Wireless Intercom is a wireless communication equipment and of course without a pulse (usually to communicate between rooms in your home or office environment or our shop). This tool uses electricity as object. So tool is very practical at all, so it's up will be paired at the socket where it provided still be in the same meter (1 phase). This tool can be used up to 4 units a separate channel.

How to create niche Telephone Intercom Circuit With Ringer. the simple intercom circuit is designed with transistors the photo and detail shown here . changeover switch is not required on intercom circuit and you can use it just like a telephone and a ringer circuit is also included.

IC1 UM66 and transistor Q1 forms the ringer section. When pushbutton switch S1 is pressed UM66 produces a musical tone. This tone is amplified by Q1 and is coupled to the collector of Q2. Condenser Mic M1 is used to pick the conversation and Q2 is used to amplify it. R2 powers the condenser Mic while C2 is the DC decoupling capacitor for the amplifier stage based on Q2. The next stage of the circuit is a transformer coupled push pull amplifier stage based on L1, Q3 and Q4. Capacitor C5 is the power supply filter while capacitor C4 couples the output of the push pull amplifier to the ear piece. Picture of Telephone Intercom Circuit With Ringer.

How to use : 

• Attach the wireless intercom is on the wall outlet, then adjust channel selection with a partner who will be addressed (wireless intercom which was in another room). Thus was ready to communicate. 
• CALL button to call. 
• TALK button, should be pressed to speak. or activate the LOCK button Facebook does not need to press the TALK button continuously at the time speak.