Crystal converter (CB7327E)

This circuit was found in a Popular Electronics from the 90's. The circuit can be used to convert signals to frequencies up to 25 MHz.

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High Side Current Sensor (CB5218E)
This High Side sensor with the L1637 was obtained from a Linear Technology 2005 own manual that...
Common Telephone Line Simulator (CB6873E)
This simple circuit can be used to power a simple communication system using ordinary telephones....
Very low frequency oscillator (CB9042E)
This circuit can generate signals from 1 Hz to 20 Hz in 2 Hz ranges. The table next to the diagram...