Microphone FM bug transmitter
Posted on May 25, 2012
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.....
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This type of reset pulse is ideally provided by this circuit. Because of the high input...
Electrodes are immersed in an electrolyte that remains level while the sensor follows the tilt of...
A current source that attains a resolution as low as 10 pA is useful in applications where a...
This is a project that I always wanted to do, but managed to put off for a long time. It has been...
Actually this part of the circuit is isolated from any other component (except via 5v & ground)....
8 solid-state-relay (SSR) and ADAM-4068 (Serial-I/O device) and ask me to wire a circuit to...
A negative output voltage dc to dc converter generates a -5V output at pin A. In order to...
This circuit operates an automotive windscreen washer pump to fill a 20-litre drum from a...
A simple telephone transmitter circuit that is ideal for transmitting the telephone conversation...
As more and more of the world becomes concerned with conserving electric power and the fuels that...
This circuit allows a smaller control voltage to inversely linearly control a larger output...
This phone is loud ringing tone circuit for generating the electricity bell in the old telephone....
This page serves as documentation for the circuits that I have built which make use of the...
It shows the dynamic AC signal level display drive circuit can be used for audio level display...
220V AC by VDl a VD4 bridge rectifier, resistor Rl0 buck regulator VD5 regulator and C2, after...
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