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MICRO SPY TRANSMITTER FM 60-140MHZ

MICRO SPY TRANSMITTER FM 60-140MHZ

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  IDEA ELECTRONIC PROJECT

MICRO SPY TRANSMITTER FM 60-140MHZ
The assembly is a Micro FM transmitter, which allows to transmit over a short distance, and is received on an FM receiver tuned to a frequency between
88 and 108 MHz.
Power is provided below 9 V.

DIAGRAM
The diagram indicates the use of two transistors.
The first transistor is a BC547, which receives the signal from the microphone and that amplifies it. The modulation is then directed to the base of the second oscillation transistor 2N2219. Maintenance of oscillators is provided by the 4.7PF-C2 capacitor. The trimmer 4 / 20PF enables the frequency setting. The antenna output is on the center tap of the coil. For assembly, no precautions are necessary if it is the effective respect of the orientation of transistors, capacitors and the microphone. The metallic part of the latter is connected at least assembly. Put the two strappes. After having verified ime last one implementation of components, the power transmitter at a voltage of 9 V. Set the adjustable capacitor 4 / 20PF-CA1 to emit in a receiver of silence area. The adjustable resistance 22K-RA1 to adjust the microphone sensitivity.

NOMENCLATURE

1- circuit imprimé
1- micro électret
1-transistor BC318 = BC547 - Tl
1-transistor 2N2219-T2
1- résistance ajustable 22K - RAI
1- résist. lOOR (marron-noir-marron) RI
1- résist. 4.7K (jaune-violet-rouge) R2
2- résist. lOK (marron-noir-orange) R3-R4 
1- résist. 18K (marron-gris-orange) R5
1- résist. 270K (rouge-violet-jaune) R6
1- cond. ajustable 4/20PF CA1 
1-cond. 4.7PF C2
2- cond. 470PF C3-C4 
1-cond.chimi.l0MF/25V RADIAL. C7

2- cond. chimi.2.2UF/25V RADIAL. C:5-C6

1-cond.chimi.l0MF/25V RADIAL. C7 

1 - soudure 1-fil

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