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Registered Member #3925
Joined: Fri Jun 03 2011, 10:50AM
Location:
Posts: 121
hey,
i have the tiny viewfinder crt from an old camcorder, but i dont have the driver circuit board, i wanna make it into an oscilloscope - what voltage does it use for its heater, and anode? the heater is not 6.3v, it is below 1v i think,
the crt has 6 pins, plus 4 wires for the deflection coils, any ideas as to what those pins are for? me thinks the heater is the cathode so 2 wires for that, and 4 anodes?
im scared ill burn out the heater, by running it too hot :(
Registered Member #3093
Joined: Mon Aug 09 2010, 11:40PM
Location:
Posts: 68
I think the heater on all my viewfinders works at 0.6 volts, and the pins are usually heaters accelerating/focussing anodes and a control grid. the one pin that is all by itself connects to the flyback.
Registered Member #3925
Joined: Fri Jun 03 2011, 10:50AM
Location:
Posts: 121
william L wrote ...
I think the heater on all my viewfinders works at 0.6 volts, and the pins are usually heaters accelerating/focussing anodes and a control grid. the one pin that is all by itself connects to the flyback.
thaanks, mine is a sony one, like this , any idea what the anode voltage is? and, is there a seperate cathode, or is the heater the cathode? it was showing a dot earlier when i was running it at 2.5v O.o , but now its at 860v, and not even a faint dot, is this voltage too low?
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
I believe that the focus and screen voltages depend on model but aren't much more than 200V at a microamp. A simple voltage divider will work here, people have used series connected 150v zeners to get this spot on See and Also try this with an old camcorder LCD maybe? PM me and I will see how much the postage is if you want to give this unit a try.
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camcorder viewfinder crt oscilloscope
