PURPOSE:To avoid undesired talking by informing it to a caller that whether a desired opposite party is present or not prior to ringing of a ringer by an incoming call. CONSTITUTION:A call signal transmitter 5 detects a call signal to send an incoming call to a control circuit 8. The circ...
IR2177和IR21771分别是IR2277和IR22771的600V版本。IR2114和IR21141分别是IR2214和IR22141的600V版本。