" bravely wrote to "All" (19 Dec 05 07:25:41)
--- on the heady topic of " Unusual functions of cheap parts"

mr From:
mr Xref: core-easynews de.sci.electronics:311430
mr rec.radio.amateur.homebrew:89926 sci.electronics.components:104476
mr sci.electronics.design:532313


mr In sci.electronics.components Winfield Hill
mr wrote: Rolf_B wrote...
[1N4007] are available with a SOD-57 glass envelope, too (1N4007G?).
These are fairly well photoconductive.

While many companies* are making 1n4007G glass-passivated diodes,
it appears they all cover the glass with plastic. I wonder...
where one can get a 1n4007 with an all-glass package these days?

mr I've got a few 1N4003 and 1N4004 diodes with all-glass packages but
mr I'm not sure how recent they are. They have the (older?) Fairchild
mr logo of an italicized "F" with the middle stroke extending on both
mr sides of the vertical. I'm about 90% sure these came in one of those
mr "20 rectifiers for $2" packages from Rat Shock, so who knows how old
mr they really are. The bodies are about 2.5 mm diameter by 4 mm long.
mr Inside the glass, the ends near the leads are orange, with a clear
mr strip less than 0.5 mm wide near the middle.

mr Testing them with the "diode check" on a $40 multimeter and either a
mr 40 watt clear globe lamp or a TV remote control doesn't show much
mr photoconductivity, but I suspect I would need to look a little harder
mr than this to see it.

mr Matt Roberds


Germanium diodes like a 1N34 in glass case are quite light sensitive.
Some LED's are too and IR emitter LED's are quite sensitive to IR.

A*s*i*m*o*v