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Dual voltage supply FW doubler and FW bridge combo

 

 This unique circuit allows use of either dual-voltage AC mains, such as 120/240 volt operation, or dual output voltages with a fixed input supply. This is accomplished by switching between a full-wave doubler configuration, or a full-wave bridge configuration, with a simple SPDT switch or relay. Note the lower end of the AC source, in this case represented by a transformer, must be switched to either the junction of C1 and C2 to form a doubler, or the lower end of the input source is switched to the bridge terminal to form a bridge system. Both systems are full-wave rectified.