Merry Christmas & Happy New Year 2009
I'd like to take this time to wish all of you a very Merry Christmas.
This is a season of giving, peace, understanding and goodwill among all. I hope that this Christmas will find you among friends and family with good food, good times, and good memories. And I hope too that Santa lines the bottom of your Christmas tree with all the Amateur Radio goodies that it can hold!
Wish you a very happy new year, many nice DX contacts, a lot of pleasure with our hobby and see You in 2009 again!
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AF power amplifier with TDA2003 |
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The audio from some older radios seems to be distorted. Older IC’s have also problems with an amplification for headphones (low-level output). A noticeble improvement is an AF power amplifier with TDA2003. The power output is around 3W on 4/8 ohm speaker, clear frequency response 300 – 3000 Hz and the amplifier is independent on the supply voltage.
The circuit has an improved stability by Bucherot cell (0,47uF a 1 ohm). There could be added some blocking capacitors e.g.10nF + 100uF. The metalic part of IC is connected to the ground.
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