HM-152-HM152T DTMF MIC.
PIN 1 +8 VOLTS DC output (max 10 Ma)
PIN 2 UP/DOWN.
PIN 3 AF Detector Output.
PIN 4 PTT.
PIN 5 MIC GROUND.
PIN 6 MIC.
PIN 7 GROUND.
PIN 8 (SQUELCH) some tranceivers
