VHF radio contest tomorrow between 1pm and 3pm UTC! For FT8 and FM voice on 2 metres.
The most popular tech gadget from the year you were born: 1950-2004 https://www.insider.com/most-popular-tech-gadget-year-you-were-born#motorola-released-the-first-mobile-phone-in-1973-as-seen-in-this-photo-they-were-far-clunkier-than-todays-models-20
This is something I wanted to see for a long time, a massive church organ connected to a midi controller: https://www.youtube.com/watch?v=SQHdFAm7g7E
Measured the inductor I made last night, which has an inductance of 0.24mH. Coupled with the variable capacitor which has a capacitance range of about 30-420pF, this will allow me to tune from 500kHz to about 1800kHz, easily converting the entire medium wave band.
Winding an inductor for one of these variable capacitors. Combined, they'll form a tuned circuit that will resonate at a radio frequency which can be adjusted by turning the knob on the capacitor. I'll block out part of that radio signal by adding a diode: this will allow only the positive part of the electrical current through. Then, I'll connect the diode to an earphone. Finally, I'll attach an antenna and a grounding connection to the tuned circuit and, lo and behold, I'll have a radio.