Smooth turning on the kinescope filament. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Телевидение
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scheme, shown in the figure, is used for kinescopes with Un = 6,3 V and filament current In = 0,3 A, i.e. for most black and white kinescopes.
(click to enlarge)
IC DA1 is attached to a radiator with an area of \u20b\u2b~XNUMX cmXNUMX (you can use the free area of the board made of foil fiberglass).
The trimmed resistor R1 sets the required filament voltage (7 V), preferably with C3 turned off.
The voltage rise time is determined by the capacitance of the capacitor C3. In reality, the voltage rises for more than 30 seconds (the more - the slower due to leakage through R1).
Author: S. Dmitriev, Chuvashia, Morgush district, Kalaikasy.
Second device provides a smooth heating of the kinescope filament in black-and-white monitors "Electronics" MC6105 and the like. During warm-up, horizontal scanning of the monitor is blocked. After a smooth warm-up, the kinescope filament is supplied with a full voltage of 12V through the closing contacts K1.1.
(click to enlarge)
The device is assembled on a small printed circuit board and installed perpendicular to the monitor board in any free space. Relay K1 - type RES-64 RS4.569.724 or other reed relay for actuation voltage not more than 7 V and current not more than 5 mA. When replacing the relay, it is necessary to change the resistance of the resistor R5 accordingly. The device does not require adjustment.
Author: A. Daineko, Gomel region, Svetlogorsk district, Polesye village; Publication: N. Bolshakov, rf.atnn.ru
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