Wednesday, November 09, 2011

JJS Electronics - EMS and CEM Company

A company based in UK and Czech Republic, which offers a full range of proven, high quality PCB, cable, system, rack and non-electronics based precision electro-mechanical assembly and test services.

JJS Electronics - EMS and CEM Company

JJS Electronics - EMS and CEM Company
"JJS Electronics has a broad contract manufacturing offering rarely seen at other EMS companies, including 'Tier 1's. With our unique mix of electronics, electrical, mechatronics (complex electro-mechanical machine assembly) and top-end configure-to-order assembly/integration services.."

EMS is Electronics Manufacturing Services
CEM is Contract Electronics Manufacturing

JJS Electronics Ltd.,

Wycliffe Industrial Park, Leicester Road, Lutterworth, Leicestershire,
LE17 4HG, United Kingdom

JJS Electronics Sro, Pražská 585, Chomutov, 43001, Česká republika

LM335 Cold Junction Compensation

Temperature Sensors like Thermocouples need cold junction compensation as a part of front end signal conditioning, this is done at the terminal block where the Thermocouple wires are terminated. This design has to be more accurate and broad, if the design we make has to work well in both Tropical and Temperate Climate Zones.

LM335 Cold Junction Compensation

Another Method using a Copper Resistor

If wires of two dissimilar metals are joined at both the ends and the junction formed at one of the ends, is heated more than the other junction, a current flows in the circuit due to Seebeck thermal emf. This effect is used in thermocouple temperature sensors.

The Peltier effect is the converse of above Seebeck effect, which means that if a current is forced through junctions of dissimilar metals, the junction will generate heat or absorb heat (cooling) depending on direction of the applied emf. This effect is used to make portable and small refrigerators. Thermocouple Temperature DPM - DMM

Thermocouple Temperature DPM - DMM

Tuesday, November 08, 2011

The Control of engineering systems

Lab Experiments using A/D and D/A cards. PC Interface. Using Matlab, Learning PID control. DC Motor control. Hovercraft project with PWM and Fans as Actuator of control system, Uses NIDAQ Interface.

The Control of engineering systems

PID Controller Design

"We used a 3-stage fuzzy logic PID to control our system. The kp, ki and kd values were changed depending on the current status of the error signal. For error values above a certain percentage of the desired output (in our case it was 30%) we used a large kp constant to drive the system as hard initially to get up towards the desired final value as quickly as possible...."

Position on a DC Servo Motor

Position on a DC Servo Motor

From - SCCS - Swarthmore College Computer Society

delabs pages on control systems - Industrial Process Control Circuits

Monday, November 07, 2011

Industrial Automation and SCADA

Industrial Automation INSIDER - UK's. Newsletter covers industrial measurement and control systems users and suppliers. Industrial Automation and SCADA

Keeps you abreast with the Technologies related to Industrial Automation and Process Control.

Industrial Automation INSIDER Homepage

"Now in its fourteenth year of publication, Industrial Automation INSIDER (formerly SCADA Insider) is the UK's only independent subscription newsletter providing industrial measurement and control systems users and suppliers with a monthly update on the continuing evolution and convergence of systems technologies."

CMOS Linear Applications – Fairchild Semiconductor

Careful study of CMOS characteristics show that CMOS devices used in a system design can be used for linear building blocks as well as digital blocks.

Utilization of these new devices will decrease package count and reduce supply requirements. The circuit designer now can do both digital and linear designs with the same type of device.

CMOS Linear Applications – Fairchild Semiconductor

CMOS Linear Applications AN-88

CMOS inverters can be paralleled for increased power to drive higher current loads. Loads of 5.0 mA per inverter can be expected under AC conditions.

PNP and NPN bipolar transistors have been used for many years in “complementary” type of amplifier circuits. Now, with the arrival of CMOS technology, complementary P-channel/N-channel MOS transistors are available in monolithic form.

