Description
Instructions phone calls lights
Phone calls phone calls lights kit can be used to sense the GSM signal display, sensing distance up to 1 m, is a very interesting DIY module.
First, the electrical characteristics
1, supply voltage: 3 to 12V;
2, sensing distance: about 1 m;
3, PCB board size: 2.2cm * 2.8cm;
4, Scope: GSM mobile phone signal, for CDMA phones are useless;
Second, the circuit theory
The main circuit is amplified antenna sensor signal circuit and circuit. Sensing signal through the antenna 3 to S8050 transistor amplifier to drive the LED, so that light up. When no signal is detected, no calls or no GSM phones, LED circuit is not only detects the signal to light up LED.
Third, assembly considerations
Inductance of production:
Inductance 0.25 to 0.5MM enameled available in pen core above can be around 5-10 laps. After a good round with a blade to scrape paint inductor 2, so we go soldered to the board.
Four，Component list
|
Component
|
Label
|
Footprint
|
Value
|
Number
|
|
Ceramic capacitors
|
C1, C2
|
RAD-0.1
|
103
|
2
|
|
ISS86
|
D1
|
DO-35
|
|
2
|
|
5MM while LED
|
D2
|
LED_5mm
|
|
1
|
|
0.35MM Enameled
|
|
|
|
1
|
|
S8050
|
Q1, Q2, Q3
|
TO-92B
|
|
3
|
|
Resistance
|
R1, R2
|
AXIAL-0.4
|
10K
|
2
|
|
Resistance
|
R3,R4
|
AXIAL-0.4
|
1M
|
2
|
|
Resistance
|
R5
|
AXIAL-0.4
|
220
|
1
|
|
Resistance
|
R6
|
AXIAL-0.4
|
470K
|
1
|
|
