This topic covers a resonant equalizer which is a different style circuit than the common audio equalizer, although both produce the same result. The difference here is that the frequency response of both the high and low frequency equalizer covered on the previous page overlap each other. Notice how the capacitor placement for the high-pass equa
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lizer and the capacitor placement for the low-pass equalizer are used in this circuit design. This circuit is also sometimes called a universal equalizer, because by changing or adding the capacitors any of the three equalizer responses can be produced. Although this schematic only shows one possible example, the other two were shown in the previous design. The circuit design is almost identical to the unity gain 741 circuit used before. The only difference is the addition of the second capacitor to the circuit schematic. As with all these circuits, the general purpose LM741 is only used to represent almost any operational amplifier. Also see Manufacturers of Op Amps. This circuit basically combines the low and high pass filters, similar to circuits found on the Passive Tone Control page, or the Active Tone Control page. The low and high frequency points are combined and placed symmetrically above and below center resonant frequency. The resonant equalizer functions around a particular center frequency and than adds gain or attenuation above or below that frequency. However the response only effects a certain range above or below the center frequency, as shown in the graphic. Which appears just like a bandpass filter, with the additional characteristic of both gain and attenuation control. As shown in the graphic to the right the boost an cut are symmetrical. The high frequency [Fh] 3dB point and the low frequency [Fl] 3dB...
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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