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Amplifiers for home audio systems.

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Adding an external audio input to this excellent boombox

The JVC RC-X610 boombox, like a lot of JVC audio equipment, is surprisingly good but it lacks an external audio input.

Even for an experienced electronic engineer the PCB's are undecipherable without a service manual and schematic.

I have found an very expensive copy of the service manual on eBay. Where do these sellers find their manuals I wonder?

Can anybody point me to a repository of JVC service manuals or specifically, one for the JVC RC-X610 ?

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I mean if you are not willing to throw down $13 for the schemo then time must not be a big concern, so just start digging in. I've found it pretty easy to find the place to tap into for a line in. That place usually is the fm output buffer stage. Find the main fm chip, look up the datasheet, find its L/R stereo out and tap in after the output buffer, but before the main selector switch or preamp. Then place your own dpdt switch there, that way you then select between Fm or line in. Its pretty much the only way I've found without building extra circuits. Good luck.

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I use the line in at the back of the unit. If you push play on Tape A (with no tape present) then the incoming audio is mixed with the tape output (hiss). Adjusting the level of the input device can moderate the level of audible hiss. This is not for audiophiles, just something I discovered accidentally.

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