From - Fairchild Semiconductor

Friday, November 04, 2011

Wireless Networking Resources

"Wireless Connectivity is very important for portable electronic devices. The technology has developed so well that small batteries, small flash storage and low power wireless is practical today. This makes Tablets and Wearable computer even closer to becoming the way computing will be done in the future.

The only bottleneck is that the mobile broadband still cannot manage that kind of data load at an affordable price. Something like the WiMax or Bell Labs' lightRadio Cube should take off and remove this Road Block.

We are now waiting for that Historic Invention that makes fiber-broadband and mobile-broadband converge to make the Digitally Connected World a Reality". - Aug 2014 Ananth delabs

Ben Gross - Wireless Networking  - Wireless Networking , Wireless VOIP. Resources related to Wireless Computing Networks.

Wireless Networking Resources

Wireless LAN Association - Non-profit consortium of wireless networking vendors established to educate the market place about wireless networking products, trends and applications..

Broadband Wireless Exchange Magazine -  is the largest web site in the world dedicated to the broadband wireless industry, is an online publication that publishes news and many reference materials.

WirelessDevNet - Wireless Developer - The Wireless Developer Network is an on-line community for information technology professionals interested in mobile computing and communications. Online tutorials and resources and Wireless Industry training courses and events The WDN Library - Look for numerous technical papers and education mWirelessDevNet

IEEE WCET - Wireless Communications - "The IEEE WCET certification shows that the individual has demonstrated mastery of the internationally recognized body of wireless communication knowledge..."

Thursday, November 03, 2011

Open Source Hardware - OSHW Draft Definition

OSHW Draft Definition 0.3 is based on the Open Source Definition for Open Source Software and draft OSHW definition 0.2, further incorporating ideas from the TAPR Open Hardware License.

Open Source Hardware - OSHW Draft Definition

Open Source Hardware (OSHW) is a term for tangible artifacts - machines, devices, or other physical things - whose design has been released to the public in such a way that anyone can make, modify, distribute, and use those things.

Open Source Hardware - OSHW Draft Definition

Open source hardware is hardware whose design is made publicly available so that anyone can study, modify, distribute, make, and sell the design or hardware based on that design. The hardware's source, the design from which it is made, is available in the preferred format for making modifications to it. Ideally, open source hardware uses readily-available components and materials, standard processes, open infrastructure, unrestricted content, and open-source design tools to maximize the ability of individuals to make and use hardware.

Adapteva’s Andreas Olofsson at OHS.

Adapteva - Andreas Olofsson at OHS

Making parallel computing easy to use has been described as “a problem as hard as any that computer science has faced”. With such big challenges ahead, we need to make sure that every programmer has access to cheap and open parallel hardware and development tools.

Open source hardware gives people the freedom to control their technology while sharing knowledge and encouraging commerce through the open exchange of designs.

Open Source Hardware

Open Source Hardware Association
P.O. Box 4743 Boulder, CO 80306

Wednesday, November 02, 2011

Process Automation Usability Project

Process Automation Usability Project Process Automation Usability Project

"The Process Automation Usability Project - a series of forums dedicated to simplifying and streamlining the application and use of process automation technology"

Interface on @UsabilityProj

From -@ControlGlobal

The Wireless Telecommunications Bureau - WTB

Wireless communications services include cellular telephone, paging, personal communications services, and other commercial and private radio services. The Wireless Telecommunications Bureau (WTB) handles all FCC domestic wireless telecommunications programs and policies with some exceptions.

Wireless Telecommunications FCC

Cellular and PCS phones, pagers and two-way radios, radio spectrum.

Federal Communications Commission - FCC

"The FCC was established by the Communications Act of 1934 and is charged with regulating interstate and international communications by radio, television, wire, satellite and cable. (United States). "

Geographic Information Systems - FCC

Geographic Information Systems - FCC

"With these data sets, you will be able to determine the locations and limited technical details of existing towers the FCC collects data on (i.e. Cellular, Paging, Microwave, AM, FM, etc...). This information can be extremely helpful in conducting analysis such as; current service deployment, need/feasibility determinations of new services, co-location of antenna structures, inventorying of structures, network planning, etc..."