Integratable CRT spot cut-off network

Details Integratable CRT spot cut-off network Integratable CRT spot cut-off network

1981-02-27

1983-06-28

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315381, 358220, H01J 2970, H01J 2972

Patent

active

043908179

ABSTRACT:
An integratable CRT spot cut-off network is described for use in a television receiver. The network establishes a reference current for biasing up the receiver's G.sub.1 grid when the supply voltage comes up, and a bypass capacitor coupled to the grid charges toward the supply voltage. When the receiver is turned off, the network terminates the reference current as the supply voltage starts to collapse and prevents the bypass capacitor from discharging. The charge stored on the capacitor reverse biases the grid to cut off the receiver's beam current.

REFERENCES:
patent: 4056758 (1977-11-01), Schaas

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