Monday, April 15, 2013

Colour Television Trouble Shooting


Colour Television
1
Introduction
Historical Background
Colour television was first introduced in the United States in the year 1953. The colour TV system adopted there was developed by the ‘National Television System Committee’ which was specially constituted for this purpose. This system is known as ‘NTSC System’.
A refinement of this system was developed in the federal republic of Germany by the Telefunken Laboratories. This system which is known as PAL (PAL standing for phase Alteration Line), was first introduced in the year 1967. This was adopted in the U.K., Federal Republic of Germany and a number of other European countries.


Tuesday, April 9, 2013

AM/FM Radio Circuit

AM/FM Radio Circuit Diagram
Printed Boad

මෙම පරිපථය මගින් AM/FM වැඩසටහන් වලට සවන් දිය හැකිය Printed Boad ඒකක සෑදීමෙන් ඉතා පැහැදිලිව වැඩසටහන් වලට සවන් දිය හැකිය


TDA 2004 Stereo Power Amplifier


TDA 2004 Stereo Power Amplifier Circuit
With Preamp & Tone Control Circuit


මෙම පරිපථය Printed Boad or Vero Boad ඒකක සකසා ගන්න. Control සදහා Screen Wire සවිකරන්න. IC  ඒකට හීට්සින්ක් ඒකක් සවිකිරීම කල යුතුය. 12V/3A පමණ Transformer යක් භාවිතා කරන්න.