Turn signal relay. Scheme, description

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Turn signal relay. 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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The direction indicator relay is capable of operating from 12 and 6 V current sources (suitable for installation on many motorcycle models). The frequency of switching on lamps and sound signals is 1 s.

The schematic diagram of the device is shown in the figure.

Turn signal relay

A master oscillator operating at an audio frequency of 1 kHz is assembled on a DD512 chip of the KR10PS1 type. From the output Q1 of the MS counter, rectangular pulses with a frequency of 1 Hz are fed to the input of a key current amplifier based on transistors VT1-VT4. The base of the transistor VT1 also receives (through the resistor R2) pulses with a frequency of 1 kHz from the master oscillator. The parametric stabilizer VD1R3 serves to power DD1 with a stable voltage. The key current amplifier is powered by unstabilized on-board voltage.

The total current consumption of the device with the signal lamps off does not exceed 7 mA, so there is no power switch in the relay.

After turning on the direction indicator (switch SA1 to the position, for example, "P" - turn to the right), the composite transistor VT3VT4 begins to open periodically, entering saturation. The time during which it is saturated is 0,5 s. The next 0,5 s transistor with a frequency of 1 kHz, it switches from active to closed state.The voltage shape on the signal lamps is shown in the figure (for the voltage of the on-board network Ubc=6V).

Turn signal relay

During the half-cycle, the voltage on the lamps HL3, HL4 (Ul) is constant and equal to 5,5 V, so they shine with full heat. During the second half-cycle, the voltage Ul (a sequence of short pulses with a frequency of 1 kHz) of the lamp practically does not shine, although their filaments remain hot. In this case, the voltage drop across the lamps HL3, HL4 is transmitted through the diode VD2 to the sound emitter HA1, which reproduces a sound signal with a frequency of 1 kHz. With an on-board network with a voltage of 12 V, the resistor R3 should be replaced with another one (1,5 kOhm in a power of 1 W).

You can reduce the volume of the signal by connecting a resistor with a resistance of 1 ... 51 Ohms in series with HA82. You can use resistors of types MT, OMLT, S2-ZZA with a power of at least 0,25 W. Capacitor C1 - KLS, KM or K10-17. Transistors KT315V can be replaced with KG312A, KT608A, KT603A; KT313B - on KT630G; GT806A - on GT701A. Instead of a composite transistor (VT3-VT4), you can use KT825A or KT825B, and instead of KD102B diodes, any others with a forward current of at least 0,3.

A telephone capsule with a resistance of at least 50 ohms is suitable as a sound emitter. The SA1 switch is a P2T-14 toggle switch or any other with a middle position and a permissible current through the contacts of at least 4 A. All parts of the direction indicator relay, except for the toggle switch and capsule, are mounted on a printed circuit board made of foil fiberglass 1,5 mm thick. Transistor VT4 should be installed on a massive heat sink attached to the board. The board and capsule are placed in a box made of sheet duralumin, which is mounted in a place convenient for the driver. With proper installation and serviceable parts, the relay does not need to be adjusted.

If there is an alternating voltage in the on-board network, the key current amplifier should be powered through a rectifier, and the microcircuit should be powered from three galvanic cells 316, 343, 373 or from a battery 3336. In this case, there is no need for a parametric stabilizer.

For more stable operation of the transistor VT4, its emitter junction should be shunted with a resistor with a resistance of 200 ... 300 Ohm with a power of 1 W.

See other articles Section Automobile. Electronic devices.

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