Protection circuit

palesha · 27th March 2002, 03:15 PM

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

tiroth · 27th March 2002, 05:05 PM

Rod Elliots' Project 33

(You'll need to supply the timer circuit externally.)

fcel · 27th March 2002, 05:26 PM

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?

Lisandro_P · 27th March 2002, 09:08 PM

Quote:

Originally posted by tiroth
Rod Elliots' Project 33

Great project. I built one with minor mods and works flawlessly.

palesha · 28th March 2002, 05:29 AM

Dear Lisandro_P,
Can u let us know what modification u have carried on the circuit as mentioned?
Thanks
Mahendra Palesha

Lisandro_P · 28th March 2002, 06:13 AM

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.

27th March 2002, 03:15 PM	#1
palesha diyAudio Member Join Date: Nov 2001 Location: Pune India	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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27th March 2002, 05:05 PM	#2
tiroth diyAudio Member Join Date: Dec 2001 Location: Pittsburgh, PA, USA	Rod Elliots' Project 33 (You'll need to supply the timer circuit externally.)

27th March 2002, 05:26 PM	#3
fcel diyAudio Member Join Date: Sep 2001 Location: LA County	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?

28th March 2002, 05:29 AM	#5
palesha diyAudio Member Join Date: Nov 2001 Location: Pune India	Dear Lisandro_P, Can u let us know what modification u have carried on the circuit as mentioned? Thanks Mahendra Palesha

28th March 2002, 06:13 AM	#6
Lisandro_P diyAudio Member Join Date: Oct 2000 Location: Argentina	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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