MK Electronics & Robotics

The first transistor, The latest transistor

From November 17, 1947 to December 23, 1947, John Bardeen and Walter Brattain at AT&T's Bell Labs in the United States, performed experiments and observed that when two gold point contacts were applied to a crystal of germanium, a signal was produced with the output power greater than the input.[10] Solid State Physics Group leader William Shockley saw the potential in this, and over the next few months worked to greatly expand the knowledge of semiconductors. The term transistor was coined by John R. Pierce as a portmanteau of the term transresistance

THIS is a 7 segment counter circuit which counts from 0-9

This is a very useful circuit.we can test remotes of TV,DVD,Car-stereo,A/C etc .If the remote is working the led blinks(u can test with any key of the remote).U can place led of ur choice.This circuit cost RS 42/-
"Any doubt regarding this pls ask"