Today I am going to introduce a simple mobile phone remote control
circuit which is so simple that everybody can easily assemble it, In this circuit following items which are easily available
every where. here Mobile phone set, Relay (3V DC), Capacitor 4700 uf, 25 v will required I think 3V DC relay is not difficult to find in the market. In this circuit 2 wires are taken from the mobile vibrator points, these points are +ve & -ve , Simply connect both +ve & -ve output to the relay points.
There is enough voltage from the vibrator point to operate the relay. Once you call the said mobile you will observe the
relay will not continuously ON & OFF due to signal from the vibrator
output , here we need continuous relay energization while calling mobile, for
this we have to add a capacitor in the circuit parallel to the relay points,
but should care about the polarity of capacitor, Capacitor +ve shout be
connected to +ve point of vibrator, this circuit can be used for door open, car
safety,
