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Category: Automation Circuits / Remote Control Views: 3222 Rank: 0 The circuit described here can be used to switch up to nine appliances (corresponding to the digits 1 through 9 of the telephone key-pad). The DTMF signals on telephone instrument are used as control signals. The digit 0 in DTMF mode is used to toggle between the appliance mode and normal telephone operation mode. Thus the telephone can be used to switch on or switch off the appliances also while being used for normal conversation. visit page.
Related circuits RS-232C port scans remote keypad In many embedded or control applications, you might prefer to use a small, customized keypad with your PC-based system rather than a full-fledged alphanumeric keyboard. You may also need to locate the keypad some distance from the system hardware. If you have no parallel ports available for this... This circuit lets you control any line powered electrical device (a lamp, television, fan, etc.) using any infra-red remote control. Almost everyone these days has a pile of old IR remotes left over from appliances they have long ago disposed of them. With this circuit, you can put them back into... Remote Control Extender Circuit A signal from an IR remote control is converted from IR radiation to a frequency pulse that can be transmitted tlirough coaxial TV cable or any other two-conductor wire to another room, The transmitter is built around two CMOS 555 timer ICs (TLC 555s). The transmitter generates a modulated 35-kHz This circuit is intended for precision centigrade temperature measurement, with a transmitter section converting to frequency the sensor`s output voltage, which is proportional to the measured temperature. The output frequency bursts are conveyed into the mains supply cables. The receiver section... This circuit can be used to operate a VCR or CD player from another room. It"s really an infrared signal repeater. The s The transmitter is a very simple crystal oscillator. The heart of the circuit is the tuned circuit consisting of the primary of the transformer and a 10p capacitor. These two components oscillate when a voltage is applied to them. The frequency is adjusted by a ferrite slug in the centre of the... This circuitry offers some features that are highly desirable when building a QRP (or ANY) transceiver. It also includes a combination of features that many might not always take the time to include in their projects. Considerable effort has been made to assure that in this design, the RIT (RX... Use landline or mobile phone as a Remote Controller - DTMF circuit based on 8...
GSM REMOTE CONTROL SWITCH - TELCON 500
Comments
apurba wrote on Sep 6, 2009
nice device by which any one can make switched on or off 9 device by telephone at anyplace of the world.
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