A beauty of a crystal radio
This past weekend during Hammeeting – the largest Ham rally in Norway – I met Per LA9DTA.
He showed me his beautiful crystal radio. It can be seen in the center of the table, with some close-ups below. The design has a printed coil and the whole design is made on a PCB which was shaped as shown in the image. It has a bandswitch and a Ge diode.
I fell for his design, but with the lack of longwave and medium wave transmitters here I am not sure if I would have much use for it. That is unless I set up one of my transmitter projects to support a radio like this.
Cool concept on the xtal radio – this would be really neat for a kit looks like it would be around 20 bucks in parts and pc board ( that would be the most cost of the items ) but this is really cool
wish there was some more close up of the pics of this thing
Use a piece of PVC pipe for the coil form. Tuning caps and other stuff on line. There are a couple of web sites dedicated to xtal radios. Biased Shotky diodes make really good detectors. Also, look into matching xformers, so you don’t have to use a piezo headphone. Tap the diode down on the coil to get a better Z match.
73 /paul W3FIS