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3 Transistor FM Radio Bug |
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3m 100 MHz small bug |
Bug Detector (mini) - This project is a handy
piece of TEST EQUIPMENT. You can never have enough
assistance when designing FM bugs. The first thing
you need to know after putting a bug together is the
fact it is transmitting.
This project gives you this indication. Once you
know a bug is transmitting, you can work on getting
the best output power and adjusting the frequency to
a blank spot on the dial. |
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Bug Detector with Beep |
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Crystal Locked FM Bug - Producing a crystal
locked transmitter is a natural extension to our FM
Bug series. We have already produced a number of
simple FM devices, (without the use of a crystal)
and showed how the power and frequency depends on a
number of factors including the voltage of the
supply and the design of the stages. |
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Electronic Eavesdropping Devices Detector -
Copyright of this circuit belongs to smart kit
electronics. In this page we will use this circuit
to discuss for improvements and we will introduce
some changes based on original schematic. |
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FM Bug 1.859.telia |
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FM Telephone Bug (Tony van Roon) |
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FM Telephone line Bug Transmitter (Aaron Cake) |
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FM Transmitter Bug - This small transmitter uses
a hartley type oscillator. Normally the capacitor in
the tank circuit would connect at the base of the
transistor, but at VHF the base emitter capacitance
of the transistor acts as a short circuit, so in
effect, it still is. |
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High Power FM Microphone FM Bug - My FM Wireless
Microphone has been a very popular project with
beginners and experienced constructors alike. It has
been used inside guitars and as the basis of a
remote control system. |
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Infinity Bug - This project requires a high
degree of soldering. It uses surface-mount
resistors, capacitors transistors and diodes. It
can only be assembled on the PC board supplied… |
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Miniature FM Spy Mic - This spy mic works from
single 1.5 volts AA type battery cell. It is highly
sensitive and has a range of 300 meters. You can use
any HF transistor with cut-off freq. >300 MHz for Q.
Use electret mic. |
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Simple Phone Tap (Aaron Cake) |
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Surveillance Transmitter Detector - This circuit
can be used to "sweep" an area or room and will
indicate if a surveillance device is operative. The
problem in making a suitable a detector is to get
its sensitivity just right, Too much sensitivity and
it will respond to radio broadcasts, too little, and
nothing will be heard. |
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Telephone Listening Bug - Here is a simple
transmitter that when connected to a phone line,
will transmit anything on that line (except the dial
tone) to any FM radio. The frequency can be tuned
from 88 to about 94Mhz and the range is about 200
feet. It is extremely easy to build and is therefore
a good, useful beginner project. |
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Three Transistor FM Radio Bug |
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Vibrating pocket bug detector |
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Wireless Telephone Bug - Here's a neat little
project that will allow you to monitor your phone
line as soon as your phone is off hook. You can use
a regular FM broadcast band radio to monitor the
conversation. |
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Wireless Telephone Eavesdropper Electronic Circuit
- The IR transmitter connects to a telephone
circuit, and transmits both sides of all telephone
conversations to any line-of-sight location, within
40 feet. No power is taken from the central office,
as long as all phones remain on-hook. The current
flows through the phone and back to the central
office. |
