Miniature
Slide Switch, PCB Mount Type SPDT


The schematic
symbol shown for S1 here is actually a single throw type.
The radio uses just two connections on a double throw switch to
connect the battery. SPDT stands for single pole double
throw. On such a switch, there is one connection usually in
the middle which connects to either of two other connections
depending on the position of the switch lever. You may also
see this type referred to as 1P2T.
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