A couple weeks ago, I posted something about a tiny, stereo, preamp that could possibly be used an interface between the laptop computer's earphone out and the PSR-3000's auxiliary input, something to boost the inadequate power of the keyboard's input. The preamp I found was very compact, about half the size of a package of cigarrettes and in kit form sells for $12.99 U.S.--dirt cheap. According to the specifications, it provided a 50X signal boost to tiny signals so they could be sent to a power amp.

After spending 3 hours with a soldering iron assembling the preamp on its tiny printed circuit board, something I have not done in more than 40 years, the completed project was hooked up to a power supply and plugged into the appropriate systems.

The bottom line is it is too powerful. I had to turn everything down to it's lowest level to prevent distortion, and even then it was still too much. It works just fine for amplifying a phonograph turn-table pickup, or even the tiny signal emmited from a tape recorder's playing heads, but from the laptop it's just too much. And, there were no adjustments to lower the amplitude. Oh well, back to the drawing board.

BTW: I'll happily sell it to anyone that wants it for $20. Keep in mind, it's a raw printed circuit system that is not in any type of case.

Cheers,

Gary