This high voltage circuit was found in a 1970 documentation. The integrated one is of the time and modern equivalents can be tested. The resistors of the voltage reducing system must be calculated.
This precision circuit was found in ancient American documentation. The most critical component is the...
Using an LDR, this Philips circuit directly activates a relay when light strikes the sensor. The...
This circuit can be used to obtain control signals from an infrared emitting source. The circuit is...