Shown for the 2W audio power amplifier. The circuit uses a 14-pin package LM380 as amplifier element, the input signal by the volume control potentiometer
Click here to download the full size of the above Circuit.
Rp (20k ) and 22 F coupling capacitance to the inverting input of the op amp (pin 6) LM380, the inverting input terminal ( pin 2) to ground, pin 1 external 10 F filter capacitor to filter out high frequency ripple interference, the circuit uses 16V single power supply and power supply terminal (pin 14) to an external decoupling capacitor between ground 470 F , the output terminal (pin 8) has two parallel branches between the ground: a route 2.7 resistor in series with the capacitor 0.1 F, for improving the stability of the circuit, filter out the high frequency portion, to prevent high self-excited oscillation frequency; another branch of the 470 F coupling capacitor Co and load ZL (8 speaker) composition, Co and ZL determines the lower cutoff frequency of the circuit fL. From the figure of the parameters which can be derived lower cut-off frequency is:fL = 1 / (2 ZLCo) = 1 / (2 8 470 10-6) = 42Hz. Clearly, we want to reduce lower cut-off frequency, may be appropriate to increase the value of Co. LM380 voltage magnification at a fixed value 50, the value is determined by its internal feedback circuit, no external components, the maximum output power up to 2.5W, but the larger output power, its power supply voltage ripple interference will increase Great, so the output power is generally used as 2W. The device supply voltage scope is wide: l0 ~ 22V, input impedance is higher: about 150k .
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.....
characters left: