Saturday, April 20, 2019

# Basic Electronics

### Basic remote tester

Description: This circuit can be used for testing your TV, DVD, VCD, etc. remote control. This is the fundamental module for making infrared based...

### Light dependent blinker using LDR and CD4093

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...

### Remote operated switch DIY kit

Description: Here's a simple do-it-yourself (DIY) remote operated switch. You can use this simple kit to switch ON/OFF any appliances working on 220V AC. This...

### Mode of NE555- Astable

This circuit has been configured in Astable mode. The output pulses are determined by the values of resistors R1, R2 and the timing capacitor C1. The formula for the frequency of pulses is: f= 1.44/[(R1+2R2)*C1].

### Water Level Indicator

We can use the logic of making an automatic light detector to make a simple water level indicator.We just need to remove LDR from the circuit and put the wires into water, then it simply works as water level indicator. There is a specific resistance between the wires that are dipped into water and conduction of electricity through water gives biasing voltage to base of transistor. The sensitivity can be adjusted using VR1. Put 470K variable resistance in VR1.

### Mode of NE555- Astable

This circuit has been configured in Astable mode. The output pulses are determined by the values of resistors R1, R2 and the timing capacitor C1. The formula for the frequency of pulses is: f= 1.44/[(R1+2R2)*C1]. The high and low time of each pulse can also be calculated.

### Dark/Light sensor using transistor

Automatic Light detector using variable resistor A light detector senses light. As the light level increases and LDR meets the lowest threshold resistance, the circuit automatically turns on the LED D1. We can adjust the sensitivity using the preset VR1-10K. LESS RESISTANCE(VR1)-> LESS DARKNESS TO SWITCH OFF THE LED HIGH RESISTANCE(VR1)-> MORE DARKNESS TO SWITCH OFF THE LED

### How to make an FM transmitter

After getting several comments from young electronic students , I am rewriting this article to make the FM transmitter making process more clear. This tutorial...

### About relay module for clap switch- operate 100-240V appliance

Description: This is a dependent DIY kit module that has to be used with a clap_switch available at buildcircuit.net. This kit DOES NOT work...

### How to connect a lamp to DIY relay module for the popular clap switch

If you have come to this page from a search engine, we recommend you to visit the following pages: 1. About Relay module for the...

### Test UM3481 musical circuit

The M348X series IC is a mask-ROM-programmed multi melody generator , implemented by CMOS technology.It is designed to play the melody according to the previously...

### BuildCircuit’s breadboard power supply DIY kit

Here is a very simple breadboard power supply kit that takes power from a DC wall wart and outputs a selectable 5V or 3.3V...

### Building a circuit on a breadboard

A breadboard is a device for testing temporary electronics projects. Components used to test a circuit can be reused for other projects. None of the components are damaged. Almost all people start to learn electronics using breadboard because it is the simplest way of making circuit. The photograph shows a typical small breadboard which is suitable for beginners building simple circuits with one or two ICs (chips).

### Multivibrator

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.

The circuit is ready for testing. Connect battery terminals and see the output. As you block light falling on LDR(Light dependent resistor), the LED glows. OUTPUT: [youtube]http://www.youtube.com/watch?v=qmWAgoHwy3w[/youtube] THIS CIRCUIT IS EXTREMELY SENSITIVE TO DARKNESS. EXPERIMENT THE CIRCUIT IN A HIGHLY ILLUMINATED ROOM. LED GLOWS EVEN IN LESS DARKNESS. Use torch light if the LED glows in less darkness. You can adjust the sensitivity of the circuit using a variable resistor in place of R3-300Ohm. Try this circuit with other resistances as well, for example, 1K, 10K and 100K, etc.

### Telephone misuse indicator

When the phone line is in idle condition (on hook), the full voltage of 48V DC from the exchange appears across the line. When the phone is engaged by lifting the hand set, the voltage across the line falls down to around 12V. Thus, under idle condition (48V), VR1 is adjusted to give a positive biasing voltage to the base of Q3. As Q3 conducts Q1 gets into reverse bias and stops conduction. If the phone is engaged, Q3 stops conducting due to voltage drop across the lines, and subsequently, Q1 and Q2 starts oscillating and beeping is heard. Thus, this circuit can be used as an indicator for telephone tapping and misuse by an unauthorized person.

### Super Easy Electronics Projects for Absolute Beginners

There are hundreds of electronics projects published on buildcircuit.com. This time we have selected few projects that should be easier for beginners to start...

### Remote Tester

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.
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