This power source was found in a 1969’ Electronics World. The version is too sophisticated by the current it supplies and can be implemented with modern transistors.
In the figure we have a third fast adder that we found in an 80's Electronic Engineering. The circuit can...
This circuit for TTL probes uses a 7400 as the main element. The circuit memorizes the signal...
This circuit triggers an oscillator when any of the sensors is opened. The circuit can be powered by...