Continuity tester (CB7386E)

This circuit was found in a Hands-On Electronics from the 90's. The FET can be any general purpose.

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Two SCR dimmer (CB7206E)
This circuit was found in a Motorola Manual of 1965. The circuit has neon lamps as trigger...
Frequency to Voltage Converter LM331 (CB14432E)
The circuit presented was obtained in the National Semiconductor's Linear Applications Handbook of...
Recording and playback circuit with ISD1000A (CB7441E)
Found in an Electronics Now from the 90s, this application uses an integrated circuit from the...