Not satisfied with the 2D2S noise source frequency limit and flatness, I designed a better tube mount. This works very well, being flat within ca. +/-0.2dB up to 200MHz instead of 50MHz, having better matching and better shielding, too.
Click here too see a Tube Noise Source using the 2D2S Tube (Updated) …
Trying to make RF switches that do not “spike” (i.e., injecting switching pulses into the RF sigtnal), I created a transformer based PIN diode switch that can also be used as a mixer or modulator. Spikes are gone, but there are some other areas to get rid of.
Click here to see some info about RF Switches …
The next little project I wanted to make was an SWR sensor to protect power amplifiers. I chose the Bruene Bridge circuit because of frequency range and quite good accuracy.
Click here to see some SWR Bridges …
Electronic Projects for Fun 