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Old 16th May 2005, 05:04 PM   #1
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Default speaker protection circuit

Find this protection circuit:

http://users.otenet.gr/~athsam/protection_2_EN.htm

and like to try on it. The kyt81-122 is difficult to find so can I use a ntc thermo resistor instead. I would think of feeding R3,R2 into - input of IC1a and R1,ntc into + input of IC1a. Would that work? How are we going to test if this part works? If I am going to glue the sensor to a test heatsink and do the calibration or testing, I might never able taking it off and glue it to the working one? Can I use a pot for R3 so as to adjust the temperature for cut-off.
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Old 17th May 2005, 07:58 PM   #2
moamps is offline moamps  Croatia
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Default Re: speaker protection circuit

Quote:
Originally posted by bigpanda
The kyt81-122 is difficult to find so can I use a ntc thermo resistor instead. I would think of feeding R3,R2 into - input of IC1a and R1,ntc into + input of IC1a. Would that work?
Hi,
Yes.
Quote:
How are we going to test if this part works?
With cheap thermometer or with your fingers.

Bolt NTC on a small sheet of metal on one side. Use your soldering iron and warm up the opposite side. Put your finger on the NTC. Lift your finger up when the NTC gets too hot for you; this means that the the temperature is about 65-70C. Immediately measure NTC resistance. Use the same value for R3. Simple, right?

Quote:
If I am going to glue the sensor to a test heatsink and do the calibration or testing, I might never able taking it off and glue it to the working one?
I wouldn't be in favor of this. A better idea is to use a small piece of metal bolt and a screw. Use thermal grease between the heatsink and NTC.


Quote:
Can I use a pot for R3 so as to adjust the temperature for cut-off.
Yes.

Regards,
Milan
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Old 20th May 2005, 04:46 PM   #3
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Tks Milan,

If I still can't get the kyt81-122 by end of this month, I should try using the ntc thermo-resistor.
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Old 6th June 2005, 01:38 PM   #4
mayky is offline mayky  Hungary
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Look the uPC1237H IC datasheet.

www.alldatasheet.com
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Old 10th June 2005, 06:31 AM   #5
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Tks mayky,

Any schematic for a complete project with the uPC1237H?
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Old 10th June 2005, 05:42 PM   #6
mayky is offline mayky  Hungary
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I find this IC in Rotel RB-1090 schematic.

You can find this here: http://www.eserviceinfo.com



Mayky
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Old 3rd November 2009, 09:41 AM   #7
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Did you tried this?.. is it working?
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