The bridge diodes of this circuit, found in a 1967 publication, are according to the motor current. The SCR must also match the engine serving those in the TIC series. The SCR must be equipped with a radiator and the motor is of the field winding and armature type. ST2 is a common diac of D1, D2 and D3 can be 1N4004 or 1N4007.
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