[GreenKeys] How hot is too hot? (Teletype 32)

[Henning Treumann]

European (or better non Teletype) machines use a very sensitive polarized
relay to detect
the current loop reversing of the TW39 system which switches the motor
power relay after
an incoming call.
Hence stand-by power usage of an European Telex control unit is almost
nothing.

I would install the mentioned resistors on a small distance to the PCBs.

And yes... it should be online 24/7 - that's the fun of i-Telex. :-)

73
Henning DF3OE
i-Telex 925302

www.i-telex.net
www.telexforum.de



Am Mo., 5. Sept. 2022 um 22:54 Uhr schrieb Paul Heller <paul0926 at comcast.net
>:

> Nice machine!
>
> A fan is an interesting idea. A small one that runs off 120vac perhaps.
>
> I don’t have that insulator in mine and I think Wayne’s suggestion to
> remove it is a good one. I often leave the lid opened to let air circulate
> in there.
>
> It seems like a bad design. The European machines have a relay which is
> much better. I don’t know how they dissipate power from the small amount of
> loop current when not in a call, but I’ve not noticed heat build up in
> them. Yes it gets pretty warm and I often worry about that but so far all
> is doing ok on my machine. I do power it off when going away for any
> extended amount of time.
>
> Paul
> W2TTY
>
> > On Sep 5, 2022, at 4:37 PM, Andy KN4UCL <kn4ucl at gmail.com> wrote:
> >
> > 
> > Hey folks, I recently got my M32 up and running on i-Telex and all is
> good but things are getting a little toasty and I am not sure how much I
> need to worry.  Please see attachments - the circles I drew show where it's
> getting hot.  120-130F if my Harbor Freight thermometer is to be believed.
> >
> > As there is quite a bit of room in there, I was wondering if a small fan
> would be helpful.
> >
> > Any thoughts appreciated!
> >
> > thanks
> > Andy
> >
> >
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