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.
Based on an LS3404 this circuit was found in the July 1990 issue of Radio Electronics magazine. |...
This circuit uses as a sensor a thermocouple to detect air flow. We found this circuit in a 1980s...
This RF signal meter has a switch position that allows calibration and comparison of low intensity...