Dark sensor

Dark sensor on breadboard

By Sagar Sapkota

In Basic Electronics

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Arduino

An experiment with LDR and Arduino

By Sagar Sapkota

It is a very simple experiment for Arduino amateurs, kids and beginners. It needs two LEDs, one LDR (Light Dependent Resistor), one tactile switch and some resistors of different values..

Arduino

Amarino project- Arduino and Android based light sensor

By Sagar Sapkota

With this project/application, you can make a light sensor dependent lamp. You can make a light sensor or dark sensor with this application. The light sensor of your Android smart.

Experiments with 741- Operational amplifier

By Sagar Sapkota

In Basic Electronics

Description: This versatile 741 operational amplifier module can be used for making a dark detector using an LDR, a photo transistor and a photo diode. The amplifier has been configured in inverting mode. It compares the change in voltage at pin 2 with the reference...

Basic Electronics

Clap switch using 3 different modules

By Sagar Sapkota

Description: In this clap switch we use three different modules given below. It is necessary to make these three modules in order to make a clap switch. a. Dark sensor.

Basic Electronics

Experiments with LM358

By Sagar Sapkota

Description: LM358 is also one of the types of operational amplifier. LM358 consists of two independent, high-gain, frequency-compensated operational amplifiers designed to operate from a single supply over a wide range.

Monostable module

By Sagar Sapkota

In Basic Electronics

Description: In the monostable mode, the 555 works as a "one-shot" pulse generator. Other applications of monostable mode include timers, pulse-width modulation (PWM), missing pulse detection, touch switches, frequency divider, capacitance measurement, bouncefree switches and so on. (more…)

Basic Electronics

Light activated police siren using 555 timer and light dependent resistor(LDR)

By Sagar Sapkota

Here's a simple light activated police siren using light dependent resistor and NE555 timer. Before you make this project, I would recommend you to make the following projects. a. Light.

Basic Electronics

Light dependent blinker using LDR and CD4093

By Sagar Sapkota

Here's a simple experiment with LDR and CD4093. This is just a modification of a previous project "dark sensor using 2 transistors". In this project, the CD4093 is configured in.

Dark sensor using two transistors

By Sagar Sapkota

In Basic Electronics

This works same as the other dark detector circuit. When light is falling on LDR, its low resistance drives transistor Q1-BC547 into conduction. This keeps transistor Q2 cut-off due to low base bias. The D1-LED does not get power as long as ambient light falls...

Basic Electronics

Light operated switch

By Sagar Sapkota

To make light operated switch, you need to know these circuits: a. Toggle switch b. Dark sensor using two transistors (more…)

Basic Electronics

Remote Operated Switch

By Sagar Sapkota

To make a remote operated switch, you need to understand following circuits. I recommend you to make these circuits before you try a remote operated switch. (more…)

Basic RC circuit

By Sagar Sapkota

In Basic Electronics

Basic RC circuit Using an RC circuit, we can keep an LED on for specific time as determined by resistors R1, R2 and capacitor C1. As we press the Push-to-On switch, the capacitor C1-1000uF gets charged and it gives biasing voltage to the transistor Q1...

Basic Electronics

FM transmitter and Dark sensor

By Sagar Sapkota

A dark sensor can be converted to a simple FM transmitter using the following components. This FM transmitter is very sensitive and it has transmitting range of 30 meters. (more…)

Basic Electronics

Dark sensor using BC557

By Sagar Sapkota

An automatic dark sensor can be made using a PNP transistor(BC557). (more…)

AM receiver from dark sensor

By Sagar Sapkota

In Basic Electronics

The Darlington transistor (often called a Darlington pair) is a semiconductor device which combines two bipolar transistors in a single device so that the current amplified by the first is amplified further by the second. This configuration gives a high current gain (written β, hfe, or hFE) and can...

Basic Electronics

Object counter using LDR and calculator

By Sagar Sapkota

[vc_row][vc_column][vc_column_text]To make an object counter we can use a simple dark detector circuit and a normal calculator. Pole and NO (Normally Open) terminals of a relay have to be connected.

Basic Electronics

Multivibrator

By Sagar Sapkota

A multivibrator is an electronic circuit used to implement a variety of simple two-state systems such as light emitting diodes, timers and flip-flops. It is characterized by two amplifying devices.

Remote Tester

By Sagar Sapkota

In Basic Electronics

Remote tester circuit also resembles the logic of a "dark sensor (using BC557)”. LDR has been replaced with IR sensor TSOP 1738. The circuit works as a remote tester. Pressing a remote control switch near the IR sensor, switches on the LED D2. (more…)

Basic Electronics

Voltage Divider Rule

By Sagar Sapkota

A voltage divider consists of two resistances R1 and R2 connected in series across a supply Voltage Vs. The supply Voltage is divided up between the two resistances to give.