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Floppy Conversion Part 2
Join pins 12 to 11 and 16 to 15 in the IDE connector…the power goes
in the right hand side connector though the 5volt input
We can see the 2 pins bent here and easy 4 or 5volt input
Cheat the floppy insert sensors to make it think there is a floppy
inserted
(you can stick them in with tape …or remove from PCB and put little
shorts in
Ok, here we are running a old LINN inner platter /LINN belt… and
almost the same pulley size as LP12….
the unit also has a variable resistor fitted (MORE ON THIS IN A
MIN)…
and this is currently working our test bed model
I found this 800ohm resistor inline to the motor controller…
(by jumpering each resistor with a 1000ohm resistor to see if any
speed change was possible)
Each floppy will be different…so if you want to try varying the
speed you will need spend a few minutes checking
The basic floppy works fine without all
this if you have a 2-size pulley for 33 and 45 rpm
I have piggy backed the variable resistor over the original resistor
(as a safety net) to test with at 1st
So 2 choices vary speed with 1 pulley size
And single standard speed with 2 pulley sizes
The motor noise varies with speed selected …at standard speed its
very quiet….so that’s worth the hassle of 2 speed pulley….on the
other hand vary speed offers speeds of 16/33/45/78 rpm…maybe a
little nosier …but ill work on that for part 3
Also coming next…we will rubber mount the motor, make new pulleys,
cut PCB smaller and compare sound of single speed and vary speed
motors
PART 3
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