QRP Projects
DIY Inline RF Power & VSWR Meter
This Arduino Inline Power and VSWR meter is a valuable tool for the antenna builder and transmitter testing.
https://sites.google.com/view/kn9b/digital-swr-meter
QRP Home brew site http://www.n6qw.com
Audio Amp w/AGC - replaces LM386: /data/_uploaded/file/Audio_Amp_with_AGC.pdf