Tunable notch filter (CB7402E)

Found in 80's Electronic Engineering, this circuit can tune the frequency to be rejected. The power supply must be symmetrical.

| Clique na imagem para ampliar |

Digital Die (CB17098E)
This circuit is from 1997 documentation, based on the well-known integrated circuit 555 and 4017....
DC Motor Speed Control (CB12321E)
This circuit is from 1980 documentation. We can exchange the BC177 for a BC557 and the TIP41 must...
Single Voltage Reducer (CB16872E)
From different input voltages V, it is possible to reduce the voltage to several fixed values...