门禁电话通话电路图,电路图,电话机电路图,门禁电话通话电路图 门禁,通话,门禁电话通话电路图In this doorphone circuit,an 8 ohm speaker is used both as a microphone and also an output device. The BC109C stage amplifies in common base mode, giving good voltage gain , whilst providi...
2023-09-18 21:51:00电路图电路图 门禁 电话