Audio & Video Entry Security Intercom
Intercoms are generally comprised of fixed microphone/speaker units, with or without built-in camera, which connect to a central control panel. The most basic intercom circuit consists of two intercom stations linked to each other with a push to talk switch. These kind of circuits are simple, and generally consist of only one or two amplifiers and use the speaker as normal speaker and microphone (how it is used depends on talk switch position). Depending on the circuit design there could be one switch on one end, or spearate switches on both stations.
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in section "Door intercommunication systems"
View also products categories "Intercoms and accessories"