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Finally, connect the transistor radio to the switch circuit. Because the switches are wired in parallel, you can connect the radio across any of the switches. Here’s how: Open the radio and find one of the two wires that run to the battery. Carefully cut the wire near its midpoint, then remove about l/2 inch of insulation from the end of each half. Now use insulated wire to join the two wires from the radio to one of the switches (see the fourth diagram).