2012年10月3日 · HM-36 Hand microphone schematic is found on Page 10 of the IC-737 manual. You can see a BLOCKING capacitor INSIDE the HM-36, as the DC voltage to power the Elecret element is separated from the AUDIO output of the Elecret element (This is how 3-wire Elecret mic elements work!) You MUST use a DC Blocking capacitor -- to AVOID DAMAGE to the