On 12-11-28 02:59 PM, threeneurons wrote:
Here's the checker schematic.
<http://threeneurons.files.wordpress.com/2012/11/crt_tstr.gif>
It uses 2 MC34063 chips. One for the HV, and the other for the 6V
heater. 10 signals go to the CRT tube.
A lot of the old scope circuits used to run the cathode at a negative
voltage. (this required a well insulated filament transformer.) but
meant that the defection plates were almost at ground potential. One
could create a test signal that would draw an pattern on the screen.
--
Charles MacDonald Stittsville Ontario
[email protected] Just Beyond the Fringe
http://Charles.MacDonald.org/tubes
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