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4hv.org :: Forums :: General Science and Electronics
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camcorder viewfinder Qs

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Myke
Mon Mar 05 2007, 09:26PM Print
Myke Registered Member #540 Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969
Hi there, does any body know at what voltage does the camcorder viewfinder's anode, grid 1, cathode, and grid 2 operate at?
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Wolfram
Tue Mar 06 2007, 09:17AM
Wolfram Registered Member #33 Joined: Sat Feb 04 2006, 01:31PM
Location: Norway
Posts: 971
Unless you're trying to operate the tube directly, that shouldn't be a concern. The small board that usually sits beside the tube provides all the neccessary voltages. This board usually needs 5V.
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Myke
Tue Mar 06 2007, 02:24PM
Myke Registered Member #540 Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969
There are many pins and I tried to figure what is gnd, vcc and sig but I can't tell. I'll try again. K so I think I found vcc and I found gnd but there are 2 other pins. one is data or sig and the other maybe a sync pulse but I can't tell the differance?
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Wolfram
Tue Mar 06 2007, 03:39PM
Wolfram Registered Member #33 Joined: Sat Feb 04 2006, 01:31PM
Location: Norway
Posts: 971
GND is easy to find, because it is connected to the - terminal of many of the large electrolytics on the board. VCC is not much harder, as it usually is connected to an inductor, then to a big electrolytic near the connector. Measure for continuity between the connector pins and the + terminal of big electrolytics near the connector. The video signal input is best found by experimentation, power it up (usually 5V) and then apply a 1vPP composite video signal to the leftover pins.
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