thermal switched fan?

[Cutlass327]

I have an amp I put an old brushless computer ps fan on, but want to make it thermally switched. I found some thermal switches online, was thinking to use thermal conductor tape to attach it.

Would you put that right on a pill, or on the external heat sink?

Is 45*C sufficient?

 

[sp5it]

On heatsink.
Mike

 

[Big Kahuna]

Let me know which one you use I was looking at some of these the other day.

 

[Cutlass327]

Let me know which one you use I was looking at some of these the other day.

I was thinking these switches and this tape.

 

[2NC995]

My dx1600 has that and the first thing I did was bypass it. I don’t know. Hard to put my faith in, I guess?

 

[Cutlass327]

My dx1600 has that and the first thing I did was bypass it. I don’t know. Hard to put my faith in, I guess?

I can understand that. I figure its rare I'm on it long enough to get warm, its more of a precautionary thing.

 

[Tallman]

I have a schematic that has a variable speed control. If you know how bread board circuits I set the schematic up.

 

[Klondike Mike]

I've used a number of these in my projects (Suscool 121). Although discontinued, you might find some stock somewhere;

http://www.dvtests.com/silverstone-suscool-121-test-and-review/

 

[dave457]

Instead of a thermal switch for fan to kick on.. Just put a temp probe with meter to see how actually hot its getting.... I did this with a small two pill... Works great

 

[Shadetree Mechanic]

Use a big 24v fan on 12v and let it whisper to the amp. I did this with my 203.

 

[Shadetree Mechanic]

I have a schematic that has a variable speed control. If you know how bread board circuits I set the schematic up.

It would be neat if the variable could be controlled by the temperature. So the hotter it gets, the faster the fans goes.

Or maybe a user set low speed to stay relatively quiet and then a temperature switch to kick it into full blast to let the user know to give the amp a break.

 

[Ranch55]

Ideally, you need a switch that closes (turns the fan on) at about 115*.
And then opens (turns fan off) at 100* or less.
I just ordered about a month ago about a dozen Therm-O-Disc 36T switches with a temperature range of 113* close, about 88* open.
That is IF, you do not want the fan running full time .......

 

[Road Squawker]

...edit... the first thing I did was bypass it. I don’t know. Hard to put my faith in, I guess?

Gee, in every transmitter and all but one amp I have the fans are controlled by a thermistor.

 

[Tallman]

It would be neat if the variable could be controlled by the temperature. So the hotter it gets, the faster the fans goes.

Or maybe a user set low speed to stay relatively quiet and then a temperature switch to kick it into full blast to let the user know to give the amp a break.

That is how it works, Hotter=Faster.

 

[2NC995]

Gee, in every transmitter and all but one amp I have the fans are controlled by a thermistor.

I just like them “on” in the mobile.

That’s not to say there’s anything wrong with another approach.