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Wednesday, July 03, 2019

Inverting Amplifier - Op-Amp Designs

This is an Op-Amp Tutorial. Here you see an Operational Amplifier in the Inverting Amp configuration. I have used OP07 as it is almost like an ideal Opamp. The ultra low offset is the best part. Then not really, CA3140 has a Tera Ohm Input resistance but offset not the best. ICL7650 approaches an Ideal Op-Amp and chopper stabilized.

Inverting Amplifier - Op-Amp Designs

These parameters are good for DC Amps. Sensors, Strain Gauge Bridges Signal Conditioning need them. Then when you want a better AC performance, you can use a LF353 with a nice slew rate. Here the DC merits are not of much use.

Inverting Amplifier - Op-Amp Circuits

Input Impedance of this module is Ri as pin 2 is at virtual ground, the opamp with feedback tries to maintain pin 2 and 3 at same potential pin 3 is at 0V hence pin 2 is at virtual ground. Clamping diodes protect OpAmp, Rf + Ri is between 5kE and 1ME as an opamp may be able to drive around say 5mA max


Monday, July 01, 2019

Widgets from delabs

There are Web widgets related to learning electronics and also demonstrating the subtle aspects of Product Design Technologies. This blog also has the widgets made by delabs from the iGoogle days, around 2005. These demonstrate solutions for improving usability in devices.

EE Widgets of delabs - Here i am moving traditional html pages content into an expression-engine cms in the multi-site mode. In this site i have managed to give it a skin with images using an incremental css file. The old Site which has moved many times is here dapj gadgets.

Widgets from delabs

After Google Plus service ended, i am reducing the dependence on external services. I have also removed these projects from github, the code i created more than a decade ago is outdated now. It is also better we depend on ourselves and open-source projects.

Small and Big Bizness

If you are a small company you have an ability to grow and improve as adrenaline is working. Many large companies due to inertia lose their core skills; because they become complacent. They shrug off customers and responsibilities. They soon become careless and slovenly, Then they start stepping on others toes.

Small and Big Bizness

Soon they seem to only struggle to maintain their virtual positions by various adjustments. Later corruption and red tape sets in. The small company remains agile, attentive and proactive and slowly gets better market share, but they have the disadvantage of cash flow and contacts.

The conclusion is big and small both are at par. The Big ones have to consolidate, reform, hive off and be sensible. The Small ones has to be ever look out for opportunities left open. There are good sensible big corporations who know this, they work with a sense of social responsibility, try to become like them, for they know the secret to be big and agile.

Necessity is the Mother of Invention. Fortuity is the Father of Innovation.

- delabs 2002

Wednesday, June 12, 2019

Hitachi - Engineering and Technologies

Hitachi is a highly diversified company with products and solutions in High Functional Materials & Components, Power Systems, Electronic Systems & Equipment, Automotive Systems, Digital Media...

Hitachi - Engineering and Technologies

Hitachi was founded in 1910 by electrical engineer Namihei Odaira. The company's first product was Japan's first 5-horsepower electric induction motor, initially developed for use in copper mining. Odaira's company soon became the domestic leader in electric motors and electric power industry infrastructure

Hitachi J100 adjustable and Variable frequency drive

Hitachi J100 adjustable and Variable frequency drive. Photographed by C J Cowie

Hitachi at Wikipedia 

Hitachi has contributed immensely to semiconductor and electronic manufacturing technologies.
  • 1958 Completed six-transistor miniature portable radio
  • 1959 Completed electronic computers based on transistors
  • 1966 Developed LTP processing technique for silicon transistors
  • 1978 Experimental color camera with solid-state miniature image device developed
Hitachi History

1976 Hitachi portable VTR, for Sony 1" type C; the source and take-up reels are stacked for compactness.

HITACHI 1 Zoll-C-Maschine - Video tape recorder

HITACHI 1 Zoll-C-Maschine - Video tape recorder

Monday, June 03, 2019

Intersil Hot Ideas 1983 Mixed CMOS Revolution

These helped me build Intelligent Instruments in the 80s. Intersil was with GE earlier, innovators of   advanced CMOS before anybody else. They made the smartest chips when the Microprocessors were being examined Skeptically by engineers. (At that time Microprocessors needed many support chips and consumed huge power only later CMOS uC came).

Intersil Hot Ideas - 1983

Intersil Hot Ideas - 1983

Today i found out that another company of that time called Datel is back, it was first a part of GE like Intersil then went to Murata now after decades it is back home.

"Datel was established in 1970 and has been a long time leader in providing high precision data acquisition components, including data converters, power supplies, DC-DC converters, and digital panel meters. "