Sunday, January 08, 2017

Relative Humidity Table for Hygrometer

Wet bulb and Dry bulb Digital Humidity Meters or Hygrometers are accompanied with a chart for evaluating % RH. This chart is in PDF format below.

Table of Relative Humidity or RH 370 Kb PDF

The Sensors that could be used are Two RTD PT-100 and Two 48*96 Digital Indicators. The Wet bulb had a Moist Wick Compartment where water has to be refilled periodically.

Here are some Traditional Hygrometers. Even today these are used and work very well. Humidity and Temperature control is also important for HVAC - Heating, ventilation and air conditioning (HVAC).

Relative Humidity Table for Hygrometer

When Weaving Textiles, Humidifiers or Atomizers are used to maintain the Humidity of the Work Area where the Looms are running. A Horse Hair Hygrometer is used to Manually Monitor and Regulate the Humidity. In Offices where the Air Conditioning needs a Humidity regulation the method used to Determine Humidity is by using a Wet and Dry Bulb Hygrometer or a Sling Psychrometer. Human and Animal Health is also sensitive to these parameters.

Related Resources -

Tuesday, January 03, 2017

Smithsonian - The Chip Collection

The National Museum of American History's Chip Collection consists of individual donations of objects, images and documenation that traces the history of integrated circuits.

Smithsonian - The Chip Collection

The Chip Collection is a continuing work-in-progress concerning a small part of the permanent collection of the Division of Information Technology & Society's Electricity Collections.

ICE, originally located in Phoenix & Scottsdale, Arizona, was purchased after ICE's 30-year collection had been donated & accessioned by the National Museum of American History at the Smithsonian Institution.

Smithsonian - The Chip Collection

Pictures
This site's refrence pictures, diagrams, x-rays, thumbnail selections, and in some cases actual logbook pages in a single category to make your research faster.

Chip Fun
An important though unusual aspect of the history of integrated circuit technology is buried deep inside many chips, we call this chip art.

Sunday, January 01, 2017

Museum Of Electricity - Charles Brush

Yes, there were electric lights powered by central stations before Edison's! Carbon arc lamps saw extensive use throughout the USA and the world from the late 1870s on. - Charles Brush

Museum Of Electricity - Charles Brush

The General Electric Company was formed in 1892. It was the result of a meger between the Edison General electric Company and the Thomson-Houston Company, which themselves incorporated several other companies.

Museum Of Electricity - Charles Brush

Electricity, technology, and lots of arcs and sparks!

Museum Of Electricity contains Vintage Electrical and Historical images and description. They include the Edison Lamp, Tesla Coils, Lightning and Atmospheric Electricity and the .....

Amazing Jacob's Ladder

So how do they work?  First two conductive metal rods are positioned in a rough “V” shape with a slight space between them at the base.  A sufficient voltage differential is provided from a high voltage transformer to breakdown the air in the gap between the rods.

Saturday, November 12, 2016

Active Filter Design with OpAmps

This is yet another Application Note of Exar found in- "Applications Data Book" June 1981. The Seven Scanned Pages as attachments can be viewed and studied at …

The availability of low cost dual or quad operational amplifier IC's have made the operational amplifier based active filter techniques cost effective over conventional passive filters. The recent availability of programmable quad operational amplifiers such as the XR-4202 or the XR-346 have provided the active filter designer with the flexibility to externally program gain-bandwidth product, supply current, input bias current, input offset current, input noise and the slew rate.

Application Note - AN-03 - Active Filter Design with IC Op-Amps

Active Filter Design with OpAmps

This application note is intended to familiarize the filter designer with the fundamentals of active filter design, using monolithic IC op amps. It presents a table of transfer functions and network equations for high-pass, low-pass, band-pass and band-reject filters. Several design examples are given to illustrate the respective merits and limitations of various filter configurations. Particular emphasis is given to applications of programmable quad operational amplifiers, such as the XR-4202, as an active filter element in FSK Modems.

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