Circuit Schematic Diagram Of Mini Fm Bug Detector - the following mini fm bug detector circuit diagram is based on a broad band receiver it can be put together in less than an hour this circuit provides a very valuable piece of equipment to help when fm transmitter is built transmitting bug system can be found easily using this circuit it gives whistle sound as a feedback when it swept near a bug source this fairly simple circuit makes it possible to place such a wall as a conduit to locate it is a conduit for power no water or gas seeker the only requirement is that there is tension on the line but i want to power up a rf detector circuit with 12v detect signals of about 433mhz 400mhz 500mhz and give a sound during detection sensitivity to about 12m could you assist me please a schematic maybe i would really appreciate it thank you fm bug spy transmitter circuit take a look at this fm spy transmitter which can be used as a bug transmitter.

or as diy fm bug too it uses a single ic 74f13 one coil a capacitor one trimmer one resistor and ofcourse one electret mic circuit diagram for rf signal detector to identify the presence of rf signal noise this circuit helps a lot construction and working this circuit constructed with lm386 operational lifier with transistor pre lifier using bc550 if you want to detect high frequency rf noise means you should pre lify the noise signal the speaker connected to the output of op gives sound indication while the circuit so there you have it a nice little fm bug detector you can use to find fm bugs the antenna can be stored in the right hand side of the tin and pulled out as needed pair this with my the antenna can be stored in the right hand side of the tin and pulled out as needed circuit diagram this will upset the balanced input of ic1 and convert the current into the corresponding.

output voltage capacitor c4 along with high value resistor r1 keeps the non inverting input stable for easy swing of the output to high state the lc is the oscillator its self a k a tank circuit it operates on a resonance frequency given by the formula btw i would suggest getting a frequency counter from ebay its pretty cheap so you can tune your fm receiver at that frequency and you dont have to get a variable cap for that



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