SU642751A1 - Sound monitor of motor vehicle turn indicator operation - Google Patents

Description

Horo oscillator, diodes 9, 10, resistors P - 16, of which resistor 3 is a discharge, zener diode 17 and telephone cap 18, transistor 19 and diode 20.

The device works as follows.

When the voltage is turned on and the switch is turned off, the voltage on the storage capacitor} is zero, the switched transistor 2 is closed, the time setting for the xa sensor 3 is charged before the supply voltage, the field effect transistor 4 is open, the transistor 5 of the threshold trigger is open, the transistor 5 b is closed. The tonal oscillator on transistors 7 and 8 does not work, because no supply voltage is applied to its emitter circuit.

When the direction indicators are turned on, the control lamp and the input of the circuit connected to it begin to receive voltage pulses, the first of which through diode 9 quickly charges storage capacitor 1 and opens the key transistor 2. Charged time sets the capacitor 3 through an open junction the collector - emitter of the key transistor 2 is connected with the plus to the negative wire of the power source I, and the minus to the gate of the field-effect transistor 4, locking it. The threshold trigger switches to the state in which the transistor 5 is closed, and the transistor 6 is open. With an open transceiver b, the sum of the voltages on the non- and resistor 14 is less than the stabilizer-stabilization of the zener diode 17, therefore the collector of transistor 7 and the base of transistor 8 of the tone generator are disconnected from the minus of the power source and 8 through diode Ш and a resistor, the tone generator does not work.

In the intervals between the pulses, the diode 9 is locked and the storage capacitor I is discharged through resistor 12 and the base – emigger circuit to the night transistor 2, maintaining its 2 open states.

From the moment the key transistor 2 is opened, the time snagging capacitor 3 begins to discharge through the collector-emitter circuit of the key transistor 2 to the discharge resistor 13. For a time, the drive capacitor 3 decreases and after some time becomes equal to the cut-off level of the current of the voltage transistor 4 and then less of it. The current through the field effect transistor 4 begins to increase, creating an increasing voltage drop across resistor 15, which acts on

Threshold Trigger Entry. When this voltage exceeds the switching threshold, the trigger switches to the state in which transistor 5 is open and transistor 6 is closed. The collector of the transistor 7 and the base of the transistor 8 through the Zener diode 17 and the resistor 16 are connected to the minus of the power source, and the tone generator begins to operate in time with the arrival of voltage pulses at the input of the circuit.

When the turn indicators are turned off, the tone generator stops working, the storage capacitor 1 is discharged through resistor 12 and the base-emitter circuit of the key transistor 2, which closes, providing a fast charge time of the driving capacitor 3 through resistor 19 and diode 20, after which the circuit returns to its original state condition.

Similarly, the circuit returns to its original state even if the turn signals were turned off before the start of the audio signal.

Claims (2)

1. Technical description of the US-K alarm indicator 2. Signal “Signal. Technical description. Caen / r. / lama -about