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 mains hum. Show all posts

Showing posts with label mains hum. Show all posts

7 Feb 2012

Free power radios

KE3IJ 's always excellent website has a novel receiver circuit that derives its DC power from AC mains hum and noise it picks up on its...

5 May 2011

Ultra low voltage oscillators

Thinking a bit more about my crazy idea for a mains hum powered QPRp beacon TX, I chanced upon this page which discusses FETs running from e...

27 Apr 2011

Mains hum powered beacon

Recent tests with earth electrodes at VLF have got me wondering about a simple QRSS HF/VHF beacon TX powered entirely from the rectified ma...

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Roger G3XBM: Burwell, Cambridge, United Kingdom

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