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1.
Multivoltage AC / DC Power Supply
Jacks Jl, J2,
J3, and J4 are three-conductor phone jacks. Switch S2 is an SPDT toggle or slide-type which in the position shown short circuits diode CR so that the output will be ac.
http://www.fun-home-projects.com/electrical_projects/tools/multivoltage_ac_dc_power_supply.html