Roger G3XBM's (Mainly) Amateur Radio Blog

Simple QRP projects, 10m, 8m, 6m, 4m, FT8, 160m, WSPR, LF/MF, sub-9kHz, nanowaves and other random stuff, some not related to amateur radio.

Showing posts with label earphone. Show all posts
Showing posts with label earphone. Show all posts
27 Jan 2012

How sensitive can headphones be?

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Having made several short-wave crystal sets in my time I have nearly always used the little "deaf aid" very high impedance cryst...
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Roger G3XBM
Burwell, Cambridge, United Kingdom
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