OPA541 w/ or w/o thermal protection?

[Easyamp]

what are they? like a teperature controlled switch? whats the part number?

Here a link http://www.airpaxtsp.com/tspsite/6600.html#applic

They're pcb thermostats that are either normaly opened or normaly closed and come in various temp's. Pretty handi.

[JojoD818]

Now those little thermostats are really useful in amp designs. Will have to try them soon.

[Matttcattt]

cool. do they offer samples? i will have a look at thier website.

[Easyamp]

Not sure about samples, but they are pretty cheap If I remeber less then a dollar a piece maybe less.

You can find a distributor on the site.

There is however the hassle of making a mounting bracket of some sorts to fix it to the heat sink. It is I beleive supposed to be ambient air temp sensor not a heat sink sensors but whatver it works.

The setup in the picture actually kept the temp of the that tranny and another mounted the same way face to face with the fan on top blowing down within 10 degress +/- of 80 degrees celcius while doing some heavy listening.

[Upupa Epops]

Bimetal temperature sensors have too big hysteresis ( difference between " start on and start off " function ) and are very expensive. Better is to use semiconductor temperature sensor and any opamp connected as comparator.

[Easyamp]

This an exerpt from an airpax data spec's sheet for the 66F060 sensor which is set to trip at 60 degrees celcius.

http://www.airpaxtsp.com/tspsite/6600.html

"Example: A 66F060 thermostat will close (make contact) on a rising temperature from 55º C to 65º C and will reset (break contact) on a falling temperature no less than 4º C lower than the actual close temperature and no lower than 40º C actual temperature."

They give a 30,000 on/off cycles for current loads 1a or less with no drift.

5 degress over 60 versus the range of operating tempatures for most transistors seems fine to me.

[Easyamp]

I don't know why I didn't notice it before but they also have a
to-220 version, so long stupid mounting brackets.

It's the 6700 series, definately better for heat sink mounting.

[Matttcattt]

Originally posted by Easyamp


Here a link http://www.airpaxtsp.com/tspsite/6600.html#applic

They're pcb thermostats that are either normaly opened or normaly closed and come in various temp's. Pretty handi.

thanks