Software-Defined Radio with Android Smartphones
Software-defined radio (SDR) is one of the most important wireless communication technologies. It is a unique type of radio system that can tune to any frequency band. The SDR platform is...
PIN Diode Based Fire Sensor
Here is a PIN diode based fire sensor that activates an alarm when it detects fire. Thermistor based fire alarms have a drawback; the alarm turns on only if the fire...
Garden Solar Light
Most houses have backyard gardens or some open areas. Installing a garden light there provides visibility at night. But there can be problems in its installation since the wiring may hamper...
12V Battery Absorb and Float Charger
Most battery chargers stop charging the battery when it attains its maximum charging voltage set by the circuit. This 12V battery charger circuit charges the battery at a particular voltage, that...
Water Level Controller
Here is a simple, automatic water-level controller for overhead tanks that switches on/off the pump motor when water in the tank goes below/above the minimum/maximum level. The water level is sensed...
Solar Tracking System
Generally, solar panels are stationary and do not follow the movement of the sun. Here is a solar tracker system that tracks the sun’s movement across the sky and tries to...
Micro Inverter
A simple low-power inverter circuit is described here, which converts 12V DC into 230V AC. It can be used to power very light loads like night lamps and cordless telephones, but can...
LM386 Audio Amplifier
Here is a simple LM386 based audio amplifier circuit with the author’s prototype shown below.
LM386 based audio amplifier: circuit and working
Circuit diagram of the LM386 based audio amplifier is shown in...
Simple Low Power Inverter
Here is a simple low power inverter that converts 12V DC into 230-250V AC (DC to AC Converter). It can be used to power very light loads like window chargers and...
Beginners Guide to Resistor Colour Codes
This table will help you with managing resistor color code so that you don't burn up your circuit due to a wrong resistor.
Right below this image is a little tutorial to...
