Digital code lock

Description. This is a simple but effective code lock circuit that has an automatic reset facility. The circuit is made around the dual flip-flop IC CD4013.Two CD 4013 ICs are used here. Push button switches are used for entering the code number. One side of all the push button...

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Simple Electronic Combination Lock (IC LS 7220)

Description This is the circuit diagram of a simple electronic combination lock using IC LS 7220.This circuit can be used to activate a relay for controlling (on & off) any device when a preset combination of 4 digits are pressed.The circuit can be operated from 5V to...

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3 Input Mic Mixer Circuit

Here is a simple 3 input mic mixer circuit using the popular uA 741 ICs. Four 741s are used here.IC1, IC2, IC3 are used as preamplifiers. They produce a gain of around 40 decibel to the individual input signals. The IC4 is wired as a summing amplifier to add the signals from...

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Musical Bell (UM 66)

This circuits uses very few component and gives melody sound. It uses 3 terminal IC UM66 and can be build small enough to be placed inside a greeting card and operated off a single 3V flat button cell. There is not much to the circuit. The UM66 is connected to its supply...

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The Universal Timer

Now, a day automation task is necessity not only in industrial sphere but even in the domestic sphere. The project universal timer in this website is unique because it offer an ultra wide range of time period having pin point precision anywhere (i.e. not affected by ant...

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XS1B (Motor Bike)Wiring Diagram

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5 channel radio remote control

TX-2B / RX / 2B  5 channel radio remote control. This article is about a simple 5 channel radio remote control circuit based on ICs TX-2B and RX-2B from Silan Semiconductors. TX-2B / RX-2B is a remote encoder decoder pair that can be used for remote control applications....

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Seven Segment Counter Display Circuit

Here is the circuit diagram of a seven segment counter based on the counter IC CD 4033.This circuit can be used in conjunction with various circuits where a counter to display the progress  adds some more attraction.IC NE 555 is wired as an astable multivibrator for triggering...

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IR Burglar Alarm for Basic Home security system

IR based entry detector alarm is useful for someone crosses the Gate or door of house when is left open.. It can alarm you and notify you that someone entered into the door or place.. This project will be used at Doors/ Entrance of office to get alert the owner or admin to...

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Cable LAN Tester Circuit

Here iscable LAN testercircuit. Thecable LAN testercircuit can also to test cable on telephone, coaxial cable, Lan cable and other. Thiscable LAN testercircuit using led for main indicator device. This simple cable LAN tester circuit, can be make in home. Designed initially...

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