30 MHz preamplifier (CB9151E)

Found in a 73 magazine for radio amateurs of the 1980s, this circuit uses a dual-gate MOSFET. This component is not currently common.

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One Minute TTL Timer (CB1273E)
We found this configuration in an old 1970s American documentation. The circuit may use equivalent...
Bidirectional buffer (CB9317E)
This circuit was obtained in a 90s Electronic Design. The circuit uses components from that time....
Medium and Short Wave Tuner (CB19267E)
This circuit connected to the input of a good amplifier, with suitable coils can tune stations of medium...