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





AliExpress.com Product - Car Bluetooth FM Transmitter MP3 Player with 1.1" Display Dual USB(1A/3.1A) Supports TF/USB Input Radio Modulator Car Kit

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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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.

PTCL EVO Wingle 9.1 Mb USB (Built-in Wi-Fi) powered by mobile battery (like a portable 3G EVO Nitro Cloud)

It was a time when there was no Battery Backup for any internet USB device , then i decided to design a trick to power the USB from the mobile battery , a USB female pin were for USB to be powered , dual color LED were use for indicating charging & on indication , a slide switch use to on/off the USB,a small pin female were used to charge the battery, a very simple project every guy can assembled it, plz care of USB & charger pin polarity, with high apms battery up to 5 to 8 hours backup can be expected , 

It can be easily charge by using common Nokia charger, don’t worry about over charging there is built in cutoff circuit in side every mobile battery,

One thing I missed that there should be USB pin charging facility and schematic of this project, no issue I will add it soon. 

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