Transistorized multimeter (CB7355E)

This circuit is from a 1967 Triplett manual. The circuit uses components of the time, the common FET and the general-purpose bipolar transistor.

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Proximity Detector (CB11566E)
This circuit is from a 1965 Argentine publication (Radio Chassis Television). The original...
Solar activity detector (CB23584E)
Very rapid brightness changes or flares that occur on the sun can be detected with this circuit that...
High Pass Filter II (CB19679E)
The components of this filter are calculated using conventional formulas (see mathematics section of...