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EMITTER PHONE MICRO SPY

EMITTER PHONE MICRO SPY

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  IDEA ELECTRONIC PROJECT

EMITTER PHONE MICRO SPY

This assembly is an automatic transmitter frequency modulation, which allows when connected in series with the phone, to broadcast on an FM receiver wedged between 88 and 108 Mhz, telephone conversations interlocutors.

USE
A final check the implementation of components and welds.
Install the transmitter in series with the phone. Simply unplug a son from the line, the telephone (the white wire for example), and connect to the circuit at the point marked "L2".
Then connect the block released from the telephone set, a small wire on the circuit, at the point marked "L1".
Connect a small antenna wire on the circuit ie at the point marked "A".
Put into operation a FM receiver tuned to a frequency between 88 and 108 Mhz, if possible without station.
As soon as one picks up the receiver, the transmitter transmits the conversation the interlocutors on the receiver.
Set the adjustable capacitor CA, to select a free frequency receiver.

NOMENCLATURE
1-1 printed -Circuit
2- 1- transistor 2N 2369A T = 2N706
3- 4-1N4148 diodes D1-D2-D3-D4
4- 1- 100R resistor (brown-black-brown) R4
1- 5- 470R resistance (yellow-violet-brown) R1
6- 1 2.2K resistor (red-red-red) R3
7- 1 10K resistor (brown-black-orange) R2
8- 1-cond. Adjustable CA FP 10/60
9- 1-capacitor 4.7 PF C3
10- 2-INF capacitors C1-C2
11- 10 cm enameled wire diameter 4 / 10mm
12- 1- welding
13- 1-wire

DIAGRAM
The signal from the telephone line passes through the telephone, and feeds the transmitter.
The diodes D1 to D4 rectify the voltage, to supply the transistor T.
The latter is mounted in oscillator, the capacitor C3 maintenance oscillations.
The adjustable capacitor sets the transmission frequency.

MOUNTING
The assembly does not represent any difficulty.
The components are soldered closest to the printed circuit.
Start with the diodes D1 to D4, respecting the position of their ring.
Solder resistors and non-polarized capacitor.
Solder the trimmer.
Solder the transistor correctly oriented ergot.
Realize the inductor by winding 5 turns of wire enamel 4/10 of a length of 10 mm
a diameter of 5 mm outer guide (eg drill).
Remove guide and welding choke on the PCB.
To weld the ends of enameled wire, must be scraped in order to properly
remove the enamel.
It is essential for the proper functioning of the assembly, the winding is done with the utmost care.

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