Telephone Call Recording Circuit Circuit
Posted on Dec 21, 2012
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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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The circuit consists of three stages, an electret microphone, an audio amplifier and an RF...
This circuit is operating the room illuminates. The basic component of the circuit is a IC1...
One yet circuit with the known LM3915. It does not differ in a lot of points from other...
The timer circuit shown gives independent control of the output"s on and off intervals, which can...
A four output Hall sensor combined with a few logic gates produce this digital compass. The NOR...
This is the 200W lamp flasher circuit diagram. The frequency/speed of the lamp flashing can be...
This circuit is IC controlled emergency light. This series of automatic switching-on of the...
Here is a schematic of a good quality AM radio receiver circuit. The heart of the circuit is...
If you are looking for a micro mixer circuit that create a simple, affordable, small and compact,...
This high voltage generator can generate stable high voltage above 8kV. Its circuit is simple. It...
By ASIC it is a flashing light string web dig troller, which has four outputs; single key cycle...
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