relay Telephone Switcher | Electronic Schematic Diagram https://electronicscheme.net Schematic Diagram & PCB Design Fri, 29 Jul 2011 05:55:14 +0000 en-US hourly 1 https://i0.wp.com/electronicscheme.net/wp-content/uploads/2017/05/cropped-transparent_text_effect.png?fit=32%2C32&ssl=1 relay Telephone Switcher | Electronic Schematic Diagram https://electronicscheme.net 32 32 129969089 Telephone Switcher https://electronicscheme.net/telephone-switcher/?utm_source=rss&utm_medium=rss&utm_campaign=telephone-switcher https://electronicscheme.net/telephone-switcher/#respond Fri, 29 Jul 2011 05:55:14 +0000 http://electronicscheme.net/?p=1243 This diagram is the schematic diagram of telephone switcher using relays. This device connects to the telephone line and can be used to remotely control […]

The post Telephone Switcher first appeared on Electronic Schematic Diagram.]]> Telephone Switcher circuit

This diagram is the schematic diagram of telephone switcher using relays. This device connects to the telephone line and can be used to remotely control up to 4 relay outputs using a DTMF (tone dialing) telephone. A number of user settings are available to improve the useability and security of the device. The kit comes complete with a small plastic case with silk-screened front and rear panels.

The brain of this circuit is microcontroller chip Atmel MCS51 family AT89C2051. The source code is not available here, you may find out the source code by yourself.

The diagram is quite hard to designed in PCB, you may purchase the telephone switcher kits from this page:? http://electronickits.com/kit/complete/tele/ck603.htm

The application notes for this circuit can be download here

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