Thursday, December 6, 2018

Project: Breathing LED Sleep Indicator using LM358

Eltronicschool. - This is one of project to build breathing LED sleep indicator using LM358 look like shown in Figure 1. The main component in this project is used LM358 IC.

In this project will show you as replica of the iconic breathing pattern used for the “sleep” indicator in Apple computers. But in this design only using popular analog component although it will help using microcontroller to build pulse-wide modulation. In this project we will give beside circuit schematic, we also will give you component are needed and also global description.

Circuit Schematic

Figure 1. Circuit schematic of breathing LED sleep indicator using LM358
(Source: Electroschematics)

Component Part
  1. LM358
  2. Resistors
  3. LED
  4. Transistor BC547
  5. Capacitor
Description

Circuit schematic look like shown in Figure 1 above is breathing LED sleep indicator using LM358.  Electroschematics site describe that the design is centered entirely around one popular dual-operational amplifier LM358 (IC1) to slowly fade a green light-emitting diode (LED1) in a special pattern (the so-called breathing effect). The circuit runs well with a regulated supply voltage of 5 V; higher-level voltages are not recommended. If the two-way jumper (JP1) in the circuit is in “test” mode, the circuit will work as a standalone indicator. But moving the jumper position to “normal” mode, a TTL high-logic signal input is required to enable (EN) the indicator. This option is added deliberately so that we can enable/disable the Sleepy-LED Eye using the existing microcontroller (uC) in a project — just one free I/O port of the concerned uC is needed there. For example, one I/O port of the uC can be programmed to wake-up the Sleepy-LED Eye only when the system is in its standby state.

Tuesday, November 6, 2018

Circuit Schematic Simple DC Dimmer Lamp using LM358

Eltronicschool. - This is oen of the best simple DC dimmer lamp based on IC LM358 look like shown in Figure 1 and Figure 2 below. The main component needed int his circuit is LM358 and MOSFET IRLZ44.

In this time, beside we will give you the circuit schematic of simple DC dimmer lamp using LM358, we also will give you the global description of this circuit came from the original source.

Circuit Schematic

Figure 1. Circuit schematic of pulse-width modulation control (Source: https://www.electroschematics.com)

Figure 2. Circuit schematic of The Power Driver Dimmer Lamp (Source: https://www.electroschematics.com)

Component Part
  1. LM358
  2. IRLZ44 Mosfet
  3. Resistors
  4. Variable resistor
  5. Diode
  6. Capacitors
Description

According Electroschematics site describe sometimes you want to have specific modules in your lab that are not available off the shelf — a compact DC dimmer/regulator module, for example. That’s why I decided to develop my own module, which consists of just a few standard electronic components. The module can be used as a key element to control the brightness of DC lamps and/or the speed of small DC motors in portable hand tools like your PCB drill.

In this basic, op-amp–based, astable design, components R1 and C1 set the operating frequency as the astable operation relies on repeatedly charging and discharging the capacitor from the output of the op amp through the resistor. The other three resistors (R2, R3, and R4) control the minimum and maximum voltage that the capacitor charge comes across during a cycle of oscillation. The output at the capacitor (Pin 2 of IC1) is shaped like a sawtooth wave, but a square wave (SQW) is available from the output (Pin 1 of IC1) of the oscillator. For the given configuration, the frequency is fairly close to 5 kHz.

Tuesday, October 9, 2018

Circuit Schematic 8051 Microcontroller Based Ultrasonic Object Detection

Eltronicschool. - This is one of the ultrasonic range sensor for detecting object for you in this time to show you one of the circuit schematic of 8051 Microcontroller Based Ultrasonic Object Detection like shown in Figure 1 below.

In this project based on ultrasonic sensor module and microcontroller 8051. In this time beside we will show you about the circuit schematic, we also will give you the global description about this project.

Circuit Schematic

Figure 1. Circuit Schematic of 8051 Microcontroller Based Ultrasonic Object Detection (Source: https://www.elprocus.com)

Component Part
  1. Ultrasonic sensor module
  2. 8051 microcontroller
  3. LCD
  4. LED
  5. Crystal
  6. Transistors, Diodes, Capacitors, and Resistors
  7. Transformer
  8. Voltage Regulator
  9. Magnetic Gun
Description

According elprocus site describe that this circuit is designed with an 8051 micro-controller and an ultrasonic sensor. The sensor transmits the ultrasonic sound waves of kHz. When an object or obstacle comes ahead of the sensor, the sound waves are reflected. Then the receiver detects the kHz sound wave.

The circuitry converts the sound signals to electrical signals which are fed to the microcontroller interfaced. The microcontroller receives the signals and actuates the output to take appropriate action. The LCD interfaced to the microcontroller is used to display the status of the module.

This project can be enhanced to calculate the distance of the object and find the location of the object.

Thursday, September 20, 2018

Project: How to Build a Voltage Sensor using LM741

Eltronicschool. - This is one of project to build voltage sensor using LM714. The main circuit schematic of voltage sensor using LM741 shown look like Figure 1. The main component in this project is LM741 IC.

