Thursday, March 30, 2006

Resistors and How they Work

Resistors start from Wires to Wirewound Types. Carbon Film Resistors are most Common, Metal Film Resistors are more stable and accurate. We have now SMD types with lower power some are Laser Trimmed Types for accurate values. Resistors Arrays are used in Digital Circuits.

Types of Resistors - Color code and Other Resources

1/4 W Resistors have a Voltage rating of around 200-250V. Even when using a High value like 1 Meg use two in series when it is across Mains 230 V AC. 470K + 470K - you get around a Meg at 500V
Rating.

Resistors and How they Work

Resistor 1/4W Metal Film
A standard range of 1/4W Metal Film Resistors suitable for most applications. High stability and solid construction ensure a long and stable life. 1% tolerance for the full range from 1R to 10M.

Riedon Resistors - Wirewound, Thick & Thin Film, and also Foil resistive elements.current sense, high pulse, high surge, surface mount, power and precision wirewound resistors.

High Performance Resistor Networks from Caddock - precision resistors, high voltage resistors, current sense resistors, chip resistors, high frequency resistors, and load resistors.

Ohmite’s Audio Gold resistors have been carefully engineered with non-magnetic materials to eliminate the effects of these stray magnetic fields on circuit performance. Ohmite’s LVC Series low value chip resistors are ideal for today’s current sense applications requiring low profile, low cost solutions

Coils and Transformers for SMPS

In Switching Power supplies and RF Circuits, the coils and transformers have many types of cores. Ferrites, Powder Iron, Air and others. These are much smaller and lighter for the same power that they deliver, in comparison to the 50/60 Hz Mains Transformers or chokes.

Coils and Transformers for SMPS

CWS - Applications

This section contains useful Application Notes and "How To Use" help to assist engineers better understand various applications of Power Inductors, Common Mode Chokes, Current Transformers, Power Transformers and Ferrites for EMI suppression etc.

Coilcraft - Design Support Tools

Power Magnetics tools, RF Inductor tools, Common Mode Choke Finder, LC Filter Design tool, IC / Inductor Matching tools.

Power Transformer Inductor

In general, ideal SMPS transformers need to transfer all energy instantaneously from one winding to another while storing no or little energy in the process.

Mains Transformers Types

Low Frequency Power Transformers are used to step down mains voltage of 230V or 110V to safer voltages like 12V and 6V. The core is made of laminations of a Conditioned Alloy of Iron. The windings are Enameled or Insulated Copper Wire. They provide both Isolation and Safety while Scaling the Voltage and Power.

Mains Voltage Power Transformers

Mains Transformers Types

Transformers Made by Hammond Manufacturing

Contents

Basic Electronics
Basics of Electronics
Product Production
Work Discipline
Testing Points
Learning Electronics
Electronics Theory

Production Notes
Prototype Fabrication
Electrical Circuits
Electromechanical


Library
Scots Guide Electronics
Engineering - Wikibooks
Design Lab - Jim Svoboda
DC Circuits UOG
Socratic Electronics
Blobz Guide Electric Circuits


Product Design
Product Development
Constant Current Source
Good Voltage Regulators
Insulation Resistance
Digital Insulation Tester
DN Schematic PCB 04
DN Product Design 07


Hobby Circuits
VU Meter Circuits
LED brightness control
555 Incredible Chip
Process Control
liquid level measurement
Thermocouples and RTD
Design ADC Interface uC
Thermocouple Amplifier
IA Instrumentation 02
Temperature on DMM
Optical Proximity Switch
Analog Mux - Data Acquisition


Test Measurement
Instrumentation Automation
NI Test and Measurement
DMM Digital Multi Meter
Oscilloscope in T&M
IA Automation 01
Build Instruments
Tektronix T&M Equipment
Educators Corner – Agilent


Power Electronics
UPS Background
Transformer Connections
DN Power Electronics 03
DN Power Electronics 02
Half Bridge Convertor SG3525


Embedded
Interfacing Microcontrollers
Embedded Process Control
80C31 8052 Microcontroller
Microprocessors and uC
Embedded Systems Design

Components
Good Voltage Regulators
Relays and Contactors
Potentiometers Trimpots
Prototype Boards Types
Types of Capacitors
Types of Switches
Resistors How they Work
Coils Transformers SMPS
Mains Transformers Types
DN Components Selection 05

Tutor Gadgets
Count-Up Timer
Digital Logic Gates
Electronics Tutors

History
Teaching Instruments
Charles Proteus Steinmetz
Muntzing a Circuit Design
Teralab Electronics projects
Historical Instruments


Tables, Charts, Videos
Binary and Hex
Resistor Color Code
Ohms Law
Giga, Tera, Pico, Nano
High Resistance Materials

Analog
School - Analog Design
DN Analog Basics 06
DN Op-Amps 01
TI Semiconductors