The dark-activated alarm is a circuit that is used to identify darkness or loss of light. It only produces an alarm sound in darkness because in the presence of light the alarm buzzer does not … Read more
Arooha Dar
A multi-tone generator is often called a signal generator. A tone generator circuit is a simple electronic circuit, which has wide applications in different domains. The circuit below generally creates different levels of sound frequencies … Read more
Simple Multi-Tone Generator Circuit using Transistors
A Relay Flasher circuit is used for operating the flashlights in various ways for many purposes such as a flashlight for a car. The relay needs a certain current draw before it starts flashing tasks, … Read more
Simple Relay Flasher Circuit with NE555 Timer
The light fence circuit is used to detect the presence of any person or object in a specific area. The Light Fence Circuit detection range is around 1.5 to 3 meters. Designing the circuit using … Read more
Automatic Light Fence Circuit with Alarm
A charge pump is a kind of converter that uses energetic charge storage condensers to increase or decrease voltage. Charge-pump circuits, while being electrically simple circuits, are capable of high efficiencies, often as high as … Read more
Charge Pump Circuit – Getting Higher Voltage from Low Voltage Source
Many electronics struggle with Tracing Curves, whether it be the smooth VI line of a capacitor or the voltage of a collector transistor against the current curve. Those curves give one an intuitive view of … Read more
Simple Curve Tracer Circuit for Resistor, Diode, and Transistor
The battery level monitor circuit can be used to indicate the required low battery level. This is an opamp IC 741 low battery alarm indicator circuit that can be used to control a specific low … Read more
Battery Level Monitor Using TL071 IC
Electronic devices, such as computers, printers, air conditioners, televisions, etc., use electricity when in use but still use some electricity when not in use; most electronic devices have power-off switches but still use some power … Read more
Electronic Appliances Switch Left open Indicator
This circuit warns when a vehicle such as a car, jeep, bus, etc gets overheated, or its temperature rises above a safe level. The circuit will warn with a buzzer beep and an LED flashing. … Read more
Car Engine Overheat Detector Alarm
Rechargeable batteries have very good efficiency and life if we look after them. There are many things to do to take good care of your rechargeable batteries that do not charge them in fast mode … Read more
Low Battery Voltage Cut-off OR Disconnect
The high / over temperature sensor or detector alarm is a circuit that senses the temperature of the circuit and activates the alarm and flashes the LED when the temperature rises above normal. Thermocouples or … Read more
High / Over Temperature Sensor Alarm
A frequency-to-voltage converter is an electrical system that transforms the frequency of sinusoidal input into an equivalent current or output voltage. Frequency-to-voltage conversion transforms frequencies or signals such as voltage or current to the corresponding … Read more
Frequency to Voltage Converter using KA331 IC
The simple 12V battery status indicator is a circuit that shows the battery state only by flashing LEDs. For example, if out of 10 six LEDs are glowing it means 60 percent of the battery … Read more
Simple 12V Battery Status Indicator
Here we’ll teach you how to create a 555 timer IC LED Roulette Circuit and let you know what roulette is before beginning the tutorial, it’s a casino game called after the French word meaning … Read more
LED Roulette Circuit using 555 timer IC
The door alarm is a very popular protection system and is useful. They are used to see whether the Door is open or locked. We have also noticed any door sensor in the fridge creating … Read more
Magnetic Door Alarm Circuit using Hall Sensor
As a signal goes through a rapid shift from base to higher value and after some period returns back to base value from higher value. It is considered a pulse signal. A Missing Pulse Detector … Read more