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.

Wednesday, June 16, 2010

OPC-478 Cloning Cable

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Another evening project is this OPC-478 cloning cable for my Icom IC-2200H. Credit is given to Icom which the original circuit ...

Thursday, May 20, 2010

Solid State Relay (SSR) using MOC3020

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The circuit uses the MOC3020 optocoupler that drives the triac to switch 220V of AC volt to a load. We have this project after one o...

1 comment:

Friday, April 2, 2010

Transmit Beacon for Hand-held Radio

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The circuit is run by 555 timer IC for its PTT sequence that is 4 seconds "on" and 4 seconds "off". Transmission...

3 comments:

Thursday, January 28, 2010

Server Interface Set-up

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Here is a sample interface unit configured as a server. At the left of the interface is an IC-T2H portable transceiver where the interface...

Sunday, December 20, 2009

The Result of the Regular Examination Held at NTC Batangas

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The exam was held last October 3, 2009 at NTC Batangas. I took the exam for my upgrade (Class B license). Thanks to 4F1DY(Jyrus) of DX1CW wh...

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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 ...

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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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