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Circuit diagram of the DTMF decoder module 2.3 Relay Control Module... . Download scientific diagram | Circuit diagram of the DTMF decoder module 2.3 Relay Control Module Circuit The Relay control module circuit shown in Figure 7 can be used to remotely control three different home appliances electronically. The module is controlled through the activation of the correct DTMF on the phone keypad. This turns on the proper relays. Â from publication: DESIGN AND CONSTRUCTION OF A GSM-BASED MULTI-PURPOSE MEASURING DEVICE FOR UHF SIGNAL STRENGTH LEVELS. | It has become common for many business entrepreneurs to move with two or three mobile phones at any particular time in Nigeria. The reason is usually anchored on the epileptic reception of the telecommunications networks and their desire to keep in touch with their... | Strength, Weather Forecasting and Reception | ResearchGate, the professional network for scientists. www.researchgate.net