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- Newsgroups: sci.electronics
- Path: sparky!uunet!wupost!zaphod.mps.ohio-state.edu!pacific.mps.ohio-state.edu!linac!att!princeton!ernie.Princeton.EDU!ajackson
- From: ajackson@ernie.Princeton.EDU (Andrew William Jackson)
- Subject: Re: Magnetic Sensor?
- Message-ID: <1993Jan11.052513.10885@Princeton.EDU>
- Originator: news@nimaster
- Sender: news@Princeton.EDU (USENET News System)
- Nntp-Posting-Host: ernie.princeton.edu
- Organization: Princeton University
- References: <1993Jan2.104609.4196@arizona.edu>
- Distribution: world,local
- Date: Mon, 11 Jan 1993 05:25:13 GMT
- Lines: 26
-
- In article <1993Jan2.104609.4196@arizona.edu> dparker@ece.arizona.edu (Douglas R. Parker) writes:
- >Greetings.
- >
- >Quite a while back I attempted to repair the tape deck
- >in my Toyota. I found that one of the plastic shafts that
- >rotates the casette's tape wheel had cracked, leaving a gap
- >in the gear teeth. I assume the reason for malfunction and
- >subsequent devouring of many a tape was a perpetual End of
- >Tape being recieved. I tried using similar salvage parts to
- >replace the gear but this didn't work. The reason for this,
- >I think, is that the original gear had a small disk magnet
- >fixed to its base, and beneath it was a small surface mount
- >component. I assume this is some sort of a tape speed
- >regulation. My question? The matter is rather academic at this
- >point, as this was a good excuse to buy a CD unit. However,
- >I am still very curious as to how the thing worked. Although
- >my EMAG is rusty, I would guess that a rotating B field was
- >somehow used to induce current in this sensor, which was
- >then used as a feedback. Does anyone out there have experience
- >with this type of arrangement?
- >Just extremely curious,
- >
-
- more likely a hall effect sensor.
-
-
-