delabs Circuits

Thursday, November 13, 2014

Types of Switches in Electronics

Switches are electromechanical devices. The are used to control the path of current or energy flow. Power switches are used to turn on and off loads. The contacts should be robust and have immunity to sparking and corrosion. Switches for signals need to be gold plated for low contact resistance and within a sealed enclosure.

Types of Switches in Electronics

A Neon bulb should have a resistor is series to make a Neon Lamp. All specs in designer viewpoint.

Switch contacts and fuse contacts can spark badly and cause fire hazards, periodic examination, service and replacement may be necessary. The sparking also causes spikes, emi, along with inductors or coils or even long wires that are wound up in the path of current. This effect damages smps and electronic systems in its path, if not adequately protected.

The low signal switches do not have the above problem. Then.. switches that need to control microamps of current and battery contacts of portable electronics that consume micro power have a unique problem. A thin oxide layer on the contacts or thermometric emfs due to electroplating defects can cause bizarre effects. These contacts must be immune form the environment, sealed, gold plated and clean. Even a little ammonia gets close to the contacts could cause problems in signal and power switches.

Water, sunlight, corrosive fluids and exposed or heating electromechanical contacts  in connectors and switches are a designer and service engineering challenge.

Thursday, November 06, 2014

Aaron Cake Electronics

Aaron Cake  has many electronic circuits and other electronics information in his archive that is online since the 90s. Antique electronics and Parallel Port Programming.

Aaron Cake Electronics

Aaron Cake Electronics

The Schematic Symbol Reference, How To Solder and Desolder helped many electronic beginners in building their Projects. This was a valuable resource in those days even though it appears common today. The internet was used to genuinely share useful learning and ideas.

Tuesday, November 04, 2014

Circuit Land - Tony Van Roon

Tony van Roon VA3AVR has built Circuit Land. This site is as old as the html web internet, means 1995. Earlier it was a part of a Canadian University Site, when i discovered it in late niceties..

Schematics, Hobby Projects, Tesla, Marconi, 555, Metal Detecting, Electronics-Tutorials and a lot more..

Circuit Land - Tony Van Roon

Circuit Land - Tony Van Roon

Highlights -
  • Morse Code Practice Keyer,
  • Constant Current Charger
  • Touch Activated Alarm System
  • Miniature FM Transmitter
  • Continuity Tester, Smart
Tutorials on Photosensitive Devices, Transistor Tutorial, 12 parts, Opamp and Digital Tutors. Compeonet Testing Methods. Basics of Batter Charging, LEDs and Relays too.

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