Mobile incoming call indicator This circuit can be used to avoid being bothered by mobile phone rings when at home. Even if the ringer is turned off, this circuit will produce a visual indication if it is placed near a Mobile incoming call indicator mobile phone.
When the mobile phone receives a call, the transmitter inside it is engaged. The transmitter’s frequency is roughly 900MHz. By induction, the coil L1 takes up these oscillations and feeds them to the base of Q1. The transistor Q1 is triggered as a result of this. Because Q1’s Collector is linked to IC1’s (NE555) pin 2, the IC1 is triggered, causing the LED attached to its output pin (pin 3) to flicker. The incoming call is indicated by the LED blinking.
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Circuit diagram with Parts list.
- On a 5mm dia plastic former, make 150 turns of 36 SWG enamelled copper wire to make coil L1. If a 10 uH coil is available, you can buy it from the shop.
- A 6V battery can be used to power the circuit.
- Assemble the circuit on a high-quality printed circuit board.
- Polyester capacitors will be used for C1 and C3.
- The electrolytic capacitor C2 must have a voltage rating of 10 volts.