Descrition & Circuit
This project is taken from www.electronics-lab.com.With some modification, I create my own version of FM Telephone bug complete with stripboard layout.
Theortically, the frequency range is from 88MHz to 94MHz but you may experiment with the coil structure to tune it
Circuit | Strip Board Layout |
Parts List
| Diode | IN4384 | 4 |
| LED | 1 | |
| Resistor | 12k | 1 |
| 1k | 1 | |
| 200R | 1 | |
| Capacitor | 470p | 1 |
| 330p | 1 | |
| 25p | 1 | |
| 12p | 1 | |
| Transistor | A933(PNP) | 1 |
| Coil | *See note | 1 |
7 or 8 turns of 22AWG(diameter .6mm) around 9/64inch(3.6mm) drill bit. Antenna using the same wire 22AWG, 5inch long
Picture
Compact! | With antenna! |
Put it online! | Get ready to tune your radio! |
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