modify Velleman kit protection

cld1354 · 1st January 2007, 04:57 PM

Hello,
I bought the dc speakers protections VellemanK4700. I want to use these into a multiway active speakers system so I want that the kit can detects not only a DC at the amp output but also signals below a fixed frequency ( about 100 hz for one channel and 800 Hz for the other channel ). How can I do this? Replacing the C7,C8 (C9,C10) caps?

Link to the circuit http://www.velleman.be/downloads/0/...anual_k4700.pdf

Very thanks

unclejed613 · 1st January 2007, 10:03 PM

link is broken........ part of the url is missing

Zen Mod · 1st January 2007, 10:41 PM

?

cld1354 · 2nd January 2007, 08:13 AM

Sorry,
the complete manual :

http://www.velleman.be/downloads/0/i...nual_k4700.pdf

EchoWars · 2nd January 2007, 11:10 AM

Quote:

but also signals below a fixed frequency

Signals? You mean, operates as if DC has been detected?

Just make C7~C10 small enough to where it starts to operate where you'd like it to.

unclejed613 · 2nd January 2007, 04:27 PM

that's what he seems to be trying to do......... he needs to change A1 and A2 into bandpass filters rather than integrators if he wants to do that...... really no reason to do so because there's no need to protect against out of band signals in a crossover/ biamp/triamp system since they will do no damage. changing the integrators into bandpass filters is not easy

cld1354 · 3rd January 2007, 10:32 AM

Quote:

Originally posted by unclejed613
that's what he seems to be trying to do......... he needs to change A1 and A2 into bandpass filters rather than integrators if he wants to do that...... really no reason to do so because there's no need to protect against out of band signals in a crossover/ biamp/triamp system since they will do no damage. changing the integrators into bandpass filters is not easy

I want to detect DC and/or frequencies ( so that the protection will disconnect the speakers ) below the mid-high xover freq.

It makes sense if you think that it just happened to me that, due to a bad contact in the connector inside the behringer dcx 2496 crossover, my scanspeak 9700 tweteer fried receiving an high volume 'scratch' at
about 100 hz and because there was no cap filter, it died.

Obviously I can solve putting a filter cap on the mid and high way, but this will vanish the positive effects of active filtering

1st January 2007, 04:57 PM	#1
cld1354 diyAudio Member Join Date: Apr 2003 Location: Ancona	modify Velleman kit protection Hello, I bought the dc speakers protections VellemanK4700. I want to use these into a multiway active speakers system so I want that the kit can detects not only a DC at the amp output but also signals below a fixed frequency ( about 100 hz for one channel and 800 Hz for the other channel ). How can I do this? Replacing the C7,C8 (C9,C10) caps? Link to the circuit http://www.velleman.be/downloads/0/...anual_k4700.pdf Very thanks

1st January 2007, 10:03 PM	#2
unclejed613 diyAudio Member Join Date: Dec 2006	link is broken........ part of the url is missing __________________ Vintage Audio and Pro-Audio repair ampz(removethis)@sohonet.net spammer trap: http://www1284177414881.v-dc.net/

2nd January 2007, 04:27 PM	#6
unclejed613 diyAudio Member Join Date: Dec 2006	that's what he seems to be trying to do......... he needs to change A1 and A2 into bandpass filters rather than integrators if he wants to do that...... really no reason to do so because there's no need to protect against out of band signals in a crossover/ biamp/triamp system since they will do no damage. changing the integrators into bandpass filters is not easy __________________ Vintage Audio and Pro-Audio repair ampz(removethis)@sohonet.net spammer trap: http://www1284177414881.v-dc.net/

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2nd January 2007, 08:13 AM	#4
cld1354 diyAudio Member Join Date: Apr 2003 Location: Ancona	Sorry, the complete manual : http://www.velleman.be/downloads/0/i...nual_k4700.pdf

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