Direction indicator relay based on load switch. Scheme, description

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Direction indicator relay based on load switch. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Automobile. Electronic devices

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Of course, vehicles that are not equipped with a direction indicator are becoming less and less on the roads every day. And this topic has practically ceased to be relevant. However, due to the fact that factory electronic indicator relays still often fail, the hassle and losses associated with the acquisition of a new unit remain. This means that radio amateurs still have something to apply their ingenuity and hands to.

A. Kozhurov's article "Load switch" ("Radio", 1991, No. 7, pp. 37-39) describes a non-contact low-voltage current interrupter. The design is simple and, it seems to me, very promising; its author, apparently, deliberately did not give practical recommendations on the use of this device, counting on the creative approach of radio amateurs.

I bring to the attention of readers two options for the turn indicator relay, developed on the basis of a load switch. On fig. 1 shows a diagram of a relay designed to operate in an onboard DC network. It will completely replace the traditional thermal relay without any circuit changes in the electrical equipment of the car.

Turn signal relay based on load switch

On the logical elements DD1.1, DD1.2, an interrupt frequency generator is assembled. Elements DD1.3 and DD1.4 are buffer generator signal inverters. Transistors VT1, VT2 of the current amplifier are connected in parallel. A powerful transistor VT3 is a current interrupter for signal lamps (the diagram shows lamps HL1 and HL2, symbolizing two groups of lamps on the left and right sides of the side).

All transistors operate in switching mode. Diode VD1 prevents the failure of the DD1 microcircuit in the event of an emergency reversal of the polarity of the relay connection to the on-board network; it must be germanium.

For those who are interested in the details of the load switch, I recommend reading the above article.

For a vehicle with an on-board AC network, a turn indicator relay assembled according to the diagram in fig. 2. It differs from the previous one in that it is powered by a diode rectifier VD1-VD4, and in that the current breaker is assembled on a composite transistor VT1, VT2, R2.

Turn signal relay based on load switch

Modern turn signal systems provide an additional emergency stop signaling mode, when both sides of the bead lamps flash simultaneously. We hope that readers will be able to independently modify the described relays to implement this mode.

Author: I.Chernoplechiy, Kaduy village, Vologda region

See other articles Section Automobile. Electronic devices.

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