30 DDm to +30 DDm Audio Level Meter

5 Zone alarm circuit

This is a complete alarm system with 5

a A Basic RF Transmitter for PIR Sensors

alarm control keypad

The IC is a quad 2 input "AND"

active ir motion detector

Project Objectives To explore how different

Combination Lock (PIC16F84)

digital combination lock

The circuit above above makes use of the CMOS

Door knob alarm

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electronic combination lock

This circuit is an Electronic Locker. It is

Digital AVR frequency meter

Frequency meter with some of quite good

Automatically switches off DMM

The circuit in Figure 1 lets you

Create multicolored LEDs

It is well-known that simultaneously mixing

Voltage curves on PC

The circuit uses a programmable current

Ultrasonic Parking Sonar Schematic

It works on the sonar principle, sending an

Battery Solutions for Energy Harvesting

Rechargeable batteries ‒ known as

Simple Gas Leak Detector Circuit

Here is the gas leakage circuit uses the

FTDI Infrared

Here is hobby project of building a home-brew