LA3ZA Radio and Electronics

It's nice to see that my antenna article in Amatørradio no. 3  this year has inspired others. In no. 4, LA1AEA, Alfred, has written abou...

My Just good enough 10 MHz reference  based on the direct output of a Neo-7 GPS module, described in detail before on this blog, is good i...

Step-down converter based on LM2596. Note the damaged chip Ok, now I've done the test. My QRPLabs U3S runs off a 12 Volt power supp...

Powerpole voltage and current monitoring is quite nice to have. One can buy commercial meters, but due to the availability of nice and che...

My poor-man's 10 MHz reference based on the Ublox Neo-7M GPS module didn't always receive GPS satellites. Since I rely on receptio...

I had some trouble closing the lid on the " Just good enough 10 MHz GPS reference " due to the size of the BNC jack. Therefore I...

Some time ago I noticed that the Ublox Neo-7M GPS has a 10 MHz output which is locked to the GPS system's accuracy. Most people kept s...

Tonight I made the first successful decoding of WSPR on the 630 m band. What inspired me was all the talk on the Elecraft reflector on the...

Many places in the world, low power transmitters in the medium wave band are allowed. I am talking about regulations like in the US where ...

My own surface mount version of the Pixie2 Here's a guide  in table format to minimalistic single-band amateur radio transceivers. T...

"Improving the LM386 Audio Amplifier"  is the title of always inspiring Rev. George Dobbs G3RJV's column in this month...

We all want to package our electronics projects in some nice enclosure. An Altoids tin is often used - and I have used that a lot myself . ...

Here's a design for a 1 MHz amplitude modulated (AM) transmitter. I've been looking a while for something like this, a simple shor...

My single-lever PCB keyer. It may seem like a bad idea to downgrade from a dual-lever paddle and iambic keyer to a single-lever paddle....

Transceivers with a power supply of 1 and 2 Volts, how much can one achieve with that? Well, actually quite a lot according to DL2AVH, Hel...

When you measure the energy out of a GSM cell phone at the moment of initiating a call, you get the picture to the right. It shows the fir...

The useless machine or ultimate machine originates from Claude Shannon , the scientist who figured out how to find the channel capacity in...

My first beacon on 30 m, a free-running Ultimate QRSS kit (no GPS) has now been running for a full 24 hours using the Weak Signal Propaga...

Press image for magnification I like to build small electronics projects and like many others I have found the small Altoids tins to be...

In 2012 bulky power transformers that work directly from the power grid at 50/60 Hz have mostly disappeared. My objective here is to moder...