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 2n3904. Show all posts
Showing posts with label 2n3904. Show all posts
14 Apr 2014

Simple audio filter designs

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The PY2OHH pages contain a useful link to a TI paper on active filters. In my experience, virtually any audio or RF transistor (e.g. 2N3904...
27 Jul 2012

The Lesser Chirpy 10m CW transceiver

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SPRAT 151 had my article on Chirpy, an ultra-simple, very basic crystal controlled CW transceiver for 28MHz. This does work and has even man...
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Roger G3XBM
Burwell, Cambridge, United Kingdom
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