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⑶束电流限制电路该电路由TDA8843的輰訛輦脚外部的VD212、V436组成,对ABL电压进行检测。TDA8843的輰輦訛脚为束电流检测输入端,当显像管过亮时,束电流也相应增大,行输出变压器T402的⑧脚电压下降,V436基极电压下降。经V436射随放大器,V436的发射极电压下降,使VD212导通,导致TDA8843的輰訛輦脚电压下降,抑制基色矩阵的输出电压,从而起到了自动亮度控制作用。
⑶ beam current limit circuit The circuit by the TDA8843 輰 false 辇 foot external VD212, V436 composition, the ABL voltage detection. TDA8843 error correction for the beam current detection input terminal, when the picture tube is too bright, the beam current also increases, the line output transformer T402 ⑧ foot voltage drop, V436 base voltage drops. The V436 emitter with the amplifier, V436 emitter voltage drops, so that VD212 conduction, resulting in false alarm TDA8843 辇 foot voltage drop, the suppression of the primary color matrix output voltage, which played a role in automatic brightness control.