That hum noise is produced by electronic device with improper design, yes you`re right. And you might choose to solve the trouble maker, the source. You begin to check the grounding, the cabling, casing, and many more things you can do to eliminate the hum heard from your amplifier. You might put yourself into a trouble if the hum can`t be elimina
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ted and you don`t realize that the source is not come from your equipment that you have the access to fix it. For the source come from mp3 player powered by you AC to DC adapter, you might check for the ripple from your power adapter and fix it by adding a good regulator. If you find that the source is coming from your television audio output or from your desktop PC sound card, and you don`t want to thinker them, then the circuit in this article would be very helpful. The circuit is a notch filter, a filter that remove a spot (or a very small) area in the frequency domain. Ideally the notch filter remove only a single frequency, but practically it also attenuate other frequency around the spot. The circuit is based on inductor simulation using active component (op-amp). The equivalent inductor value simulated by this circuit is R2xR4x(C4+C5). You can replace the circuit in the dashed box by a single component: an inductor. Here you find that small component count in electronic circuit design is not always good, because you need an inductor with 150 Henry to replace the simulator circuit to notch out the 50 Hz signal, it`s hard to imagine how big its size and how expensive its price is. Make sure that C2 and C3 are placed as close as possible to the op-amp power (Vcc and -Vcc) pins to stabilize the supply from glitch noise. You should adjust R6 potentiometer slowly to set the cut frequency at your power line frequency. The...
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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