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.
Found in a 90s nHands On Electronics, this circuit triggers a relay that shuts off the load when...
This circuit uses germanium transistors and has a push-pull output with transformers. The circuit is...
Frequencies up to 50 MHz can be produced by this circuit, depending only on the used XTAL. L and...