First pulse preserver (CB9259E)

This circuit was found in a 1967 EEE. The components are from that time, but the circuit can be implemented with modern equivalent components.

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Two Transistors Amplifier (CB918E)
We found this two stage transistor amplifier circuit using RC coupling in a magazine published in...
VHF to FM Converter (CB16826E)
With this circuit it is possible to receive VHF stations up to 100 MHz on a common FM receiver tuned...
Field strength meter (CB8220E)
This passive tuned circuit was found in a 90s Popular Electronics. The coils must be according to the...