Here are some of the best cr123 battery that you might enjoy.
Audio amplifier with the LM386
Although this post deals with audio amplification, the LM386 is used in many applications such as: computers, guitar amplifiers, radio amplifiers (AM / FM), intercoms, television sound systems, ultrasonic drivers , servo drivers, power converters, etc.
The LM386 has as many configurations as possible as utilities. In this post I am going to show you how to get the most out of it in terms of amplification, connecting it so that it provides the maximum gain in tension.
Once you understand the operation of the circuit, small changes will suffice to adapt this amplifier to any other project.
Basic Characteristics of the LM386
There are several types of LM386 depending on their packaging and model. This time I’m going to focus on the LM386M-1 (because it is one of the easiest to find). Do not worry if your model is different because they all have similar characteristics and just look at the corresponding Datasheet. The features of this device are:
Small IC packaging.
Designed to work with batteries.
It works with a few extra components.
Low consumption (4mA at rest).
It has a wide range of voltages (4V-12V).
Voltage gain from 20 to 200dB.
Typical output power of 325mW (powered with 6V for an 8Ω resistor).
Little output distortion (THD = 0.2%).
Do not worry if you have not understood any of the data you just read. To realize the audio amplifier it is not necessary that you understand them all. Little by little you will become familiar with them (in any case, do not hesitate to ask what you want at the end of the post).
As I have already mentioned, there are many different configurations for the LM386 and in this case you are going to implement a circuit designed to obtain the highest possible gain of this device. There is not much difference (circuitally speaking) with respect to the other basic configurations of this device (except with AM radio amplification) so, if you are able to complete this project, you should not have any problems with the others.
1 x LM386.
1 x Resistance of 10Ω.
1 x 10kΩ potentiometer.
1 x Capacitor of 0.05μF.
2 x Condenser (capacitor) of 10μF.
1 x Capacitor of 250μF.
1 x Speaker.
Normally I show you the circuit diagrams only on a breadboard, very focused to connect them to your favorite Arduino or microcontroller board. In this case it is a project that (apart from providing you with this possibility) you can use it independently or embed in another circuit. For this reason it is interesting that you see (and understand) the electrical diagram.
Diagram of the Audio Amplifier with G 200
To understand this scheme you must take into account several things:
The pins of the LM386 are numbered (like any other integrated), with pin 1 being the one to the left of the mark that you can see in the integrated capsule (usually a semicircle or a small dot) and the last pin (the 8 in this case) is the one on your right.
Pin Configuration of the LM386
Vs is the power of the amplifier (between 4V and 12V) and Vin is the signal you want to amplify (the “song”), that is, it is where the positive pole of your player will go (the negative pole must go to ground).
The “+” that you see next to the symbol of some capacitors indicate that they are polarized capacitors (you can see more in this post) and you must connect them with the positive pole in the direction in which that mark is.
A priori I do not see any other element that can give you problems when connecting it (the potentiometer can be connected using different configurations to modify how the volume of your audio amplifier increases) but if you have doubts you just have to ask me.
Assembly in Breadboard
In case the previous scheme has been a little messy I hope that this image serves to make you a little clearer how the assembly of the audio amplifier is done.
This audio amplifier is designed to play mono sound although it is possible to adapt it.
If you are going to connect this circuit to your mobile, mp3, etc. It would be a good idea to get a 3.5mm Jack connector.
You must be careful when selecting the components. Make sure that they support the voltage that you are going to apply and that they can dissipate that power (since it is a circuit that works with small power values, in principle you should not have problems with almost any element).
If you do not find any component of exact value to that of the scheme, use the closest commercial model.
The gain will depend on the power you put to the system (Vs) and the impedance (resistance) of the speaker.
If you do not see yourself capable of carrying out this