Easy Electronic Circuits and Projects

Laser Based Security Alarm Circuit

In this laser security alarm circuit , [Saddam] has used LM358 Dual Comparator IC for comparing voltages coming from LDR. Comparator is configured as Non-inverting mode and one 10K potentiometer is connected at its non-inverting terminal. An LDR is used for detecting light or laser light with respect to ground through a 10K resistor. And the midpoint of LDR and resistor is directly connected to inverting terminal of comparator.  A red LED is connected at output pin of comparator for indicating intruder detection. A mono-stable multi-vibrator is also used for activating buzzer and LED for a time period

Day and Night Indicator

In this day and night indicator project, [Saddam] has made a circuit which will indicate if there is a dark or light in the surroundings. Some applications of this circuit, are street light controlling, home/office light controlling, day and night indicators, etc. Check out the complete post on above link.

Dancing LED Circuit

This Dancing LED circuit is used for decorative purpose and looks very good when these LEDs glow in sequential manner. We can create many kind of Dancing LEDs patterns for decoration. In this particular circuit, we have created a pattern in which 6 LEDs are illuminating in forward and reverse order. To create this circuit we have mainly used 555 timer IC and 4017 IC.

LED Chaser Circuit

You may have seen different kinds of decoration lighting patterns. In this LED chaser circuit, [Saddam] have created an interesting LED blinking pattern by using a 555 timer IC and Decade Counter IC CD 4017.

Remote Controlled Light Switch

In this remote controlled switch circuit, [Jayant] have used a TV remote to ON/OFF the AC light by pressing any button of remote, and using the TSOP1738 at receiver end. Receiver circuit is connected to AC appliance via Relay, so that we can control the light remotely. We have used IC 4017 to convert it into a push ON, push OFF switch.