Date: 2005-08-19 16:52:24
Zitat von "Baltissen, GJPAA (Ruud)" <email@example.com>: > Hallo Antitrack > > > > Very well, but how would a digital line like this replace a > > phototransistor like in the original unmodified PC drive? > > Because that phototransistor is used in exact the same way: as soon it is > lit, it pulls a line low that originally was held high to +5V through a > resistor. The way how it is used makes the circuit digital, not the fact > that a transistor can behave analogue. Just take 1541 and have a look at the > write-protect sensor of it. > > FYI: although you'll see only two connections, it is still a transistor. > Normally feeding the Base connection with current will make the transistor > conduct current. But in this case light is the trigger and therefor the Base > connection is not needed. > > With a bit of luck you can replace the phototransistor with an Hall-element. Okay. But the Hall-element has 3 lines: GND, 5V, and "Output". The phototransistor has only 2 connections, and is appearantly just "between" (?) a +5v line? (I didn't check this!) Which of these 2 connections that was heretofore reserved for the fototransistor shall I connect to which of the 3 lines of the Hall-element? > Just comes to my mind: why do you want to use a magnet again? I am the last > one to let a magnet near my floppies! What other options do I have? Yours ATT -------------------------------------- Ein Service von http://www.networld.at Message was sent through the cbm-hackers mailing list
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