The purpose of this circuit found in an old Elektor is to light a lower power lamp when the bigger one burns out. The loads depend on the triacs.
This circuit provides a negative voltage of -5 V with a current of up to 100 mA. The circuit is...
This circuit, which uses a quadruple comparator, was found in old American documentation. The...
This circuit, obtained from old documentation, allows the recovery of sulfated batteries. The...