This circuit was found in a 1966 EEE. What it does is it converts the logic levels of 0 V and +4 V into -6 V and +6 V. Some older type transistors can be replaced by modern equivalents.
We find this conventional amplifier with complementary transistors in a 1987 documentation. The circuit...
The purpose of this 2000 documentation circuit is to decode SSB (BLU) signals to be audible on...
This circuit changes the wave shape of a square signal according the values of C1 and R1. Other...