ON/OFF Switch GSM based (DTMF)

Below is a simple on/off switch using GSM mobile network .It will work on miss call option , for which you don't have to pay , one miss call for ON and other for OFF .due to the latching output from the decoder 8870 & 4028 IC , it is recommended to record two DTMF tone in mobile & set it as a ring tone for a specific user ,It means that if we call the said mobile , lets i have set 2 DTMF tone 9 & 6 , output from IC 4028 pin # 5 which having # 9 DTMF tone is connected to opto-coupler PC817 then it is connected to IC 4013 ON/OFF switch ,Once you call the mobile it will once activate (on) the pin # 9 while DTMF tone # 9 was set first , than after it tone # 6 will be observed at 8870 , so it will activate # 6 , pin # will be off ,again by calling the  the mobile circuit will be ready for the next action either off or on.For confirmation a simple switch will be added to make call busy or continuous ringing which will confirm that the desire action ON or OFF successfully done.

                           

                                   

CAR TRACKER (GSM + GPS)

  In this project a phone set required having built-in GPS module where you can get location coordinates and GSM location through sms from your vehicle,There will be call originated from car while someone try to open car door.  You can get alert  from car while someone try to open car door   For call originating from car will required speed dial option in mobile phone set.  First enable speed dial option, save your number with specific digit ,  solder the desire button,   now   both wires from the will be interface with car doors switch, It means that if someone open the door switch will be operated resulting to dial the specific  speed dial  number.  Basic concept in circuit is that despite of different cellular mobile phone number in the tracking car should pass a combination (sequence) lock key, for this a simple 4081 AND gate IC were used where 4 keys required in a desire sequence, these 4 inputs were taken from 4028 (4 bit binary to decimal converter) IC to 4081, which is directly connected to 8870 DTMF IC outputs, in the last a simple touch on/off circuit were used from IC 4013.Interface between ICs 4028 & 4081 were done with the opt coupler PC817, Once sequence completed in IC4081, reset will required it is then done while using relay 2 along PC817.
Features:-

                      1):-   Get location all over Pakistan with Google Map
                      2):-    Alert while someone nearby Car.
                      3):-   Full control using DTMF remote control.
                      4):-   Only specific users can access control.

                      5):-   Engine Kill release option 

FM Transmitter 6 Watts

Below is the versatile FM Transmitter build around car MP3 player ,which can deliver up to 6 Watts.In this circuit RF signal is taken from a MP3 player built-in low power transmitter, it is than boosted by the two more RF stages ,For making any RF transmitter circuit at least two meters are very necessary , one is frequency counter & the other is RF field strength meter.In the first stage of transmitter one of the best driver transistor 2SC2053 were used .you can use the other transistor up to 500MW power for this stage.In the second stage another RF transistor 2SC1971 were used.also you can use any equivalent transistor. Note : L3 will be 4 turns , L6 will be 12 turns, Heat Sink required for 2SC1971 (C2053 can be used ).
RF field strength meter also available below, up to 3 different circuit i have tested photo added.

https://obaidkakar.blogspot.com/2019/10/fm-transmitter-25-watts-88-108-mhz.html

arduino-gsm-jammer-900-mhz

                                   

https://obaidkakar.blogspot.com/2018/08/arduino-fm-radio.html AliExpress.com Product - 5pcs 2SC1971 C1971 TO-220 35V 2A AliExpress.com Product - 10pcs/lot 2SC2053 C2053 TO-92 NPN transistor, VHF RF amplification


RFC COIL: 0.68 uH



 Authentic Original AliExpress.com Product - 100Pcs Multilayer Chip Inductor 0805 68nH 5% 2012 AliExpress.com Product - CJMCU-4713 SI4713 Stereo FM Transmitter





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Perfect Home & Car Security System GSM Based ( DTMF )

This is a versatile & secure circuit for any home, whole circuits is explain of my post DTMF Remote Control GSMBased .In this project you will need a mobile phone where you can set your own ring tone.Then you have to record any  DTMF tone , lets record number 3 tone in mobile direct or by PC , transfer this tone to the mobile (circuit Mobile),Now set this tone as a ring against all the family member stored in mobile,It means that if any family member will call the mobile DTMF tone of # 3 will heard from mobile ,.Now this mobile is connected with circuits (DTMF Remote Control GSMBased),All process is same like my post (DTMF Remote Control GSMBased).But in this condition due to the same tone from all  the family mobiles will be the same output ( tone) from the BCD 4028, like Tone 3 will be taken from pin 15 of 4028. Other caller will not be entertained having no any assigned DTMF tone. This circuits can be connected with  main gate lock  , where only family can access .

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Day Night Switch (Solid State)

Now a days LED lights are so common everywhere, you can direct connect it with battery no need any UPS / invertor, I decided to installed such power LED light at roof top along day night switch, so I design a simple switch circuit with minimum components, I found it very reliable & stable, a high power FET were used, you don’t worry about the FET you can use any powerful N-Channel FET available in the market which are mostly used in UPS. Heat sink insulation Recommended between FET & heat sink if not no issue . I used FET 47N60C3 ,  LDR,  Variable resistor 305 mega ohms,   Pressure 12 V. Separate heat sinks for both FET & LED are recommended.  

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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