Infrared detector (CB7814E)

This circuit was found in a Popular Electronics of the 90s. The operational amplifier admits equivalent and the phototransistor can be of any type.

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TLC555 PWM Motor Control (CB26038E)
This simple circuit for motors that depends on the MOSFET used was found in the January 1998...
Two Input Shield (CB19753E)
This transistorized shield also functions as a logic gate. The power supply can be in the range of 4.5...
Small audio oscillator (CB8447E)
Found in a 90s Popular Electronics, this Hartley oscillator uses an output transformer of the type...