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Safety Guard(CD4060)

2017-08-09 07:47  
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This article describes the Safety Guard (CD4060). The principle is very simple, very practical. The circuit components can help you understand better grasp this principle. For example, in this circuit, you can go to find and buy these components: CD4060.

Protect your home appliances from voltage spikes with this simple time delay circuit. Whenever power to the appliances is switched on or resumes after mains failure, the oscillator starts oscillating and D5 blinks. This continues for three minutes. After that, Q14 output of IC CD4060 goes high to trigger the gate of theSCRthrough D4. At this moment, the voltage is available at the cathode of theSCR, which energizes the relay coil to activate the appliance and D6 glows. Switch SW1 is used for quick start without waiting for delay.

Circuit diagram:

Figure:1 Safety Guard Circuit Diagram

Figure 1 Safety Guard Circuit Diagram

Parts

R1 = 1M
R2 = 470R
R3 = 820R
R4 = 56K
R5 = 470R
R6 = 1K
R7 = 10K
C1 = 1kuF-25V
C2 = 100nF-63V
C3 = 0.02uF-63V
C4 = 10uF-25V
C5 = 10uF-25V
D1 = 1N4007
D2 = 1N4007
D3 = 1N4007
D4 = 1N4148
D5 = RedLEDs
D6 = RedLEDs
RL1 = 12V Relay
IC1 = AN7809
IC2 = CD4060
SW1 = Switch
T1 = 24V-AC Centre Tapped Transformer

Circuit Operation

At the heart of the circuit is IC CD4060, which consists of two inverter gates for clock generation and a 14-bit binary ripple counter. Here the clock oscillations are governed by resistor R1 and capacitor C1. In this circuit, only two outputs of the IC (Q5 and Q14) have been used. Q5 is connected to anLED(D5) and Q14 is used to trigger the gate of theSCRthrough D4 as well as reset the counter. The anode of theSCRis connected to 9V and the cathode is connected to the relay coil. The other pin of the relay coil is connected to the negative supply, while its contacts are used for switching on the appliances.

 

 


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