Este documento describe cómo construir un circuito oscilador controlado por voltaje utilizando un circuito integrado LM556. El circuito contiene dos osciladores, uno que produce pulsos lentos y otro más rápido, cuya frecuencia es controlada por el primer oscilador para producir un efecto de sirena. Se proporcionan diagramas esquemáticos y de diseño de la placa de circuito impreso, así como una lista de componentes necesarios para construir el circuito.
DC motors
Torque & Speed Equations
Torque -Armature current Characteristics
Speed - Armature current Characteristics
Torque-speed characteristics
Applications
Speed Control
Control functions/programmable logic
Commands for control of CB and of isolators
Graphical visualization of switch positions
Control via keyboard, binary inputs, DIGSI 4 or SCADA system
User-defined logic with CFC (e.g. interlocking)
DC motors
Torque & Speed Equations
Torque -Armature current Characteristics
Speed - Armature current Characteristics
Torque-speed characteristics
Applications
Speed Control
Control functions/programmable logic
Commands for control of CB and of isolators
Graphical visualization of switch positions
Control via keyboard, binary inputs, DIGSI 4 or SCADA system
User-defined logic with CFC (e.g. interlocking)
The bridge uses for measuring the value of unknown resistance, inductance and capacitance, is known as the AC Bridge. The AC bridges are very convenient and give the accurate result of the measurement.The construction of the bridges is very simple. The bridge has four arms, one AC supply source and the balance detector. It works on the principle that the balance ratio of the impedances will give the balance condition to the circuit which is determined by the null detector.
The standard electromechanical RCCBs are designed to work with normal waveform power and cannot be guaranteed to work if any standard waveforms are generated by loads. The most common is the rectified half-wave waveform, sometimes referred to as pulsed direct current, generated by speed control devices, semiconductors, computers, and even dimmers.
Preventing circulating current in parallel generator applicationsMirus International
As the need for secure and reliable electricity has gown, many opportunities for distributed generation have appeared. Diesel, Natural Gas, Biofuel or other generators used for these applications often run in parallel with themselves or with Utility transformers. This can result in high levels of triple frequency (180Hz in 60Hz systems) circulating current in the common neutrals or ground connections. These circulating currents can cause overheating in the generator windings and false tripping of overcurrent protection devices, especially ground fault schemes.
Mirus’ GenLink Dissimilar Pitch Neutral Limiter (DPNL) is a uniquely wound, multiple coil reactor which can be very effective in blocking the flow of circulating current without negatively impacting system fault levels.
MIRUS’ President & CEO, Tony Hoevenaars P.Eng, covered how paralleling generators can lead to very high neutral circulating currents and what can be done to control them. The problem is particularly evident when the generators are built with dissimilar pitches but is also very common when generators are paralleled with Utility transformers for Distributed Generation.
In the webinar, attendees learned about:
- Understanding Generator Pitch and Harmonics
- How Circulating Current Problems Start
- Effective Method for Reducing Circulating Current
- Adding Circulating Path Impedance without Effecting Ground Fault Path
- Sizing Neutral Blocking Solution for Specific Applications
- Real-World Case Studies
Module 2 ee369 KTU syllabus-high voltage ac generation,resonant circuitsAsha Anu Kurian
Generation of high AC voltages-Testing transformer – single unit testing transformer, cascaded transformer – equivalent circuit of cascaded transformer – generation of high frequency AC voltages- series resonance circuit – resonant transformer – voltage regulation.
The bridge uses for measuring the value of unknown resistance, inductance and capacitance, is known as the AC Bridge. The AC bridges are very convenient and give the accurate result of the measurement.The construction of the bridges is very simple. The bridge has four arms, one AC supply source and the balance detector. It works on the principle that the balance ratio of the impedances will give the balance condition to the circuit which is determined by the null detector.
The standard electromechanical RCCBs are designed to work with normal waveform power and cannot be guaranteed to work if any standard waveforms are generated by loads. The most common is the rectified half-wave waveform, sometimes referred to as pulsed direct current, generated by speed control devices, semiconductors, computers, and even dimmers.
Preventing circulating current in parallel generator applicationsMirus International
As the need for secure and reliable electricity has gown, many opportunities for distributed generation have appeared. Diesel, Natural Gas, Biofuel or other generators used for these applications often run in parallel with themselves or with Utility transformers. This can result in high levels of triple frequency (180Hz in 60Hz systems) circulating current in the common neutrals or ground connections. These circulating currents can cause overheating in the generator windings and false tripping of overcurrent protection devices, especially ground fault schemes.
Mirus’ GenLink Dissimilar Pitch Neutral Limiter (DPNL) is a uniquely wound, multiple coil reactor which can be very effective in blocking the flow of circulating current without negatively impacting system fault levels.
MIRUS’ President & CEO, Tony Hoevenaars P.Eng, covered how paralleling generators can lead to very high neutral circulating currents and what can be done to control them. The problem is particularly evident when the generators are built with dissimilar pitches but is also very common when generators are paralleled with Utility transformers for Distributed Generation.
