Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!asuvax!noao!ncar!gatech!udel!rochester!pt.cs.cmu.edu!o.gp.cs.cmu.edu!andrew.cmu.edu!tf0z+ From: tf0z+@andrew.cmu.edu (Todd Andrew Ferrante) Newsgroups: sci.electronics Subject: Re: S L O W walkman playback, help! Message-ID: Date: 8 Feb 91 16:25:52 GMT References: <020591.153229WDBURNS%MTUS5.BITNET> Organization: Class of '92, Carnegie Mellon, Pittsburgh, PA Lines: 15 In-Reply-To: <020591.153229WDBURNS%MTUS5.BITNET> This sounds like a problem I had with my walkman (different brand). It seemed to be playing at a slower than normal speed for no particular reason. I thought it might be the fact that I was using rechargable batteries, but the problem persisted when I rigged up a 3v dc power supply from an ac adapter. I ended up opening the case and found a tiny potentiometer that was for the purpose of adjusting the motor speed. This pot is accessible through a hole in the back cover with a jewlers screwdriver so I won't need to open the case to adjust the speed again. I adjusted the speed until I thought it sounded right, but the most accurate way to do it would be to make a cassette tape recording of a 1khz sine wave from a function generator and play it in the walkman. Observe the audio output on a scope and adjust the motor speed until the output frequency matches the frequency you recorded on the tape. Todd Ferrante