How to make an audio amplifier using just one mosfet transistor
An audio power amplifier (or power amp) is an electronic amplifier that strengthens low-power, inaudible electronic audio signals such as the signal from radio receiver or electric guitar pickup to a level that is strong enough for driving (or powering) loudspeakers or headphones. This includes both amplifiers used in home audio systems and musical instrument amplifiers like guitar amplifiers.There are lots of circuit diagrams out there but we have selected the easiest one that has a mosfet transistor.
Step 1: Simple Power Amplifier Circuit
Simple power amplifier circuit components
Power amplifiers make the signal—whether it is recorded music, a live speech, live singing, an electric guitar or the mixed audio of an entire band through a sound reinforcement system—audible to listeners. It is the final electronic stage in a typical audio playback chain before the signal is sent to the loudspeakers and speaker enclosures.
Poweramp components :
Mosfet transistor IRFZ44N
Capacitor 440v 30mF(not crucial)
Speaker+Jack cable+power supply(5v-9v)
Step 2: Jack Audio in Cable Connection
In order to make the audio input for our audio amplifier we have to make the connection from the audio into our amplifier, for this, we will need a jack mono/stereo cable.How to find the correct cable connection is very simple
this type of cables from bottom to top have layers divided by some small black strips.Now on the bottom part and also the bigger part is the ground or negative terminal, and the rest is positive or signal left and right if is a stereo cable.For this you will use the multimeter in the continuity selection and from each metal connection of the jack audio cable to the opened wires wi will find which one is which.
Step 3: Audio Amplifier Circuit Using Mosfet Transistor
You have the circuit diagram of a simple audio amplifier using a mosfet transistor and the representation of each electronic components and the connection between audio in and speaker audio out.
While power amplifiers are available in standalone units, typically aimed at the hi-fi audiophile market (a niche market) of audio enthusiasts and sound reinforcement system professionals, most consumer electronics sound products, such as clock radios, boom boxes and televisions have relatively small power amplifiers that are integrated inside the chassis of the main product.
Step 4: Audio Amplifier Sound Test
Let's make a sound test in the video linked you will find the sound test of our homemade audio amplifier with simple electronic components, now this is not going to replace your home system or subwoofer this is just the practical application and demonstration of an audio amplifier in its primitive form.
The audio amplifier was invented in 1909 by Lee De Forest when he invented the triode vacuum tube (or "valve" in British English). The triode
was a three terminal device with a control grid that can modulate the flow of electrons from the filament to the plate. The triode vacuum amplifier was used to make the first AM radio. Early audio power amplifiers were based on vacuum tubes and some of these achieved notably high audio quality.
Thanks all for participating and please check the video for more details and practical representation of this primitive Audio Amplifier circuit i hope you will see the practical and simplicity of the project and not so the errors if you want more electronic projects visit NoSkillsrequired youtube channel.