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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

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Old 6th February 2004, 08:04 AM   #11
moamps is offline moamps  Croatia
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Quote:
Originally posted by Peter Daniel
It seems like a perfect setup to use APOX SHM controller here, as one could set permanently offset levels and then adjust all 4 channels simultaniously. By increasing the gain of op amp, one might combine preamp function with high quality active crossover.
Hi,

this is good idea. Also, one another solution is using 4 channel resistor attenuator with proper screening between sections if remote control isn't needed. Tracking between channel and filters in this case must be very good.

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Old 6th February 2004, 08:26 AM   #12
vytas is offline vytas  Lithuania
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Default Nice work

It seems simple and quit good solution!
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Old 6th February 2004, 02:37 PM   #13
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Excellent job Moamps,
Quote:
Originally posted by Peter Daniel
Looking at the schematic, I see you have 10K volume pots for ea. section of the crossover.

It seems like a perfect setup to use APOX SHM controller here, as one could set permanently offset levels and then adjust all 4 channels simultaniously. By increasing the gain of op amp, one might combine preamp function with high quality active crossover.

From the schematics I've seen so far, this one seems to be the most appealing (especially when it's based on XVR1)
If you wanted to get real fancy, you could let the APOX processor do the frequency and slope switching with a set of relays driven from the processor. Than have the frequency and slope displayed on the screen.
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Old 6th February 2004, 03:25 PM   #14
tiroth is offline tiroth  United States
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Very nice work. A project like this was definitely needed. Even for those not biamping this is a great (and inexpensive) tool for designing crossovers.
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Old 6th February 2004, 03:54 PM   #15
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Default group buy

Hello moamps,

Have you consider making and selling the PCBs?

Regards
Chris
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Old 6th February 2004, 04:34 PM   #16
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Default Re: group buy

Quote:
Originally posted by chris ma
Hello moamps,

Have you consider making and selling the PCBs?

Regards
Chris
Since my spare time is very limitated I can't but agree with Chris, also providing the main components (I.E. the double fet and the resistor/capacitors array) would be very appreciated.

Cheers

Andrea
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Old 6th February 2004, 05:23 PM   #17
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Default Re: group buy

Quote:
Originally posted by chris ma
Hello moamps,

Have you consider making and selling the PCBs?

Regards
Chris
I would be in for that as well, multiples.
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Old 6th February 2004, 05:40 PM   #18
jam is offline jam  United States
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Good job Moamps!

..........Rodd will buy anything.

Regards,
Jam
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Old 6th February 2004, 06:31 PM   #19
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Quote:
Originally posted by jam
..........Rodd will buy anything.
What are you selling Jam, anything?
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Old 6th February 2004, 07:12 PM   #20
jam is offline jam  United States
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Not today Rodd...............but I am reading this new book......
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