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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DC Motor Speed Control (CB18964E)
This speed control for motors up to 500 mA was obtained in an old European documentation, but it...
Triangular Limiter with the 741 (CB13514E)
This circuit cuts a rectangular signal, and a trapezoidal signal is obtained. The circuit is from...
Wien Bridge Oscillator (CB9039E)
This low frequency sinusoidal oscillator was obtained in documentation from the 1970s. Operational...