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Old 22nd August 2006, 01:57 PM   #1
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Default Loudspeaker protection


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?
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Old 23rd August 2006, 01:50 AM   #2
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HI Nick:
Try using either NEC UPC-1237H, or Toshiba TA-7317P.
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Old 23rd August 2006, 02:47 AM   #3
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Old 23rd August 2006, 09:10 AM   #4
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How about this :


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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Old 23rd August 2006, 04:31 PM   #5
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Default 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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Old 23rd August 2006, 04:32 PM   #6
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the schematic in pdf format.Any comment are very appreciated.
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File Type: pdf protection.pdf (14.7 KB, 244 views)
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