Author Archives: obaid1470

A very Classical motor driver circuit found in many appliances, this circuit is made around two 5 pin relays, here DC power to the motor in either direction will be possible by the both relays by pressing the buttons, if button S2 pressed –Ve current will flow through relay K2 coil , to the +VeContinue reading “Motor Control Circuit”

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 DTMFContinue reading “ON/OFF Switch GSM based (DTMF)”

  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 carContinue reading “CAR TRACKER (GSM + GPS)”

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 necessaryContinue reading “FM Transmitter 6 Watts”

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 PCContinue reading “Perfect Home & Car Security System GSM Based ( DTMF )”

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, aContinue reading “Day Night Switch (Solid State)”

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 deltaContinue reading “DELTA PULSE 3 METAL DETECTOR”

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

In this circuit one relay & PC mouse were used, no such a electronic circuit were used  , here 2 micro switch & 8 pin DPDT relay 220 v used, if you see the connections of the relay you will see that main AC 220 were connected to points 7 & 8, another wire takenContinue reading “ON/OFF Switch using DPDT relay (220V) & PC mouse”