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Old 27th March 2002, 03:15 PM   #1
palesha is offline palesha  India
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Default Protection circuit

I am building one discreet 100w home subwoofer. Audio activated on & off ( after the audio signal missing for 15 minutes) plus dc offset protection circuit is required. I have seen one circuit with single relay in one subwoofer circuit. I will like to see if our diy friends have built the similar circuit. otherwise suggestions in the matter will be appreciated.
Mahendra Palesha
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Old 27th March 2002, 05:05 PM   #2
tiroth is offline tiroth  United States
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Rod Elliots' Project 33

(You'll need to supply the timer circuit externally.)
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Old 27th March 2002, 05:26 PM   #3
fcel is offline fcel  United States
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How about this?
http://www.audioxpress.com/bksprods/kits/kv-k4700U.htm
http://www.audioxpress.com/bksprods/kits/kv-k4701.htm
I'm thinking of using item #KV-K4700U for my ZEN amp or BOSOZ pre-amp myself. What do you guys think?
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Old 27th March 2002, 09:08 PM   #4
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Quote:
Originally posted by tiroth
Rod Elliots' Project 33
Great project. I built one with minor mods and works flawlessly.
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Old 28th March 2002, 05:29 AM   #5
palesha is offline palesha  India
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Dear Lisandro_P,
Can u let us know what modification u have carried on the circuit as mentioned?
Thanks
Mahendra Palesha
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Old 28th March 2002, 06:13 AM   #6
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Well, for starters i used one circuit for each channel instead of a single one driving the two relays at once. On the ac detector i used two 22uF polarized electros back-to-back in series, bypassed with 1uF multylayer instead of the 10uf NP; used a 12v zenner instead of the 24v ones for the back-emf protection; added two yellow leds to indicate when the channels are muted and the ability to mute the amp with a switch.
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