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.
Settings like this can be found at various points on this site. The trigger door can be a 4093...
Toshiba LDO Regulators Toshiba has a wide variety of low voltage drop (LDO) linear regulators...
With a 10 V input this circuit provides a 25 V output. The circuit is from December 1985 Radio...