Product detector (CB9684E)

Found in Motorola documentation from the 1980s, this circuit employs an integrated device from that time, which is unusual today.

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Simple MW Radio 4 (CB4362E)
Originally this circuit is from an English magazine, but I found it in Argentina's Radio Chassis...
FET referenced constant current source (CB8830E)
This circuit was obtained in a 1967’s EEE. Transistors and integrated circuits can be replaced by...
Amplifier stage (CB21693E)
In the figure we have a simple amplifier stage for BC547 series transistors. The gain is...