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3 Transistor FM Radio Bug - (electronic Circuit / Schematic added 10/04) |
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3m 100 MHz small bug - (circuit added 05/06/07) |
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. (schematic added 04/09) |
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Bug Detector with Beep - (Tony van Roon's electronic circuit added 05/06/07) |
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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. (electronic circuits 04/09) |
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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…..(design
idea circuit added 09/08) |
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FM Bug 1.859.telia - (electronic circuit added 4/05) |
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FM Telephone Bug (Tony van Roon) - (electronic design added 6/07) |
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FM Telephone line Bug Transmitter (Aaron Cake) - (circuit / schematic design added
7/03) |
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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. The coil ....designed by David Sayles (electronic
design added 6/07) |
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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. ….(circuit added 04/05/06) |
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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…(circuit 02/07) |
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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. (added 6/06) |
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Simple Phone Tap (Aaron Cake) - (electronic circuit added 7/03) |
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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 (execpt 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.
….(design added 11/08) |
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Three Transistor FM Radio Bug - (schematic / circuit (added 6/03) |
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Vibrating pocket bug detector - (schematic / circuit added 08/08/08) |
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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. Just remember, it ….(circuit design
added 03/08) |
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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....(electronic design added 6/07) |
