We found this circuit in an old Mullard (Philips) documentation on the 555 and 556 integrated circuit (double 555). The relay must be 12 V with contacts that support the horn current.
This power supply that can supply current according to the LEC is suitable for small projects. The LED...
Obtained in an American documentation from 1976, this circuit has a constant current source for...
This two-transistor output stage source currents up to 100 mA to a load using the 2N3906, but can...