Analog Micro Cassettes

I now have a box of MC-60 cassette tapes. I also have the portable voice recorder that was used to record them.  This is way old technology but I also have a cable that can plug from the Earphone jack to the Microphone jack on the laptop thus converting the analog to digital.  Not quite. The box came with one of those dodgy variable power supplies. I checked the voltage required for the recorder which was 3V. The power supply was already on 3V so I plugged it in and immediately I could tell I had just fried the recorder. Do not ever use this type of power supply! 
Two days later and I have located another antique voice recorder from Cash Converters (thanks to Debbie dearest who suggested they may have something), which I have purchased for $19. This one is intermittent but if you shake it, it will play the tape. My latest laptop does not have a Mic jack input but the docking station does. However after  three hours of  trying it seems there is a configuration issue which results in a file with no sound.  I then tried an old laptop which does have a Mic Jack and voila I now have a wma sound file of Jack Roberts describing his various exploits. This was recorded in 1992.

Power supply not supplied