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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Comparators for opposite polarities (CB9590E)
This circuit was found in a 1980s documentation, using a comparator from the time. The...
Interval for windshield wiper (CB22188E)
This windshield wiper interval was found in old documentation. The NPN transistor is general...
Common Base RF Amplifier (CB4684E)
This is an RF amplification step for small signals using the common base configuration. The...