PCBWay: $5 for 2 layer PCBs with 24hr turnaround at:https://www.pcbway.es/?from=Caesar space
The Galenatype radio or crystal radio made with common didos taken from recovered electronic boards, you will not be able to believe how well it works and does not require power, you can do it in the middle of the field without batteries or batteries or electricity from the line, no miss this video
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