Loudspeaker protection

harrisni · 22nd August 2006, 01:57 PM

Hi,

Im putting together a stereo amplifier and just wondering if anyone knows of a good loudspeaker protection module I can use? I notice jaycar/altronics have, does anyone design there own?

audiohead · 23rd August 2006, 01:50 AM

HI Nick:
Try using either NEC UPC-1237H, or Toshiba TA-7317P.
regards,
Art

Leolabs · 23rd August 2006, 02:47 AM

http://sound.westhost.com

bigpanda · 23rd August 2006, 09:10 AM

How about this :

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

But this is for a 60v DC supply and I had the modified bom for a 33v DC (ie 24v AC before rectification).

parsecaudio · 23rd August 2006, 04:31 PM

A very valid circuit,more reliable than the TA7317 or uPC1237 and easy to built is this(with blinking LED).
The description are very simple:when a DC voltage are detected,the output of X1 are low or high depending to DC voltage.When a positive offset voltage occour,the X2 output quite low and D1 short the gate of M1 to approx negative supply.This cause relay to open.Similarly for the negative offset(same but for X3).
The initial turn on delay may be set with R7-R12/C3 and the LED blinking time varying R14/C8.
The off response of this circuit are very fast(depending on the relay characteristic).

parsecaudio · 23rd August 2006, 04:32 PM

the schematic in pdf format.Any comment are very appreciated.
Thanks

22nd August 2006, 01:57 PM	#1
harrisni diyAudio Member Join Date: Aug 2006	Loudspeaker protection Hi, Im putting together a stereo amplifier and just wondering if anyone knows of a good loudspeaker protection module I can use? I notice jaycar/altronics have, does anyone design there own?

23rd August 2006, 04:31 PM	#5
parsecaudio diyAudio Member Join Date: Apr 2004 Location: ventimiglia	Protection circuit A very valid circuit,more reliable than the TA7317 or uPC1237 and easy to built is this(with blinking LED). The description are very simple:when a DC voltage are detected,the output of X1 are low or high depending to DC voltage.When a positive offset voltage occour,the X2 output quite low and D1 short the gate of M1 to approx negative supply.This cause relay to open.Similarly for the negative offset(same but for X3). The initial turn on delay may be set with R7-R12/C3 and the LED blinking time varying R14/C8. The off response of this circuit are very fast(depending on the relay characteristic).

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23rd August 2006, 01:50 AM	#2
audiohead diyAudio Member Join Date: Mar 2005 Location: Los Angeles, california	HI Nick: Try using either NEC UPC-1237H, or Toshiba TA-7317P. regards, Art

23rd August 2006, 02:47 AM	#3
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	http://sound.westhost.com

23rd August 2006, 09:10 AM	#4
bigpanda diyAudio Member Join Date: Jun 2004 Location: HKSAR	How about this : http://users.otenet.gr/~athsam/protection_2_EN.htm But this is for a 60v DC supply and I had the modified bom for a 33v DC (ie 24v AC before rectification).

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