Search This Blog

Tuesday, February 10, 2015

Basic Digital Electronics Tutors

These Digital Tutors are interactive and started with very basic JavaScript and CSS. You can operate the controls and see the Truth Table and Results in LED Displays. Controls include DIP Switches and Push Buttons.

Tutorials on Digital Electronics

Digital Electronics Interactive Tutors

In Electronics Theory Section


Here is a Snapshot of a Live iGoogle Page showing a Digital Preset counter Gadget in Canvas view.
Other Gadgets are Logic Gates Tutor and Digital Timer

Sunday, February 08, 2015

Muntzing a Circuit Design

A History of TV is not Complete till you Learn about the Adventures of Earl Muntz. How he cut cost to Promote his TV Sets by Incremental Pruning of Parts from a Working unit.

Adventures of Earl Muntz and his TV

What is important to learn from it though, is that we should not overdesign or underdesign. We need to design a cost effective product within customer budget. More Bells and Whistles in yet another Model. A Model to cater to every Purse. And a BareBones model for those who just can barely afford it.

History of Muntzing

Muntz Story

"He took a trip to New York City, checked into the Warwick Hotel and ordered three television sets delivered to his room: an RCA, a Philco and a Dumont. He turned all three televisions to the same channel and began pulling tubes from each one by one. When he pulled one tube too many from a set and the picture went black, he would make a note. Then, he put all the tubes back, changed the channel to another of the four television stations operating in New York City and repeated the test."

Tuesday, February 03, 2015

Types of Prototype Boards for Breadboard Testing

Tag Board or Terminal Strips were the first General Purpose Boards for Electronic Prototyping. This was also the way some modules in Valve Radios and Early Televisions were manufactured. The Turret Board that still remains in use can be seen as an example of  Point to Point Wiring.

Turret Board

These are useful to place Heating Parts, High Voltage or High Energy Circuits and Sometimes RF Assemblies too.

BreadBoard - Is also a word to indicate the Prototyping Work or Act.

This is a reusable gadget like a connector, works like an IC base, only that the connectors in this are very long lasting. 

You can just plug in the components and connect using thick pre-tinned single strand wire. Big pins can ruin the sockets and powercircuits. Levels > 200mA or > 24V could be avoided on these boards.

Types of Prototype Boards for Breadboard Testing

General Purpose PCB - Perfboard, Stripboard, Veroboard.

This is a PCB  known as  "General Purpose Prototyping Board".  They have to be soldered and some tracks cut with tool-knife. Power circuits also can be built with wire reinforcements and RF circuits too if you plan the layout first on paper. The one with the "Breadboard" layout with a Power bus is most popular. Some for IC circuits are also available,

Wire Wrapping

This is way Custom Equipment, Systems and Advanced Boards are made. When a customer orders a system, just one of a kind. This can be used to prototype and even manufacture a couple of systems.

Extended Eurocard Intergrated Circuit development card

When you are creating a 19" Eurocard Rackmount Solution, say a big Data Acquisition System or a ATE an Automatic Test Equipment. You could use these type of cards.

Eurocard and Plugin Board from Vero

Integrated Circuit Development Plug In Board

Plug-in Veroboard - This board combines the unique Veroboard pattern with the 37 way 2,54mm pitch direct edge connector. Intended primarily for hard wiring of discrete components it is equally useful where a number of common bus or signal lines are required.

Hobby DIY Garage