Field strength meter (CB7358E)

This tuned circuit was found in a 1966 Electronic Circuit Handbook. The transistor can be any modern general-purpose equivalent.

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Sound Experimentation System (CB4194E)
This circuit allows the use of headphones and microphones with diverse characteristics in audio...
Very low frequency pass filter (CB5200E)
This filter lets a range of 0.1 to 10 Hz pass. We find it in a 1980s documentation, but it can be...
Superheteredyne MW Receiver (CB962E)
This circuit, found in a 1958 magazine, is for reference only, since the components are not easy...