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.
This circuit was obtained from HAM Radio magazine in an 80's issue. The FETs are types of the time...
This circuit turns on and off from pulses applied to the CLK input. The output 0 goes to the “’1"...
This circuit uses a lower frequency crystal in an excitation system for an oscillator with a coil...