FMS Serial Port Circuit Diagram

Modified for JR Transmitters

This is based on the circuit from the FMS manual.

The following changes have been made to accept the JR signal which is AC coupled and 1.2v peak to peak:

• D1 added to prevent reverse voltage being applied to transistors when com port is idle.
  
• R2 added to bias TR1.
  
• R3,4 values increased to decrease drain on the serial port.
  

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