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Category: Inside Circuits Views: 2895 Rank: 10 The Circuit shown can transmit voice to exceptionally good range. Tune trimmer to hear the signal to your near radio. Frequency range is 88-108 MHz. Max current consumption is 30mA. You can power the bug with a 9Volt Battery, or you can plug a power supply to feed in 9-12 Volts.  That bug will pick even a low whisper or even the sound of a breath well far from the microphone. Great spy equipment ;) Datasheet file1: Click here to download 2N2222.pdf datasheet. Datasheet file2: Click here to download BC547.pdf datasheet.
Related circuits Pulse generation by interrupting a light beam This circuit puts out a pulse when an object on the conveyor belt blocks the light source. The light source keeps the phototran-sistor turned on. This produces a high-logic-level voltage at the Schmitt-trigger inverter and a TTL-compatible low logic level at pin 5 of the monostable The oscillator output of the XR-567 can be amplified using the output amplifier and high-current logic output available at pin 8. In this manner, the circuit can switch 100-mA load currents without sacrificing oscillator stability. This amplifier utilizes a 2N6367 and a pair of 2N6368 transistors. The 2N6367 transistor is employed as a driver and is specified for up to 9 W (PEP) output. In the amplifier design the driver must supply on 5 W (PEP) at 30 MHz with a resulting !MD performance of about -37 to -38 dB. At lower... Combined Light-/Dark-Activated Switch Circuit Two op amps used in a bridge circuit configuration detect high and low light levels. Potentiometer R2 sets the dark level and Rl controls the light level. R3 is set so that about lA the supply voltage appears across R4 at the desired light level. 10Mhz Frequency Counter Circuit The circuit consists of an ICM7208 seven-decade counter (Ul), an ICM7207A oscillator controller (U2), and a CA3130 biFET op amp (U3). Integrated circuit Ul counts input signals, decodes them to 7-segment format, and outputs signals that are used to drive a 7-digit display. Integrated circuit U2... Line-operated-power-outage-light This circuit provides emergency lighting during a power outage. The phototransistor should be positioned to maximize coupling of both neon light and ambient light into the pellet, without allowing self-illumination from the 6-V lamp. This mixer is built around a TL072 dual BiFET op amp with a JFET input stage, and can be powered from a single-ended 9-to 18-V power supply. The microphone input is capacitively coupled to the noninverting input of U1a. Resistors R1 and R3 set the voltage gain at about 26 dB and serve as a... This circuit makes a very compact level indicator where a meter would be impractical or not justified due to cost. Resistor values will depend on type of LED used. For MV50 LEDs the resistors are 2 K for steps of approx 2 V and current drain with all three LEDs on of 5 mA FM surveillance BuG Transmitter « Inside Circuits « Free Electronic Circuits ...
Build your own Surveillance Spy Bug. FM Transmitter Bug. No special parts ne...
Comments
wrote on May 26, 2008
tray this to improve range with range and volt,apear
mike wrote on Nov 1, 2009
did enybody test if it works?
spytekpro wrote on Dec 6, 2009
it works fine. power output is 200mW...
joy wrote on Jun 30, 2010
From where do i get mic
and what to say when u buy the mic like (some farad some volts for capacitor)
we don't hav any shelf like thingie to pick from we have to buy from a shop.
sudhu wrote on Jan 27, 2012
does dis circuit amplies evn radio frequecy waves & gives d output?
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