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

P1 preamplifier
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Old 21st September 2017, 01:12 PM   #61
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Thanks Andrew

During assembly these could be mounted on Chassis, the inputs could be configured as both balanced and unbalanced depending on application area, the MP4 AAC is a very interesting standard Advanced Audio Coding - Wikipedia , with a suitable sound card Sound Cards, Audio Cards - Newegg.com . The boards could be configured for 1 channel, 3 channel or more ? need more suggestions on this. all channels may not even need be three way



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Originally Posted by AndrewT View Post
Are AC 1 V1 & AC 1 V3 the balanced impedance audio signal?

If so, then the RF attenuation (C3 & C4) should be connected back to the Chassis socket or to Pin1 and thence to chassis/enclosure. This should be done as close to the chassis socket as possible.
Do not bring the RF interference along wires that can re-radiate EMI into other internal receivers.
I suggest that R27, R8, C3 and C4 be fitted to the input socket, not to the internal wiring.
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Old 29th November 2017, 01:23 PM   #62
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havent send them to the board house yet, there will be different BOMs same layout for different crossover frequencies.
The universal three way being 308Hz and 2kHz, feel free to post your preferred frequencies, chances of these being ready by Christmas is low
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