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This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022

Customized input for BL3500/LCS9000

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MKoch

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MKoch Posted: Tue, Jan 18 2022 8:00 PM

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Hello forum - and welcome to my very first post in this forum.

I'm puzzling with re-use of my beatifull and well playing BL3500 mk.1 as soundbar for my Philips TV sourced by an Apple-TV 3rd. gen. Yes - I know this for some of you is close to blasfemia Big Smile

In short these are my thoughts (and any input/feedback is welcome):

Since I don't have anymore Bang & Olufsen products in-house, I need to "interface" the BL3500 a little alternatively. I plan to mount a bluetooth (U2stream) receiver paired with the Apple-TV (preferable inside the BL) and use the USB-C from the Apple-TV to trigger some power for the BL and the BT-receiver (bluetooth is chosen since thats the only audio-output that is controlled/regulated with the Apple remote). The line-out from BT will be applied either via the MCL port or audio-in at the ML plug.

There will be no Beolink to manage the input selection (MCL or ML). And this is where I'm searching for some knowledge conserning the audio processor TDA7318 located in the input-path:

What happens if I short the input with the output ?? Apart from the fact that bus-controlled regulation will be by-passed.

Basicly pin 12/13 short with 23/25 for left, and pin 8/9 short with pin 22/24 for right signal. (Or if ML is better 14/15 to 23/25 and 10/11 to 22/24).

I presume that a positive trigger voltage on MCL pin 6 will turn on the different circuits. Alternatively (now when I'm in there fooling around with a solder-iron) the switch-on could be applied/generated directly "on relay RL1". Might be inverted depending on where.