electronic combination lock LS7220

Simple Electronic Combination Lock

The following diagram is a very easy and simple electronic combination lock based on IC LS7220. Component Part List: C1 = 1uF 25V C2 = 220uF 25V R1 = 2.2K Ohm Q1 = 2N3904 / 2N2222 […]

Car Alarm Simulator Circuit Electronic

Car Alarm Simulator

This is a car alarm simulator which using the LED as a simulation output. This simple circuit can tell you whether your car is running or not by detecting the voltage difference when the car is […]

Safer Security System Alarm Circuit Electronic

Safer Security System Alarm

Here the circuit diagram of safer security system alarm. There are many security systems use a closed loop of wires and switches arranged so that whenever a door or window is opened, the loop will be […]

Multitone Alarm circuit electronic

DIY Simple Multitone Alarm

Here is the circuit diagram of simple multitone alarm. This is a low cost circuit which is simple and easy to build. The main components of this circuit is based on dual op-amp MC1458 and LM […]

DIY Electronic Cardlock Security System

Here is the DIY electronic cardlock security system that can be used as a lock to turn on dan turn off important electronic/electrical appliances. When card is inserted, depending upon the position of punched hole on […]

Car Audio System Anti Theft Security Circuit Diagram

Car Audio System Anti Theft Security

This is the circuit diagram of car audio system anti theft security which can be effectively used to protect and secure your expensive car audio system from stealing. This simple circuit designed based on popular CMOS […]

door knob alarm circuit electronic

Door Knob Touch Alarm

This is door knob touch alarm for your home security purpose. The alarm will be activated when someone touch the metal door knob. This circuit won’t work on full metal door.

Notebook Protector Circuit Electronic

Laptop / Notebook Protector

This is laptop / notebook protector circuit to protect your laptop or notebook or netbook from being stolen. Fixed in-side the laptop case, it will sound a loud alarm when someone tries to take the laptop. […]

Car Anti Theft Guard Circuit Electronic

Car Anti-Theft Protection with Buzzer

This is the circuit diagram of car anti-theft to protect and increase the security of your car, prevent your from stealing. This circuit is very simple, low cost and easy to built. When key-operated switch S2 […]

Digital Electronic Door Lock Security Key Circuit

Electronic Door Lock Security Key

This is the circuit diagram electronic door lock security key system. It means that this security system circuit is the combination of pressed key itself (not the mechanical). The output can be connected to drive the […]