Tim Hughes said:
...why don't you just get a phototransistor from Radio Shack?
They used to sell a generic part similar to the popular FT100 device.
Most
ham outlets,surplus stores and even say Fry's Electronics in CA also
sell
photo-transistors or photo imnterupters (an LED/Phototransistor pair in
a
slotted package you could split into two.)
----------------------------------------------------
Tried Radio Shack about 6 months ago but all I could get in the store or
the normal catalog were infrared devices. Went to a small, local
electronics store and bought two different types. One had a wide field,
the other was narrow. I started building with the wide field but I
think it introduces errors at high shutter speeds. I never seemed to
get any closer to the expected result than a few milliseconds. Makes it
tough to measure 1/125 or faster. I'm (eventually) going to retry with
the narrow field. I also think one needs a DC light source. In some
earlier attempts I think my measurements were picking up 60Hz noise from
the AC line. Don't really know what I'm doing so have to live and
learn.
Chuck Norcutt
Woburn, Massachusetts, USA
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