One incredibly simple solution to getting more sound from a micro controller is the LM386 series of amplifier chips. These can give project quality audio for less than a dollar. They even make a passable one dollar MP3 docking station and are the basis of the `little gem` guitar amplifier. The datasheet for the LM386-N4 which I am using provides s
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ome example circuits but these require non standard capacitors - by non standard I really mean that most of us keep `decade` capacitors meaning the tens - 0. 01uf, 0. 1uf, 1uf, 10uf, 100uf. The sample circuits require 250uf and 0. 05 uf capacitors. As I didn`t have these values, I built the sample circuits with 100`s in series and 0. 1`s in parallel to get 200uf and 0. 05uf. After playing with the circuit for a while I removed the series and parallel capacitors leaving just a single 100uf and one 0. 01 uf capacitor. This variation of the recommended circuit works perfectly well, and is now included in the built version of the RCArduino Lap Timer. So for a super simple chip to add quality sound and volume to a project order a few LM386N4`s its amazing how many projects can benefit from bigger sound when its as easy as this. Caution : The new generation of 32 Bit ARM chips used by the Arduino Due are less able to sink and source current than the AVR Chips used in the 8-bit Arduinos. A number of users have reported burnt out DAC (Digital To Analog Converter) outputs while using the Arduino Due. It is suggested that a series current limiting resistor should be used between the Arduino Due DAC Outputs and external circuitry. There are currently a number of topics covering the Arduino DAC outputs and pin protection in general on the Arduino Due forum - Update: The first video is my own Auduino, any others I post are enhanced...
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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