Low temperature sensor (CB7814E)

Found in 90s Radio Electronics, this circuit is indicated for reading temperatures below zero.

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...