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Safety Guard by CD4060

Simple unit, Protects home appliances from voltage spikes
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 the SCR through D4. At this moment, the voltage is available at the cathode of the SCR, which energizes the relay coil to activate the appliance and D6 glows. Switch SW1 is used for quick start without waiting for delay.

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 an LED (D5) and Q14 is used to trigger the gate of the SCR through D4 as well as reset the counter. The anode of the SCR is 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.
Source : electronicsforu.com

Be the first to comment - What do you think? Posted by admin - March 6, 2011 at 10:49 pm

Categories: Alarm systems, Detector Tags: CD4060, security circuits, Time Delay

Simple Sound Alarm Generator using CD4011

This is Music Sound Generator circuit. It is basic and simple circuit. By use integrated circuit digital number CD4011 or MC14011 or TC14011,it be nand gate logic. By three this circuit is giving can the sound about 10watt by use 8ohm loudspeakers and use power supply voltage 12V. Friends can lead this circuit into pieces warn have a voice loud periodically. By control on-off the sound has with SW1 or Alarm Actuate Switch. The detail is other a friend sees in the circuit.

Be the first to comment - What do you think? Posted by admin - October 4, 2008 at 7:45 am

Categories: Audio diagram, Security Tags: CD4011, security circuits, Sound Alarm Generator

Easy kick out steal

Although the prevent steal or Circuit this be model to be easy the system is simple. but I thinks it may help can protect your assets. The principle is simple be the system Close Wire Loop. It will make a noise to warn when the circuit torn , by this circuit , use the electric energy while standby very low 0.5uA only. But when Relay work as a result use current about 70mA only. The usability can use in an automobile,house door, leak round a house or the other. When an electric line torn system , Relay command give beep danger circuit work immediately.