Remote switching of television programs. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Remote switching of television programs. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Телевидение

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This device will be a useful addition to a TV that does not have a remote control. It does not require batteries, as is the case in IR remote controls, and is much cheaper and simpler, which makes it possible to manufacture and connect it even to people inexperienced in radio electronics.

The device can be used in ZUSCT TV models (for example, RUBIN Ts231, Ts281, etc.) with pseudo-sensor program selection blocks such as SVP-4-5, SVP-4-6, SVP-4-7. The device diagram (Fig. 1.2) allows you to sequentially (in a circle) switch television programs with a single button.

The electrical circuit consists of a pulse shaper on D1.1 (after pressing and releasing the button S1, which eliminates the effect of contact bounce), a pulse repeater D1.2 and a switch on the transistor VT1. Capacitor C1 allows you to get rid of pickups along long connecting wires (up to 10 meters) from the button to the circuit. The connection with the button is best done with wires twisted together. Chip D1 can be replaced by 1561TM2 or 564TM2. Any transistor with a similar conductivity is suitable, for example, KT312, KT3102, KT3117. Capacitors C1 and C2 are better to use not electrolytic, but any other type. As a diode VD1, you can use diodes of the type D2, D9 or any pulse.

Rice. 1.2 (click to enlarge)

The circuit is located inside the TV near the program switching unit. It is convenient to solder three connecting wires directly to the pins of the 155IE9 microcircuit. If the connecting wires from the circuit to the button are longer than 10 meters, then in order to increase the noise immunity of the device, it is useful to connect the power circuit of the circuit (2) not to the output 16 of the microcircuit, but to the +12 V circuit on the board.

With proper assembly and serviceable parts, the tuning scheme does not require and will reliably serve you for many years.

Publication: cxem.net

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