Relay turn signal indicators are able to work from current sources voltage 12 and 6 In (suitable for installation on many models of motorcycles). The frequency activate the lights and sound signals 1 s.
Schematic diagram of the device shown in the figure.
On DD1 chip type CRES assembled a master oscillator operating at audio 1 kHz. From the output Q1 of the counter MSEC rectangular pulses with a frequency 1 Hz is input to the key of the current amplifier transistors VT1-VT4. The base transistor VT1 is also coming in (through resistor R2) pulses with a frequency of 1 kHz with the master oscillator. Parametric stabilizer VD1R3 is used to supply DD1 stable voltage. Key current amplifier is powered unstabilized on-Board voltage.
The total consumption of the device current at off signal lamps not more than 7 mA, so the power switch in the relay is not.
After turning on the pointer turns (switch SA1 in position, for example, “P" -turn to the right) composite transistor VT3VT4 starts intermittently open, going into saturation. The time during which it is saturated, equal to 0.5 C. Next, 0.5 sec transistor with a frequency of 1 kHz is transitioning from the active state in closed. The shape of the voltage signal lamps shown (for the Board voltage CHD=6B).
During the half cycle the voltage at the bulbs HL3, HL4 (Il) is equal to 5.5 In, so they Shine at full intensity. During the second half cycle voltage Il (a sequence of short pulses with a frequency of 1 kHz) lamp virtually no Shine, although their thread and stay hot. The decline the voltage at the bulbs HL3, HL4 is passed through the diode VD2 on the sound projector HA1, which reproduces the audio signal frequency of 1 kHz. When the on-Board network with 12 V resistor R3 should be replaced by another (1.5 kW in capacity of 1 W).
To lower the volume of the enable signal can be connected in series with HA1 of resistor 51…82 Ohms. You can apply resistors types MT, OMLT, C2-SSA capacity of not less than 0.25 watts. Capacitor C1 - KLS, km or K10-17. Transistors CTV can be replaced by CGA, CTA, CTA; CTB - CTG; GTA - GTA. Instead of composite transistor (VT3-VT4) can be used CTA or CTB, and instead of diodes KD102B-any other direct current of at least 0,3.
As a sound projector will fit a Cup with resistance not less than 50 Ohms. The switch SA1 - tumbler P2T-14 or any other middle position and the allowable current through the contacts of at least 4 A. All the details of the relay the pointer turns, except for the toggle switch and the capsule, mounted on a printed circuit Board from foiled fiberglass 1.5 mm thick. Transistor VT4 should set on a massive heat sink, attached to the Board. Charge and primer placed in a box made of sheet duralumin, which is attached in a convenient the driver's place. With proper installation and working parts of the relay to establish not need.
If the on-Board network voltage, key current amplifier should feed through a rectifier, and a chip - three galvanic cells 316, 343, 373 or battery power 3336. The need for parametric the stabilizer disappears.
For more stable operation of the transistor VT4 should emitter junction shall be shorted by a resistor of 200…300 Ohm 1 watt.