Build your own amplifier audio schematic

This is a collection of pedal schematics. Many are adapted from pre-existing designs, though not all were originally pedals. It's a secret weapon in many rigs, as running it after a distortion or fuzz pedal can produce extra heavy or cutting tones. It does a great job of warming up a thin guitar or brightening up muddy pickups. We sold a bunch of these boards but we will be updating the layout into a more compact form for open source availability.

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Content:

• Build a Great Sounding Audio Amplifier (with Bass Boost) from the LM386
• How to Build the CMoy Pocket Amplifier
• How To Build A DIY Guitar Amp And Get Amazing Tone
• SparkFun Audio Amplifier Kit - STA540
• Stereo Audio Pre-Amplifier Circuit with Bass and Treble Control using Transistors
• How to Build a Car Audio Amplifier
• Audio power amplifier
• Scratch building amps
• Make a Simple Audio Amplifier

WATCH RELATED VIDEO: 🔊 How to make an LM386 audio amplifier circuit

Build a Great Sounding Audio Amplifier (with Bass Boost) from the LM386

I built about a dozen different audio amplifier circuits with the LM but most of them had way too much noise, popping, and other interference. I added a bunch of extra capacitors to reduce the noise, and I added a bass boost control as well to make it sound even better.

But before we start building, it might be helpful to get a little background information first…. The LM is quite a versatile chip. Only a couple resistors and capacitors are needed to make a working audio amplifier. The chip has options for gain control and bass boost, and it can also be turned into an oscillator capable of outputting sine waves or square waves. The actual output power you get will depend on your supply voltage and speaker impedance.

The datasheet has graphs that will tell you. I used a 9V battery for the power supply and it works great, but you can go down to 4V or up to 12V. LM Datasheet. The LM is a type of operational amplifier Op-Amp.

Operational amplifiers have a basic task. In an amplifier circuit, the LM takes an audio input signal and increases its potential anywhere from 20 to times. Gain is the amplification of the input potential and is a characteristic of the amplifier.

Volume lets you adjust the sound level within the range of amplification set by the gain. Gain sets the range of possible volume levels. For example, if your gain is set to 20, the range of volume is 0 to If your gain is set to , the range of volume is 0 to Without a capacitor between pins 1 and 8, the gain will be set to The gain can be changed to any value between 20 and by placing a resistor or potentiometer in series with the capacitor.

In the wiring diagram above, the audio input ground flows through the same path as the audio output ground. The audio input ground is sensitive to any interference and any noise picked up will get amplified through the amplifier.

Make it a goal to keep the input ground separate from other ground paths as much as possible. For example, you can connect the grounds for the power supply, input, and output directly to the ground pin pin 4 of the LM like this:.

This will reduce the distance the input ground flows through the output ground. Keeping the wires as short as possible will also help. A cool feature of the LM is the option to add an adjustable bass boost to the amplifier. The bass boost is basically just a low pass filter, and it removes most of the noise not taken out by the decoupling capacitors.

All you need for the bass boost circuit is a 0. An easy way to connect the audio input in these circuits is by cutting the 3. Check out this article, How to Hack a Headphone Jack to see how to do this with some common types of headphones.

Thanks for reading! Hope you had fun experimenting with these amps as much as I did. Be sure to subscribe to keep updated on our posts as soon as they are published. And feel free to leave a comment if you have any questions or need help with anything in this article.

Great little article, thanks. BTW the number sure do bring a lot of old memories back. My first pc, , 40mhz with 4mb ram. Some how I miss old dos, in some ways it was less complicated back then. Thanks yaboc, glad you liked it. I used the LMN-1, but the setup would be the same for each model, the main difference being the power output.

Sir you can use a 3. Hi Sanjeev, double check to make sure everything is connected properly, and the polarity of the electrolytic capacitors are correct…. Hi I was wondering about this amp are those mono amps? Dear Sir, What will be the maximum power output from this configuration? The p on the schematic is shorted out, both ends to ground. Actually, you want caps at both pins 2 and 3, but for different purposes.

In the schematic shown, disconnect the ground connection on the pin 2 side of the cap, so that the cap can do its job. If you have a scope, try this: With the pf cap at pin 2 shorted to force pin 2 to go directly to ground , input a sine wave and watch it on the scope as you slowly increase the volume. Lo and behold, the one sided clipping has disappeared, and both peaks of the wave are rounded, as they should be!

