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Police light ne5559/23/2023 ![]() ![]() The output of timer NE555 drives piezo-buzzers (PZ1 and PZ2), which can be switched on and off using switches S3 and S4, respectively. Frequency F is obtained at output pin 3 of IC2 as per the following relationship: Oscillation frequency of timer NE555 is set with R3, R4, potmeter VR1 and capacitor C6. ![]() Piezo-buzzers PZ1 and PZ2 should be used with internal oscillator and should be operational at the selected power supply. The resistors in series with all LEDs should have appropriate values depending on the power supply voltage and the type of LEDs. Alternatively, you can use a 6V-15V DC or 6V rechargeable battery after slight modification in the circuit. The circuit works off a 9V regulated power supply derived from transformer X1, bridge rectifier BR1 and regulator 7809. 1: Circuit diagram of AC lamp blinker using timer NE555 Power supply It is built around a step-down transformer (X1), 9V voltage regulator 7809 (IC1), timer NE555 (IC2), two MOC3043 optoisolators (IC3 and IC4), two BTA06 triacs (Triac1 and Triac2), two 1N4007 diodes (D1 and D2), six LEDs (LED1 through LED6), two piezo-buzzers (PZ1, PZ2), two 230V AC, 60W bulbs (Load1 and Load2), and a few other components. Circuit and workingĬircuit diagram of the AC lamp blinker is shown in Fig. It can be varied using 100-kilo-ohm potmeter VR1. The switching frequency is selected according to the resistor and capacitor components connected to NE555.
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