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 Post subject: Salvage Demod Chips / Circuits
PostPosted: 11 Jan 2017, 01:48 
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Well, I'm a little late to the game, but have focused on Pioneer gear, and their AVRs that incidentally had RF inputs.
It's gotten to where I now have 3 (VXS-09, 39, 59tx...) and only use the 59.
I can find no buyers for the 09 and 39 (old, heavy stuff, yet not quite classic) and would throw out them but...

I would really like to have 2 small demods to feed into small room systems, powered by USB connectors, about the size of a band aid box.

Anyone have any experience with gutting the demod circuit out of Pioneer AVRs?

If I had 10 I could justify the time by recovering 8 or so for others but just 2 will be quite a project.

Anyone else tried similar?
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 Post subject: Re: Salvage Demod Chips / Circuits
PostPosted: 11 Jan 2017, 09:45 
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I've never done it but I can see one possibility that it could work.

If the AC3-RF Demodulator is like a separate board inside any of the AV Receivers in question, it could be as simple as just unplugging it from the main board and saving it for a future project. All a board like that would need is essentially 5v of power and all the connections needed to send the data to an S/PDIF output.

Unfortunately, if the Receivers are built anything like my Sony, SDP-EP9ES, the RF Demodulator section is essentially part of the main board and trying to extricate it would be nearly impossible especially if one does not know what all the circuit traces feeding it are designed to do.

I guess if I was in your shoes and space was not a major concern, maybe I keep the receivers for a rainy day. You could use the entire receiver as an external RF Demodulator if any of the units have an S/PDIF optical or coax output (assuming these get fed w/ the proper signal from an AC3 RF source which I assume they would).

Dave
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 Post subject: Re: Salvage Demod Chips / Circuits
PostPosted: 11 Jan 2017, 12:57 
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I get that, but since I have that 70 lb monster in the main rack, that leaves 50 lb monsters sitting in the floor just to decode for the office or bedroom system.
I had never thought about them being a daughter board - possible, but I doubt it.
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 Post subject: Re: Salvage Demod Chips / Circuits
PostPosted: 12 Jan 2017, 19:47 
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Did a service manual googling - on the 09 at least there's an AC3 board with demod and decoder. Biggest issue would be dealing with the voltages, the analog parts want +/- 16v, +/- 6v, and +5v - the digital bits want +5v and +3.3v if they can be talked into working without the analog bits.

https://www.elektrotanya.com/pioneer_vs ... nload.html
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 Post subject: Re: Salvage Demod Chips / Circuits
PostPosted: 13 Jan 2017, 23:24 
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That board idea was brilliant!
I got it out, working up an insertion into a Denon 606 clone

UPDATE:
Turns out my player has a 504 power board, anyway, I only need 5 and +-15, so far.
I have a print for my board, and for the Pioneer Demod RFD-1?, and they are 98% exactly the same.
A few pins tied hi/lo vs switched, and a panel light rather than a LED.
Gonna' power up tomorrow!
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 Post subject: Re: Salvage Demod Chips / Circuits
PostPosted: 19 Jan 2017, 02:32 
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Awesome. Love to see pics later on the project.
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