🚀 go-pugleaf

In article <1993Jan2.104609.4196@arizona.edu> dparker@ece.arizona.edu (Douglas R. Parker) writes:
>
>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
>
Most likely, it was a Hall-effect device used to sense end-of-tape. When you 
reach an end-of-tape situation (in play, rewind, or Fast-forward), the hub is 
stopped by the tape-tension, the magnet no longer passes by the device, and 
the periodic signal ceases to be induced. 

This signal is also used for the digital tape-counter (if your deck has one). 
Some decks use an optical device and a wheel with reflective patterns.

Hope this helps (or is even correct),
George Larson             |
george@alpha.ee.ufl.edu   |           "Remember, we're all in this together!"
University of Florida     |             -Harry Tuttle ("Brazil")