Author: Johnson Francis

There was a pass of International Space Station with about 37 degree maximum elevation in my region. I did not expect anyone as it is a noon pass

Yesterday, when I read about NPN transistor BC547B and the corresponding PNP transistor BC557B, I noted that the former had a typical transition frequency (fT) of 300 MHz

Bipolar junction transistors were the ones we started using long back for our hobby electronics projects. In those days we had PNP type of germanium transistors and NPN

I was quite happy to read the email from Félix EA4GQS, AMSAT EA, on the AMSAT bulletin board just now. He has mentioned that new HADES-R and HADES-ICM

Secure Argentinian Amsat Satellite Pass Prediction Page informed by Pedro  LU7ABF is: https://mail.amsat.org.ar/pass.htm

In the remote past I have had several instances of antennas coming down in the rainy season, which is also the windy season. Though the first part of

I connected a step down transformer to the input of an amplispeaker with a 50K cermet preset potentiometer to listen to the 50 Hz hum of alternating current.

Three pins of the cermet 50K preset potentiometer were placed on three rows on a solderless breadboard. Jumper wires were used to connect the terminals to a digital

Preset potentiometers are are variable resistors. The resistance value can be varied using a screwdriver to turn the screw mechanism on the device. Cermet is a combination of