6 channel Speaker Protection and power on delay

sachi · 18th November 2005, 03:29 PM

Hey all,
I am in the process of assembling my six channel amplifier for my 3 way active speaker project.

I am using two 4780 in bridged mode to drive the woofers and two 4780s in parallel mode to drive the midranges while the 3886s are driving the tweeters.

Before i finalise the layout and start assembling the amp, i want to know how to add an inexpensive and easy to build(with as little components as possible) DC speaker protection circuit with a soft start circuit for all six channels.

I am using an active xover(http://www.siliconchip.com.au/cms/A_30278/article.html)
along with a ALPS RK27 10k log pot as passive pre all in the same amplifier case.

I would appreciate if you guys could give me suggestions on the speaker protection circuitry as the speakers are fairly expensive.
Vifa D27s, Scan speak M13/8640 and Dayton classic 10s.

Thanks,

Sachi

Nordic · 18th November 2005, 04:26 PM

Maybe look at http://sound.westhost.com/project33.htm for some starting ideas.

sachi · 18th November 2005, 04:29 PM

Hey Nordic,
Have gone through that..
the number of compoenets for a six channel protection system would exceed the number of components i have used on all six gainclone boards..

Isn't there something more simple with a reduced component count.

Nordic · 18th November 2005, 04:39 PM

Dunno man, the protection circuit in the Mauro amp also has like 3 transistors, some diodes and caps.. although the layout is quite compact, maybe fits in 3 x 2cm of PCB... have a look at the thread for the circuit... not sure though how much protection it offers as it also serves as a softstart, with relay.

The components you mention are small stuff like diodes and resistors, surely you could even fit it on a small bit of veroboard...

sachi · 18th November 2005, 04:41 PM

Thanks..will take a look at it..i assume ur referring to this thread
My "audiophile" LM3886 approach

Nordic · 18th November 2005, 04:43 PM

http://www.diyaudio.com/forums/attac...amp=1131546741

THE BIT TO THE TOP RIGHT

sachi · 18th November 2005, 04:58 PM

Thanks!

18th November 2005, 03:29 PM	#1
sachi diyAudio Member Join Date: Dec 2003 Location: Silicon Forest	6 channel Speaker Protection and power on delay Hey all, I am in the process of assembling my six channel amplifier for my 3 way active speaker project. I am using two 4780 in bridged mode to drive the woofers and two 4780s in parallel mode to drive the midranges while the 3886s are driving the tweeters. Before i finalise the layout and start assembling the amp, i want to know how to add an inexpensive and easy to build(with as little components as possible) DC speaker protection circuit with a soft start circuit for all six channels. I am using an active xover(http://www.siliconchip.com.au/cms/A_30278/article.html) along with a ALPS RK27 10k log pot as passive pre all in the same amplifier case. I would appreciate if you guys could give me suggestions on the speaker protection circuitry as the speakers are fairly expensive. Vifa D27s, Scan speak M13/8640 and Dayton classic 10s. Thanks, Sachi

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18th November 2005, 04:26 PM	#2
Nordic diyAudio Member Join Date: Sep 2005	Maybe look at http://sound.westhost.com/project33.htm for some starting ideas.

18th November 2005, 04:29 PM	#3
sachi diyAudio Member Join Date: Dec 2003 Location: Silicon Forest	Hey Nordic, Have gone through that.. the number of compoenets for a six channel protection system would exceed the number of components i have used on all six gainclone boards.. Isn't there something more simple with a reduced component count.

18th November 2005, 04:39 PM	#4
Nordic diyAudio Member Join Date: Sep 2005	Dunno man, the protection circuit in the Mauro amp also has like 3 transistors, some diodes and caps.. although the layout is quite compact, maybe fits in 3 x 2cm of PCB... have a look at the thread for the circuit... not sure though how much protection it offers as it also serves as a softstart, with relay. The components you mention are small stuff like diodes and resistors, surely you could even fit it on a small bit of veroboard...

18th November 2005, 04:41 PM	#5
sachi diyAudio Member Join Date: Dec 2003 Location: Silicon Forest	Thanks..will take a look at it..i assume ur referring to this thread My "audiophile" LM3886 approach

18th November 2005, 04:43 PM	#6
Nordic diyAudio Member Join Date: Sep 2005	http://www.diyaudio.com/forums/attac...amp=1131546741 THE BIT TO THE TOP RIGHT

18th November 2005, 04:58 PM	#7
sachi diyAudio Member Join Date: Dec 2003 Location: Silicon Forest	Thanks!

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