Baxandall tone control (CB9372E)

Found in RCA documentation from the 90s, this bass and treble control uses an operational amplifier from the time that can still be found today.

| Clique na imagem para ampliar |

Even and odd counter (CB23780E)
This interesting digital counter with relays with complementary outputs was found in the Radio...
Socket control (CB24880E)
The idea of this circuit is that when the device in SO1 is turned on, the device connected to...
Battery Expander (CB12755E)
This interesting circuit allows to obtain symmetrical voltages from a simple battery. Among its...