du1vss (D.I.Y.)

It's all about ham radio. Although some of my projects involved transmitters, rf amplifiers and antennas that operate outside the ham bands, these things are solely for educational purpose only and experimentation.

Tuesday, November 10, 2009

Microphone Preamplifier

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Another weekend project is this microphone preamplifier which came from my new book Hints and Kinks for the Amateur Radio. The amplif...

2 comments:

Monday, November 2, 2009

My Home made Morse Code Keyer and Oscillator

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Learning morse code is fun and exciting. At first, I don't see the importance of it thinking that this is just an obsolete form ...

Monday, July 27, 2009

My 24Amps 13.8V Modified Regulated Power Supply

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I just brought my new Steady-Volt 24Amps, 13.8Volts power supply that cost several thousand bucks at RadioCom somewhere there in Pasay. ...

8 comments:

Monday, June 8, 2009

Homebrew your 4:1 Coaxial Balun

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When the antenna has an input impedance of 300 ohms balanced line, the 4:1 coaxial balun easily transforms this to match with our 50 ohms un...

1 comment:

Sunday, November 23, 2008

The VHF J-pole antenna

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The J-pole antenna earned its name as one of the most popular VHF antenna because of its simplicity and its considerable gain when compared...

Thursday, September 11, 2008

Regulated 15 Amps. Power Supply

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This project is very simple to construct using cheap few components and easy circuit lay-out. Regulation of this project uses the fixed 3 te...

Thursday, August 21, 2008

3 Elements 2-Meter Yagi Antenna

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This antenna project uses another approach in feeding the driven element. Instead of using gamma-feed dipole as its driven element, it uses ...

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About Me

hevirred: Hello, I'm Vir, a ham radio operator with a callsign of DU1VSS. I hope you find this blog useful and interesting. Feel free to send me an email if you have questions about my project. Thank you and 73. hevirred@gmail.com

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