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Automatic Antenna Switch Circuit using LM3914

2015-09-05 20:48  
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An automatic antenna switch circuit diagramis shown in the following schematic. It uses the LM3914 integrated circuit which the output is used to activate transistors as switches to provide 12V DC for the remote coax relays.

antenna switch circuit diagram

Thisautomatic antenna switch circuitrequires MPS2907 transistors, LM3014 IC, 5mm 10mA @2V LEDs, 1N914 diodes, all 1/4 Watt 5% resistors and disc ceramic capacitors.

 

Or you might need the LM3914 datasheet (source: national.com)