39 PM
Cc: Green Keys <greenkeys at mailman.qth.net>
Subject: Re: [GreenKeys] Leaving ASR-33 powered on...?

 

It just so happens that an idle line timer dropped on eBay over the weekend along with a handful of 28s and other equipment (someone must be clearing out their stash as it's all from the same seller and for reasonable prices considering there are people on eBay trying to sell 15s in pretty bad shape for thousands of dollars!):

 

https://www.ebay.com/itm/Teletype-Idle-Line-Motor-Control/132849886265

 

No relation to seller and other such standard disclaimers.

 

You could probably build one of these yourself, though I don't know exactly what the guts would be. I'm controlling my 15 and 19 through a Raspberry Pi, and I have the Raspberry Pi set up to control some relays for the motors and current loops. Since I know via software when the loops are going to turn on and messages come through, I didn't have to build anything special like this to sense when the loop is idle or not-- the Pi just switches on the loop, the motor, and then sends messages through the loop. Pretty neat contraption, though-- I'd never heard of them before I saw this one show up on eBay.

 

--Jordan

 

On Mon, Nov 26, 2018 at 11:25 AM tony.podrasky <tony.podrasky at gmail.com <mailto:tony.podrasky at gmail.com> > wrote:

There was a thing called an "idle line timer".

You'd connect it into the loop, and plug the teletype
into its outlet. When the loop keyed, it closed a relay
and the machine would come to life. You could adjust the
timing of how long it would keep the relay closed.

It might be "me" - but I wouldn't leave the 33-ASR running
if it's not being used - it's almost entirely hardware and
there is only so much life in the machine.

UE,
K2EAA - TONY
NNNN
ZCZC


On 11/26/2018 10:05 AM, Barnett, Andy wrote:
> Hi folks, I know the ASR-33 is a light duty machine and apologies if
> this has been covered before, but I would appreciate your thoughts –
>
> 1.            OK to leave my ASR-33 powered up and running? (but not
> printing much, mostly waiting)
>
> 2.            Has anyone ever built a gizmo that powers on the Teletype
> from cold when there’s some activity on the serial line… and perhaps
> powers off after no activity after a while?
>
> Thanks!
>
> Andy
>
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-- 
On two occasions I have been asked [by members of
Parliament!], "Pray, Mr. Babbage - if you put into the
machine WRONG FIGURES, will the RIGHT ANSWERS come out?"
I am not able rightly to apprehend the kind of confusion
of ideas that could provoke such a question.
Charles Babbage - inventor of the analog engine (1st CPU)
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