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 |

2 transistor radio (CB20517E)
This circuit with germanium transistors was found in documentation from the 50's. The transistors are...
Old Phase Shift Oscillator (CB13956E)
The circuit presented was found in a documentation from the 1950s, generating a sinusoidal signal...
VHF Preamplifier (CB19599E)
This circuit was originally indicated as a signal reinforcement step for the previous receiver...