Showing posts with label phone. Show all posts
Showing posts with label phone. Show all posts
Sunday, September 14, 2014
Cut Phone Line Detector
At present we can see most of people try to tap telephone line.So this is the schema to avoid that matter.If some one disconnect the line The unit which attach to the LOAD will operate
Parts:-
Q1 2N3904 Transistor or 2N2222
Q2 2N3906 Transistor
C1 0.47uF 250V Mylar Capicitor
Q3 IRF510 Power MOSFET
D1 1N914 Diode
R1, R2, R3 22 Meg 1/4 W Resistor
R4 2.2 Meg 1/4 W Resistor
MISC Wire, Phone Connectors, Circiut Board
Saturday, September 13, 2014
Cellular Phone calling Detector
This schema was designed to detect when a call is incoming in a cellular phone (even when the calling tone of the device is switched-off) by means of a flashing LED.
The device must be placed a few centimeters from the cellular phone, so its sensor coil L1 can detect the field emitted by the phone receiver during an incoming call.
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Parts:
R1 100K 1/4W Resistor
R2 3K9 1/4W Resistor
R3 1M 1/4W Resistor
C1,C2 100nF 63V Polyester Capacitors
C3 220µF 25V Electrolytic Capacitor
D1 LED Red 10mm. Ultra-bright (see Notes)
D2 1N5819 40V 1A Schottky-barrier Diode (see Notes)
Q1 BC547 45V 100mA NPN Transistor
IC1 7555 or TS555CN CMos Timer IC
L1 Sensor coil (see Notes)
B1 1.5V Battery (AA or AAA cell etc.)
Stand-by current drawing is less than 200µA, therefore a power on/off switch is unnecessary.
Sensitivity of this schema depends on the sensor coil type.
L1 can be made by winding 130 to 150 turns of 0.2 mm. enameled wire on a 5 cm. diameter former (e.g. a can). Remove the coil from the former and wind it with insulating tape, thus obtaining a stand-alone coil.
A commercial 10mH miniature inductor, usually sold in the form of a tiny rectangular plastic box, can be used satisfactorily but with lower sensitivity.
IC1 must be a CMos type: only these devices can safely operate at 1.5V supply or less.
Any Schottky-barrier type diode can be used in place of the 1N5819: the BAT46 type is a very good choice.
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The device must be placed a few centimeters from the cellular phone, so its sensor coil L1 can detect the field emitted by the phone receiver during an incoming call.
Parts:
R1 100K 1/4W Resistor
R2 3K9 1/4W Resistor
R3 1M 1/4W Resistor
C1,C2 100nF 63V Polyester Capacitors
C3 220µF 25V Electrolytic Capacitor
D1 LED Red 10mm. Ultra-bright (see Notes)
D2 1N5819 40V 1A Schottky-barrier Diode (see Notes)
Q1 BC547 45V 100mA NPN Transistor
IC1 7555 or TS555CN CMos Timer IC
L1 Sensor coil (see Notes)
B1 1.5V Battery (AA or AAA cell etc.)
Stand-by current drawing is less than 200µA, therefore a power on/off switch is unnecessary.
Sensitivity of this schema depends on the sensor coil type.
L1 can be made by winding 130 to 150 turns of 0.2 mm. enameled wire on a 5 cm. diameter former (e.g. a can). Remove the coil from the former and wind it with insulating tape, thus obtaining a stand-alone coil.
A commercial 10mH miniature inductor, usually sold in the form of a tiny rectangular plastic box, can be used satisfactorily but with lower sensitivity.
IC1 must be a CMos type: only these devices can safely operate at 1.5V supply or less.
Any Schottky-barrier type diode can be used in place of the 1N5819: the BAT46 type is a very good choice.
Thursday, September 11, 2014
Solar Mobile Phone charger complete circuit diagram
Solar Mobile Phone charger Circuit:
Here is another idea of harvest Solar energy for charging.This charger can charge almost all types of batteries such as Mobile phone batteries. It uses a solar panel to convert light in to electrical energy.
This schema explains itself whole procedure.
Click to zoom
A 12 volt and 5 watt solar panel is used as source of current.The cells in the panel are made up of semiconductor material which convert sun light energy in to electrical energy.
When the sunlight is a peak means maximum, then solar panel can generate upto 16.5 volts with 400mA current.This current is able to charge mobile phone battery.
Diode D1 allow current to pass in to three regulator ICs to get regulated output.
This output voltage is able to charge Lead Acid battery.
The battery can be connected to point C and ground.
IC2 gives regulated 6 volt to charge NiCd battery. IC3 provides regulated voltage to charge all types of mobile phone batteries which is rated at 3.6 volt.
Red led indicates its charging the battery.
Last Words:
This is simple schema, if you found any difficulty in understanding this schema, let me know through comments, ill respond you as earlier as possible.
Here is another idea of harvest Solar energy for charging.This charger can charge almost all types of batteries such as Mobile phone batteries. It uses a solar panel to convert light in to electrical energy.
This schema explains itself whole procedure.
Click to zoom
A 12 volt and 5 watt solar panel is used as source of current.The cells in the panel are made up of semiconductor material which convert sun light energy in to electrical energy.
When the sunlight is a peak means maximum, then solar panel can generate upto 16.5 volts with 400mA current.This current is able to charge mobile phone battery.
Diode D1 allow current to pass in to three regulator ICs to get regulated output.
This output voltage is able to charge Lead Acid battery.
The battery can be connected to point C and ground.
IC2 gives regulated 6 volt to charge NiCd battery. IC3 provides regulated voltage to charge all types of mobile phone batteries which is rated at 3.6 volt.
Red led indicates its charging the battery.
Last Words:
This is simple schema, if you found any difficulty in understanding this schema, let me know through comments, ill respond you as earlier as possible.
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