Microphone balanced amplifier (CB9388E)

This circuit was found in an old American documentation. The integrated circuit used is uncommon today.

| Clique na imagem para ampliar |

Antenna Tuner (CB21637E)
The purpose of this circuit is to improve the reception of signals from the short-wave band. The...
Light detector (CB8338E)
This highly sensitive light sensor was found in a 1970 General Electric documentation. The circuit...
Wireless Headset Transmitter (CB20970E)
This circuit was found in a Popular Electronics from the 90's. The CMOS integrated circuit used is...