PCM switching (CB9403E)

Using a tunnel diode, this circuit was found in a 1966 American publication. The circuit is for signals sampled at a speed of 8,000 sps.

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Digital phase meter (CB7374E)
Found in an Electronic Design from the 90s, this circuit measures the phase difference between two...
Operational Amplifiers Test (CB1500E )
We found this circuit in a 1977 publication. With it we can test general purpose operational...
Wireless AM Microphone (CB1390E)
This simple AM transmitter for very small ranges uses in the original version of the 1970s, a...