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Old 18th November 2005, 03:29 PM   #1
sachi is offline sachi  United States
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Default 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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Old 18th November 2005, 04:26 PM   #2
Nordic is offline Nordic  South Africa
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Maybe look at http://sound.westhost.com/project33.htm for some starting ideas.
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Old 18th November 2005, 04:29 PM   #3
sachi is offline sachi  United States
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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.
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Old 18th November 2005, 04:39 PM   #4
Nordic is offline Nordic  South Africa
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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...
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Old 18th November 2005, 04:41 PM   #5
sachi is offline sachi  United States
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Thanks..will take a look at it..i assume ur referring to this thread
My "audiophile" LM3886 approach
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Old 18th November 2005, 04:43 PM   #6
Nordic is offline Nordic  South Africa
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http://www.diyaudio.com/forums/attac...amp=1131546741

THE BIT TO THE TOP RIGHT
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Old 18th November 2005, 04:58 PM   #7
sachi is offline sachi  United States
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Thanks!
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