I'm trying to find a modern CDS cells to replace these old timers (1982)
from the 70s, I did find a catalogue page for these CDS cells, but the details are not as useful to me as perhaps they would be to someone
handy with using CDS cells.
The ratings are:
VT212L - 6 R1, 5 R2
VT212 - 7.8 R1, 5 R2
R1 defined as 2fc resistance in K Ohms (tolerance +/- 33.3% @ 2850K Source
R2 defined as min dark resistance (Megohms) in 5 sec.
Having a heck of a time matching these to more modern cds such as
carried by DK or Mouser. I tried the NSL-06S53, but its light resistance
is too sensitive and nothing else on DK was better.
Anyone have a VACTEK catalogue who could scan the pages that might help?
I suspect that PerkinElmer bought out Vactek as they used similar part (VT200x) numbers as early as 2001 that I could find on web.archive.org,
but that archive doesn't have the parts books captured.
Bitsavers doesn't list it, nothing on ebay either...
Why am I bothering? I have a rifle gallery
(http://www.bonanzagallery.com/) that uses flash tubes in the rifles to
trip the cds cells in the targets and there are around 70 cds cells. A
number of them are failing so I want to replace them with something that
will work reliably.
Thanks as always for your time!
John :-#)#
I'm trying to find a modern CDS cells to replace these old timers (1982)
from the 70s, I did find a catalogue page for these CDS cells, but the details are not as useful to me as perhaps they would be to someone
handy with using CDS cells.
The ratings are:
VT212L - 6 R1, 5 R2
VT212 - 7.8 R1, 5 R2
R1 defined as 2fc resistance in K Ohms (tolerance +/- 33.3% @ 2850K Source
R2 defined as min dark resistance (Megohms) in 5 sec.
Having a heck of a time matching these to more modern cds such as
carried by DK or Mouser. I tried the NSL-06S53, but its light resistance
is too sensitive and nothing else on DK was better.
Anyone have a VACTEK catalogue who could scan the pages that might help?
I suspect that PerkinElmer bought out Vactek as they used similar part (VT200x) numbers as early as 2001 that I could find on web.archive.org,
but that archive doesn't have the parts books captured.
Bitsavers doesn't list it, nothing on ebay either...
Why am I bothering? I have a rifle gallery
(http://www.bonanzagallery.com/) that uses flash tubes in the rifles to
trip the cds cells in the targets and there are around 70 cds cells. A
number of them are failing so I want to replace them with something that
will work reliably.
Thanks as always for your time!
John :-#)#
0.5Meg dark resistance, 25 deg C7.8kOhm at 2 ft-c T 2850K
On 2024-09-09 9:33 p.m., Chris Jones wrote:
On 29/08/2024 10:19 am, John Robertson wrote:Thanks!
I'm trying to find a modern CDS cells to replace these old timers
(1982) from the 70s, I did find a catalogue page for these CDS cells,
but the details are not as useful to me as perhaps they would be to
someone handy with using CDS cells.
The ratings are:
VT212L - 6 R1, 5 R2
VT212 - 7.8 R1, 5 R2
R1 defined as 2fc resistance in K Ohms (tolerance +/- 33.3% @ 2850K
Source
R2 defined as min dark resistance (Megohms) in 5 sec.
Having a heck of a time matching these to more modern cds such as
carried by DK or Mouser. I tried the NSL-06S53, but its light
resistance is too sensitive and nothing else on DK was better.
Anyone have a VACTEK catalogue who could scan the pages that might help? >>>
I suspect that PerkinElmer bought out Vactek as they used similar
part (VT200x) numbers as early as 2001 that I could find on
web.archive.org, but that archive doesn't have the parts books captured. >>>
Bitsavers doesn't list it, nothing on ebay either...
Why am I bothering? I have a rifle gallery (http://
www.bonanzagallery.com/) that uses flash tubes in the rifles to trip
the cds cells in the targets and there are around 70 cds cells. A
number of them are failing so I want to replace them with something
that will work reliably.
Thanks as always for your time!
John :-#)#
Did you see ths document?:
https://www.worldradiohistory.com/Archive-Tele-Tech/60s/Electronic-
Industries-1965-07.pdf
Page 84/85 of the pdf, or page 82/83 printed on the original.
It says
Type VT212
CdSe material
0.62 - 0.86 micron spectral limits (10% points)
0.74 micron peak sensitivity
0.21 inch diameter
0.146 inch depth
;0.5Meg dark resistance, 25 deg C7.8kOhm at 2 ft-c T 2850K
50mW dissipation
70 Volt rating
at 0.1 ft-c resistance is 67% of room temperature resistance at 65 deg C
6ms rise time, 5ms decay time at 10 ft-c
John :-#)#
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