22 May
2012
22 May
'12
12:02 p.m.
Hi, from an old reader, I have the sensor assembly. It
has 13 LEDs and
photo diodes, arranged in 2 groups of 6, spaced 2.8mm, on both sides of
a central set for the index hole. The latter is appx. 1mm out of line.
The unit is 2" high x 2.26" wide, with a 0.06" slot for the tape.
Output is through 2 74LS240 (Octal tri-state inverting buffers) and
7" of 26 conductor ribbon cable. Weihing only 77g, I'll send it free,
postage paid, to the first guy asking for it.
THis sounds like the read head for typesetter tape (which had offset
sprocket holes) and amy not be much use for reading computer/telegraph tape.
-tony