This circuit was found in documentation from the 1980s. The circuit uses several components of the time, which are uncommon today. We must not supply it with a transformerless power supply.
In the figure we have the way to use a common LED as a light sensor. The operational power supply...
This TTL traffic light circuit was found in an English magazine from 1977. The magazine no longer...
With the circuit shown in the figure, we have a logic signal to activate a calling device when...