Pink Noise Generator (CB5433E)

This circuit was found in a 1980s documentation. Modern general purpose transistors can be used. The output signal needs good amplification.

Audio Limiter (CB948E)
We got this circuit in a publication of 1987. This is an audio limiter, a circuit that cuts peaks...
Two-Power Selector Using Triac (CB515E)
When S1 is in 1, the circuit operates with of half the total power applied to the load. When in...
Temperature Control (CB1575E )
With the figure circuit it is possible to control the amount of heat generated by the heating...