In this time we will show you one project of voltage sensor circuit schematic based on LM741. Beside circuit schematic shown, we also will give you global description about this project.

Circuit Schematic

Figure 1. Circuit schematic of voltage sensor using LM741.
(Source: http://www.learningaboutelectronics.com)

Component Part
  1. LM741
  2. Resistor
  3. LED
Description

Circuit schematic like in Figure 1 above is voltage sensor using LM741. The main component used in this project is LM741. 

How it works

According learning about electronics site describe that reference voltage of 5V connected to the inverting terminal. This 5V forms our voltage threshold level. If the voltage at the noninverting terminal is less than 5V, then the output will be off or LOW. If the voltage at the noninverting terminal is greater than 5V, the output will be on or HIGH. To the noninverting terminal, we connect the test voltage signal we want to test.

How the circuit works is very basic. If the voltage at the noninverting terminal is less, the LED is off. If it is greater, the LED turns on. This is how we form a voltage sensor circuit based on any voltage value. We can, of course, change the voltage anywhere from -15V to +15V.

If you want to be able to constantly vary the voltage, you can place a potentiometer either at the inverting terminal or noninverting terminal or both and connect it to greater voltage to get a greater varying range. But this is how a basic voltage sensor can work. 

Tuesday, September 4, 2018

IoT Project: Air Pollution Meter With Digital Dashboard On Smartphone using Blynk

Eltronicschool. - This is one of the application of Internet of Things for any project such as for building air pollution mater with digital dashboard on smartphone using Blynk appication.

The main component are used to build this project are temperature and humidity sensor DHT11, Arduino UNO with Ethernet shield, PM2.5/PM10 sensor (SDS011), and power supply.

For the application (App) as the web server using Blynk. Blynk is an Internet of Things (IoT) platform to control Arduino, Raspberry Pi and the like over the Internet. In this project Blynk provides a digital dashboard on your smartphone that displays real-time air quality readings for the immediate surroundings.

Blynk is not meant for a specific board or shield. It will get you online and ready for the IoT, irrespective of whether Arduino or Raspberry Pi is linked to the Internet over Wi-Fi, Ethernet or an ESP8266 chip.

In this project, we will show you about the circuit schematic of the IoT enabled air pollution meter with digital dashboard, main component used, and the global description about this project.

Circuit Schematic

Component Part
  1. Temperature and humidity sensor DHT11, 
  2. Arduino UNO with Ethernet shield, 
  3. PM2.5/PM10 sensor (SDS011), and 
  4. Power Supply
Description

Circuit schematic like in Figure 1 above is the IoT enabled air pollution meter with digital dashboard. Electronicsforu site describe that Heart of the circuit is Arduino Uno board with Arduino shield. Other components used are voltage regulators 7805 (IC1 and IC2), temperature and humidity module DHT11 connected to connector CON3, gas sensor MQ135 connected to connector CON2, PM2.5/PM10 sensor connected to connector CON1 and a few others.

PM2.5/PM10 sensor (SDS011)

Particle pollution, also called particulate matter (or PM), is a mixture of solid particles and liquid droplets floating in the air. Some particles are released directly from a specific source, while others are formed in complicated chemical reactions in the atmosphere.

The PM2.5/PM10 sensor connected across CON1 was developed by INOVAFIT, which is a spin-off from University of Jinan, China. It uses the principle of laser scattering in the air, and can detect suspended particulate matter concentration ranging from 0.3 to 10 microns. Data collected by the sensor is stable and reliable. SDS011 sensor is connected to UART port (TX and RX) of Arduino Uno board.

Gas sensor (MQ135)

Sensitive material of the sensor is tin-dioxide, whose conductivity increases with the concentration of gas. Change in conductivity is converted into output voltage signal, which varies corresponding to the concentration of combustible gas. MQ135 is highly sensitive to ammonia, sulphide and benzene steams, smoke and other harmful gases. It is a low-cost sensor, suitable for different applications. Output of the gas sensor is connected to analogue input pin A3 of Arduino Uno board through connector CON2.

Temperature and humidity sensor (DHT11)


This composite sensor contains calibrated digital signal outputs of temperature and humidity. Connected to connector CON3, it includes a resistive-type humidity measurement component and an NTC temperature-measurement device. Its output pin is connected to digital pin 5 of Arduino Uno board. It is a relatively inexpensive sensor for its performance.

Tuesday, July 31, 2018

Circuit Schematic HC-SR04 Ultrasonic Range Sensor

Eltronicschool. - This is one of the ultrasonic range sensor for you in this time to show you one of the circuit schematic of HC-SR04 ultrasonic range sensor like shown in Figure 1 below.

In this project with circuit schematic of HC-SR04 ultrasonic range sensor, you will show an how you can build the power inverter using special low cost in this time. 

