Johnson's Techworld

Well, I had not heard of an upconverting superhet till I read about sBitx transceiver from VU2ESE. Usual superhets which I have heard of were downconverting superhets which

Many of you would have heard of Arduino, the popular microcontroller, especially those interested in hobby projects and those who are using the Arduino based µBITX QRP transceiver.

Today I had the opportunity to check in to a unique type of HF net, the BCDX Net on 7085 kHz. As I came a bit late to

My amplispeaker cum FM radio does not have a volume control. So it is hard to use it when a strong FM station is being heard. I thought

Here is a simple circuit with 74HC14 Hex Inverting Schmitt Trigger IC. Different values of capacitor can be tried to change the blinking rate of the LED. Though

As I did not have a regular FM radio, I thought of using an amplispeaker which could work as an FM radio if the mic with long cord

Every radio amateur should know about the basics of a radio transmitter, whether you are going to operate a commercial one or make one on your own, what

LignoSat developed by Kyoto University, Japan and the logging firm Sumitomo Forestry aimed at using wood for space exploration! Ligno stands for wood in Latin and you would

This week, every amateur radio satellite enthusiast is busy decoding and posting SSTV (Slow Scan TV) images from International Space Station. Now what is SSDV? SSDV is the

Yesterday, I had mentioned that I was quite happy when I came across a BD139 transistor in a voltage stabilizer brought back after repair. That was because I