George wrote:
"Grunff" wrote in message
...
The Natural Philosopher wrote:

Optical sensor.
Nah, that's way too generic - it could mean an ldr, a photo diode, a
reflectance proximity switch, or a slotted opto switch. It's a slotted
opto switch.


--
Grunff

Other items U can find them on are...

Floppy drive
Tape data drives

Thang is are they all a common voltage?



Pretty much, as they comprise an infra-red led and an opto transistor.
Forward drive current for the led varies and peak reverse voltage and
max forward current for the transistor vaies, but as I say, they are all
much of a muchness.

You can find them in the opto-electronics section of any supplier,
including RS, Farnell, CPC, Rapid, etc. Couldn't find them in Maplin,
though.