Tuned active antenna (CB8412E)

Found in a 90s Popular Electronics, this circuit allows to select the operating ranges between short waves and VHF. MOSFET is uncommon today.

| Clique na imagem para ampliar |

Unity Gain Second Order Filter (CB25596E)
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RF Amplifier (CB6129E)
This RF amplifier step has a dynamic range of 140 dB and can amplify signals from 0.5 to 40 MHz....
Wireless Rhythmic Light (CB12069E)
This project from a 1983 publication can be assembled using more modern transistors. We can use...