Relay Interface For Amateur Radio Transceivers Circuit

  
The relay power in the linear is obtained from the -120-V bias supply, and the transmit keying output from the Kenwood is +12 V at 10 mA maximum. The key ingredient in the circuit is the pnp driver transistor,
Relay Interface For Amateur Radio Transceivers Circuit - schematic

which must be capable of handling at least 150 V at about 250 mA.



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