Micro amplifier (CB9066E)

This microphone amplifier operates on battery voltage. The output is in an earphone. The integrated circuit used is uncommon today.

25W Transistor Amplifier (CB1321E)
We found this complementary simetry configuration in a1980s documentation. Transistors, which are...
Two Color Sequential (CB4409E)
This circuit using current components was found in an old documentation. It is a sequential circuit...
Automatic TV power off (CB5945E)
This 80's circuit turns off a TV or other appliance after a set time. The base is a 555 IC and the...