EMI-LPF Filter for the headsets or microphones

Hello everyone. Here is my another project for headsets or microphones. It’s an EMI-LPF filter.

EMI-LPF filter

EMI-LPF filter

It’s a complete and finish device which you can use to protect your microphone against the EMI. There is a simple circuit for the EMI filtering and also has a LPF (Low Pass Filter) which rejects all frequencies below 300 Hz.

You can make it or buy in my ebay store

Thanks.

73’s,
Alex K6VHF

Automatic Fan Controller Circuit

This circuit will turn on/off 12V DC fan or CPU fan when temperature above normal temperature.You can set turn on temperature by adjust VR1. This circuit use an NTC (Negative temperature coefficient)which is a thermistor is one in which the zero-power resistance decreases with an increase in temperature. So If temperature increate the voltage at pin 3 on LM311 will decreated .The resistance of NTC is about 10K at 25’c.

VR1 should be multi-turn potentiometer type such 10K/25 turn

Automatic Fan Controller Circuit

Automatic Fan Controller Circuit

73’s,
Alex K6VHF

2013 WW WPX RTTY contest results

Glad to inform that I’ve received the winning award for 2013 WW WPX RTTY.
Just another award for my collection. Thanks to everyone!

CQ WW WPX RTTY Contest 2013

CQ WW WPX RTTY Contest 2013

Here is some photos from that contest. Snow and cold…

Our cabin

Our cabin


HEX beam antenna on 15m band

HEX beam antenna on 15m band


FT-857D and working laptop

FT-857D and working laptop

The full photo gallery is here

73’s,
Alex K6VHF

Long pafh VU3WIJ calling CQ on 20m

That was amazing propagation on 20 m band. On video you can see that I use my mobile station and his signal is strong S9+.

QSL card VU3WIJ

QSL card VU3WIJ

CQ WW RTTY Contest 2013

1111Hello everyone. Here is some photos from CQ WW RTTY Contest which is my of of favorite contests. In this year my contest position was in Los Angeles area near Granada Hills. The place is good and quite. I was surprised because the propagation was so amazing and really low noise level on top bands. Me and friend of mine Alex W6AWW we installed our portable antennas in the garden around the pool. All antennas except HEX Beam were designed by me and are home made. I hope many people know the J-Pole antennas but only some of them used or still using those antennas. Based on my experience these antennas are useful and have many benefits. I’ve been made 4 antennas for 4 bands (6m, 10m, 15m and 20m). All of those antennas were tested in real field conditions during contests and CQ WW RTTY is one of them. Check our photos. Thanks. Your comments are welcome!

CQ WW RTTY CONTEST 2013

CQ WW RTTY CONTEST 2013

CQ WW RTTY CONTEST 2013

CQ WW RTTY CONTEST 2013

CQ WW RTTY CONTEST 2013

CQ WW RTTY CONTEST 2013

CQ WW RTTY CONTEST 2013

CQ WW RTTY CONTEST 2013

CQ WW RTTY CONTEST 2013

CQ WW RTTY CONTEST 2013