Circuit Schematic

Figure 1. Circuit Schematic of HC-SR04 Ultrasonic Range Sensor (Source: Electroschematics)

Component Part
  1. STC11F (single-chip microcontroller, based on 1T architecture 80C51 CPU)
  2. MAX232 (dual EIA-232 driver/receiver)
  3. TL074 (low-noise JFET-input operational amplifier)
  4. 40-KHz ultrasonic transmitter and receiver pair (40T/R-B/W)
Description

According Electroschematics site describe thatthe HC-SR04 ultrasonic range sensor is a pretty cool pre-wired module that you actually enjoy using when you start playing with electronics, microcontrollers, and robotics. As you might have noticed, the most popular version of the module (comprised of an ultrasonic transmitter, ultrasonic receiver, and control electronics) has four interface pins — Vcc (5 V), Gnd (0 V), Trigger (Pulse In), and Echo (Pulse Out). The operating current of the module is about 15 mA at 5-V DC input, and its operating frequency is 40 KHz. The measuring range of the module is in the 2- to 400-cm range with a measuring angle of 15°.

Thursday, July 19, 2018

Circuit Schematic Signal Tracer Circuit using 741 IC

Eltronicschool. - This is one of the tester for signal tracer project for you in this time to show you one of the circuit schematic of signal tracer circuit using 741 IC look like shown in Figure 1 below.

In this project with circuit schematic of Signal Tracer Circuit using 741 IC, you will show an how you can build the power inverter using special low cost in this time. 

Circuit Schematic

Figure 1. Circuit schematic of Signal Tracer Circuit using 741 IC (Source: Circuitstoday.com)

Component Part
  1. Transistor
  2. 741 IC
  3. Capacitors
  4. Resistors
  5. Speaker
  6. Variable Resistor
  7. Detail component value see in Figure 1.
Description

Circuit schematic like in Figure 1 above is Signal Tracer Circuit using 741 IC. The main component in this circuit schematic is transistors and 741 IC.

According Circuitstoday site describe that a high gain amplifier circuit that can be operated from a battery pack of 6 or 9 volt battery pack is shown here.The IC1 uA 741 is wired as a high gain non-inverting amplifier and its output is amplified by a pair of complementary transistors (Q1 & Q2) to drive the speaker.The negative feedback from the common emitter junction of the two transistor stabilizes the gain of the circuit.The resulting audio output is sufficient to serve as a signal tracer.

Wednesday, July 11, 2018

Circuit Schematic 12VDC to 220V 50Hz at 500W Power Inverter using 2N3055

Eltronicschool. - This is one of the power inverter project for you in this time to show you one of the circuit schematic of 12VDC to 220V 50Hz at 500W Power Inverter using 2N3055.

In this project with circuit schematic of 12VDC to 220V 50Hz at 500W Power Inverter using 2N3055, you will show an how you can build the power inverter using special low cost in this time. 

Circuit Schematic

Component Part
  1. Diodes
  2. Capacitors
  3. Transistor
  4. 2N3055
  5. Detail component see in Figure 1.
Description

Circuit schematic like in Figure 1 above is 12VDC to 220V 50Hz at 500W Power Inverter using 2N3055. The main component in this circuit schematic is transistors and special transistor named 2N3055.

According Eleccircuit site describe that this circuit will accommodate all your needs. It is a simple circuit. The same principle, I take battery voltage 12V to produce a oscillator about 100 Hz and pass to a two frequency divider circuit is only 50HZ. And drive a 10 ampere transformer with 10 x 2N3055 transistor in parallel. By a single transistor has 2A, when I use 10 transistors or 5 pairs of drive high current output. The complexity of circuit, but the principle is not it, and it is the number of transistors on a basic, easy to buy. You may be modified 100 watt power inverter To the size of transistors and transformers as well.

Friday, June 8, 2018

Introduction of Function Generator Working with Block Diagram

Eltronicschool. - Maybe you will not foreign again with the function generator in electronic field now. This device will give you the output signal like sinous, square, and pulse for your project.

In this time we will show you the introduction of the function generator working with the block diagram look like in Figure 1 below.

Blog Diagram of Function Generator

Figure 1. Block Diagram of Function Generator (Source: Circuitstoday.com)

Description

This is the function generator working for you. Accordingly Circuitstoday blog describe that a function generator is a signal source that has the capability of producing different types of waveforms as its output signal. The most common output waveforms are sine-waves, triangular waves, square waves, and sawtooth waves. The frequencies of such waveforms may be adjusted from a fraction of a hertz to several hundred kHz.

The block diagram of a function generator is given in the figure. In this instrument, the frequency is controlled by varying the magnitude of the current that drives the integrator. This instrument provides different types of waveforms (such as sinusoidal, triangular and square waves) as its output signal with a frequency range of 0.01 Hz to 100 kHz.

The frequency controlled voltage regulates two current supply sources. Current supply source 1 supplies a constant current to the integrator whose output voltage rises linearly with time. An increase or decrease in the current increases or reduces the slope of the output voltage and thus controls the frequency.