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

[Paul Heller]

This is a good idea - stand the resistors off of the board as much as possible. Why not?

Paul
W2TTY
> On Sep 6, 2022, at 10:14 AM, Henning Treumann via GreenKeys <greenkeys at mailman.qth.net> wrote:
> 
> 
> 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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