DELTA PULSE 3 METAL DETECTOR

Delta Pulse 3 metal detector (Pulse induction) is a versatile & professional detector, same like delta pulse 2,This detector have a LCD screen facility,  actually the every step like in the delta pulse 2 is done here by the micro controller , pulse for the Coil driven transistor FET , the delays like in delta pulse 2 by the 4538 also done by the micro controller, other IC used for the interface between the output result , battery power to the microcontroller , GLCD used in this project is used where you have facility to monitor every necessary data . only basic IC TL081 used for signal amplification,   

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DTMF Remote Control GSM Based

It was a big experiment for testing this circuits, a very versatile remote control circuit which is consist of DTMF decoder IC 8870 & 4 bit BCD to decimal 4028 IC, Four binary outputs are connected to the inputs of BCD to decimal 4028 IC .You can control up to 9 appliances by this circuit, out puts will be in latched form.Mobile phone can be easily used with circuits, all the keypad button 1 to 9 will be used.i used this circuit for Car GPS remote control ,actually the output from the 4028 will be a latched on state due to the IC 8870 , this IC have latched output .any pin will remain active untile other code were not given the decoder by the any source like mobile or any other source.