In the webinar, attendees learned about:
- Understanding Generator Pitch and Harmonics
- How Circulating Current Problems Start
- Effective Method for Reducing Circulating Current
- Adding Circulating Path Impedance without Effecting Ground Fault Path
- Sizing Neutral Blocking Solution for Specific Applications
- Real-World Case Studies
Module 2 ee369 KTU syllabus-high voltage ac generation,resonant circuitsAsha Anu Kurian
Generation of high AC voltages-Testing transformer – single unit testing transformer, cascaded transformer – equivalent circuit of cascaded transformer – generation of high frequency AC voltages- series resonance circuit – resonant transformer – voltage regulation.
Montaje de una fuente de alimentacion de laboratorioJomicast
Se describe el montaje y funcionamiento de una fuente de alimentación de laboratorio. Capaz de suministrar una tensión comprendida entre 0 y 45 voltios y una corriente máxima de 2 amperios. Con esta fuente se consigue dar una solución en la aplicación de diferentes tensiones y corrientes para el correcto funcionamiento en equipos y circuitos electrónicos. Haciendo de instrumento de prueba para circuitos y equipos prototipos de investigación y desarrollo.
Una aplicación práctica para conocer los circuitos electrónicos que tienen la función de detectar el movimiento de personas a traves de cargas electrostáticas.
ROMPECABEZAS DE ECUACIONES DE PRIMER GRADO OLIMPIADA DE PARÍS 2024. Por JAVIE...JAVIER SOLIS NOYOLA
El Mtro. JAVIER SOLIS NOYOLA crea y desarrolla el “ROMPECABEZAS DE ECUACIONES DE 1ER. GRADO OLIMPIADA DE PARÍS 2024”. Esta actividad de aprendizaje propone retos de cálculo algebraico mediante ecuaciones de 1er. grado, y viso-espacialidad, lo cual dará la oportunidad de formar un rompecabezas. La intención didáctica de esta actividad de aprendizaje es, promover los pensamientos lógicos (convergente) y creativo (divergente o lateral), mediante modelos mentales de: atención, memoria, imaginación, percepción (Geométrica y conceptual), perspicacia, inferencia, viso-espacialidad. Esta actividad de aprendizaje es de enfoques lúdico y transversal, ya que integra diversas áreas del conocimiento, entre ellas: matemático, artístico, lenguaje, historia, y las neurociencias.
Instrucciones del procedimiento para la oferta y la gestión conjunta del proceso de admisión a los centros públicos de primer ciclo de educación infantil de Pamplona para el curso 2024-2025.
1. Liceo Politécnico ANDES
ELECTRONICA 2º MEDIO
CONSTRUCCION DE PLACA DE CIRCUITO IMPRESO
Prof. JORGE GONZALEZ
OBJETIVOS: Medir parámetros eléctricos en circuitos electrónicos. Aplicar técnicas de
mecanizado básico. Interpretar diagrama esquemático. Montar correctamente componentes
electrónicos.
INTRODUCCIÓN: Este circuito tiene como elemento principal un circuito integrado LM556
(contador de tiempo dual), que internamente esta formado por dos LM555, Cada mitad
del 556, esta conectado como un circuito oscilador o multivibrador astable.
Disposición de terminales del circuito integrado
LM 556
El primer oscilador produce pulsos de muy baja frecuencia, más o menos 15 por segundo,
debido al alto valor del condensador formado por C2 y C3 en paralelo, 1500 µF en total y a las
resistencias Rl y R2. El segundo oscilador, trabaja a una frecuencia mucho más alta, más o
menos a 2000 ciclos por segundo, debido a los valores de R3, R4 y al condensador C5 de 0.01 µF.
La señal de salida del primer oscilador se utiliza para variar la frecuencia del segundo oscilador
produciendo así el efecto de sirena.
Este tipo de circuito se denomina Oscilador controlado por voltaje o VCO.
La salida de este circuito se puede conectar a la entrada de un circuito amplificador de potencia
para lograr un alto volumen. Esta conexión se ilustra en la figura siguiente.
2. El esquema del circuito es el siguiente
La siguiente figura, muestra el diseño de las pistas que se deben dibujar en la placa de
circuito impreso. Observe las medidas de cada uno de los componentes y dibujela “TAL CUAL”
sale en la figura.
La siguiente figura. Muestra la disposición que deberán tener los dispositivos al
soldarlos. Cada dispositivo deberá ser colocado en la cara de acrílico de la placa y soldarlos en
las pistas de cobre
3. La siguiente figura, muestra la disposición de los terminales del transistor 2N3904 con su
respectivo símbolo
Lista de materiales
1 CILM556
1 Transistor NPN 2N3904
2 Cond. Cerámico 0,01 µF
1 Cond. Electrolítico 470 µF
1 Cond. Electrolítico 100 µF
1 Cond. Electrolítico 1000 µF
1 Resistencia 220 Ω
1 Resistencia 4,7 KΩ
1 Resistencia 2,2 KΩ
1 Resistencia 10 KΩ
1 Resistencia 100 KΩ
1 Conector Pila 9 Vcc
1 Parlante 8Ω 0,5 Watt
1 Switch ON/OFF
1 Placa 7 x 10 cm
