Telephone Surveilance Bug Circuits
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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.... -
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. I do however, receive many requests for a higher powered circuit and.... -
Here is a simple yet very useful circuit which can be used to eavesdrop on a telephone conversation. The circuit can also be used as a wireless telephone amplifier. One important feature of this circuit is that the circuit derives its power directly from.... -
FM Telephone 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... -
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... -
If you ever wondered how those phone bugs from spy movies work, here is the schematic for your very own. This simple FM transmitter uses a phone line to both power the device and receive the audio signal. Just hook it up to the phone line you want to monitor.... -
A simple telephone transmitter circuit that is ideal for transmitting the telephone conversation through small distances. The circuit is very simple and uses only few components. The entire circuit can be easily included in the telephone itself or in the.... -
Small telephone bug. Listen telephone line on your FM receiver. It is self powered. Small part count. Circuit diagram, schematics, electronics project.... -
A very simple telephone broadcaster or transmitter which can be used to eavesdrop on a telephone conversation. The circuit can also be used as a wireless telephone amplifier. One important feature of this phone transmitter is that the circuit derives its....
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New Circuits
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This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of.... -
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is.... -
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to.... -
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This.... -
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the.... -
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,.... -
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the.... -
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power.... -
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
This circuit charges the battery at 75 mA battery can be left in the charger indefinitely, until...
In the wiper-delay schematic shown, with the ignition on, Dl maintains regulated +12 Vdc. When...
This circuit consists of a tri-color LED, a resistor, wire, and a coin-size test plate. You will...
This is transistor inverter circuit diagram 100watt it sizes are easy circuit. Because of use the...
This is a small general purpose audio test set. It comprises a low 0. 3% distortion phase shift...
From the discussion made so far on the filters, it may be concluded that in the stopband the gain...
The material is presented in a manner suitable for a teaching tool. It seeks to enlighten and to...
Using the LM628 LM629 dedicated motion-control processors can be designed a variety of DC and...
Solar/battery powered FSK transmiter regarding power supply section, including battery...
The module costs GB38. 00 and the transducer costs a further GB17. 00. In fairness, the Polaroid...
The one-arm bandit circuit is made up of three clock circuits and three counter/readout circuits....
An adaptable siren generator circuit with a multitude of uses is shown. It is based around a 556...
Adjustable Gain Test in preparation isolation amplifier circuit as shown below, the use of...