0 Simple Field Strength Meter

This simple circuit can be used to test generated signal from a wireless transmitter. On the circuit and adjust the potentiometer R4 until the reading of meter is zero. Using this circuit, you can test also if your FM radio jammer circuit or FM transmitter is working or not. When there is signal, the meter needle will move.
schematic diagram
Part List:
R1 - 560 kilo ohms 1/4W
R2 - 1.8 kilo ohms 1/4W
R3- 1.8 kilo ohms 1/4W
R4 - 5 kilo ohms potentiometer
D - 1N60 or similar germanium diode
Q - 2N2222 or similar NPN transistor
M - 1mA meter or any meter available
Ant - 6 inches wire
Bat - 1.5V to 6V battery
2N2222 pinout


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