Xref: utzoo rec.audio:21684 sci.electronics:12211 Path: utzoo!attcan!uunet!cs.utexas.edu!tut.cis.ohio-state.edu!pt.cs.cmu.edu!abl From: abl@dart.ece.cmu.edu (Antonio Leal) Newsgroups: rec.audio,sci.electronics Subject: Re: My CD player is running slow! Message-ID: Date: 3 Jun 90 03:35:34 GMT References: <1990Jun2.182334.21396@athena.mit.edu> Organization: Carnegie Mellon University Lines: 28 In-reply-to: maddog@athena.mit.edu's message of 2 Jun 90 18:23:34 GMT In article <1990Jun2.182334.21396@athena.mit.edu> maddog@athena.mit.edu (Matthew J Marjanovic) writes: > Is it possible? > Someone gave me a supposedly broken tape player to look > at, and while I was doing comparitive studies with CD recordings > I noticed that my CD player was running just a little bit slow: > everything was just a bit flat, and a good tape player would > perceptibly overtake the CD in about ten seconds. Have you considered the possibility that the tape player(s) may be running fast ? It's kind of hard to make quartz-oscillator digital circuits run slow (i.e. all the servo controls and digital-to-analog conversion in the CD), while it's very easy to have an analog controlled motor and belt system with all analog front end (i.e. the tape player) be a bit off. Then again, maybe the quartz oscillator _is_ out of whack, but I doubt it. Usually they are spec'd to a few p.p.m. (parts per million) precision, and if the capacitors in the circuit around the quartz go bad, it just does not run. Check it CD against CD, and tell us, huh ? Or just check the time elapsed count against a watch. -- Antonio B. Leal Dept. of Electrical and Computer Engineering Bell: [412] 268-2937 Carnegie Mellon University Net: abl@maxwell.ece.cmu.edu Pittsburgh, PA. 15213 U.S.A.