555 simple color TV additional remote control circuit

Published:2011/6/15 22:07:00 Author:TaoXi | Keyword: 555, simple, color TV, additional remote control | From:SeekIC

The color TV additional circuit is as shown in figure 14-16. The astable multivibrator is composed of the 555 and R2, RP, C2, the oscillation frequency is decided by the RP, R2, C2. The receiving circuit is composed of the amplifier circuit, the rectifier circuit and the counting circuit, the CD4017 is a decimal count / pulse distributor integrated circuit. When the CD4017 receives the control signal, the Q0～Q7 successively outputs the high level to control the conduction and cut-off of the VT4～VT11 transistors, and it also controls the on-off of the color TV's primary switch. In figure (b), the collector electrodes of VT4～VT11 are connected with the 1-8 connection points of the manual control preliminary selection button, such as the point A of figure (c).



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