Channel were among the first applications for electrical circuits and have lost none of its fascination. Even if the operation is subject to strict conditions, is a look at various circuits and concepts are often very instructive

Here you will find Schematic Circuit Diagram for DIY and further information on High frequency
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Interesting site of Harry Lythall with several projects, some with layout	web.telia.com/~u85920178/
Roehrensender with the technology of 1920 Historically very interesting!	www.antiquewireless.org/otb/1920xmtr.htm
Mini Spy FM transmitter for in-Hartley Technology	www.electronics-lab.com/projects/rf/002/index.html