This soft start circuit was found in a 1965 General Electric documentation. The SCR and bridge diodes must be in accordance with the controlled motor's current.
The existence of field effect transistors at the input of the integrated circuit (operational...
This circuit has a maximum output current of 5 A, and the 2N3055 must have an excellent heat sink....
This circuit is suggested by Motorola and is based on a 1723 voltage regulator. The 2N3055...