Now, as you increase the volume, clipping will still occur, but when it does it will be symettrical and will begin at a slightly higher volume. IIn short, this cap gives you slightly more power out of the chip before clipping distortion begins. Thank you for clarifying the doubt with caps on pint 2 and 3. Very informative! Thank you for sharing!

Hi, thanks for nice tutorial. So my question is LM can work with 3. Hi Onur, according to the datasheet, the LMN-1 has the lowest minimum voltage requirement, which is 4 volts… So a 3. As Tuck said, you could use a small boost convertor. You can always take one from a basic portable power bank, as those commonly use LiPo batteries.

You could also look into the PAM for simple boost conversion, or also get the MCP for constant current and temperature regulated charge control. You can also add some protection diodes and daisy chain your batteries together. Will you be kind enough to email it to me? Please send me the schematic diagram. Rayjat51 gmail. I have a question about that 0. And what are the voltages of capacitor that you used?

That capacitor can go either way…no polarity…if the diagram has a capacitor, with a curve in it, it has to be put in the right way…or has polarity.. The reason is that there is always an outer shield, with film caps. In other words, there are two foils that are rolled together and the foil that ends up on the outside should be connected to the negative, because that relatively large area of metal foil picks up interference, which results in noise in an amp.

You need an oscilloscope to measure this. The circuit operates at 9V, so any capacitor voltage rating above about 16V will work fine. The 0. Both are non-polarized. Thank you so much. So well documented and illustrated compared to other tutorials out there. Much appreciated. As an old Pensioner 72 just starting out in electronics I have completed my your first amplifier.

Thanks for an exceptionally clear tutorial. I will now attempt the second version. As a request, would you not like to attempt a oscilloscope using an arduino uno with the same clear instructions Thanks again Roy. I usually just double the voltage for the circuit….

Good day! I just want to ask if you can send me a copy of the schematics because im not used to bread boards which is I am really ashamed of, LOL. I want to rebuild the 1st circuit with the pin 1 connected on the pin 8. And BTW, nice work! Really the gain is very high superb earlier i was thinking to increase the volume.

After seeing this site i wondered LM N-4 is a great chip. Dear Alex the same circuit u can use by connecting pin 1 and 8 with jumper works well with 3. Thanks to circuit basics. I tried even there is clear voice. Hi Alex, this amp works great for headphones… Since the diagrams in the post are mono amps, all you need to do is build two amps, one for the right channel and one for the left channel. I used an 8 ohm speaker, but anything from 4 to 16 ohms will work. Keep in mind though, higher voltage rated capacitors are larger and more expensive….

Do you need a picture of the circuit? Oh btw, i was trying to make the minimal lm aduio amplifier. Cant seem to figure out what is wrong cos i followed the diagram exactly without success. Could you post a link to the video? My problem is that when I try to mount it in its intended case Altoids tin the signal goes out and I get no sound.

How to Build the CMoy Pocket Amplifier

IEEE websites place cookies on your device to give you the best user experience. By using our websites, you agree to the placement of these cookies. To learn more, read our Privacy Policy. Years ago I decided to see how little I needed to spend to build a high-end, audiophile quality, class-D amplifier. I built a worthy little amp, and the article I wrote about it for IEEE Spectrum still attracts page views, and even sporadic emails from people asking where they can get the parts. Sorry folks, the main components are long gone.

How To Build A DIY Guitar Amp And Get Amazing Tone

Amplifiers can come in all shapes and sizes, depending on their bandwidth , power consumption , and many other factors. A Class-D amplifier design is normally used with high fidelity audio systems, and circuits for a Class-D amplifier are not too difficult to build in a schematic. In addition, the banana clip jacks on the breakout board have been replaced with standard 3. This schematic has a lot of components clustered around a single IC, as shown in Figure 1 below. From here, we can place it directly in the blank schematic and start adding other passives in the device. Other passives should be chosen to handle appropriate power output resistors and voltage with appropriate capacitance. As far as assigning designators, you should try to keep them organized, especially if you will be using multiple sheets in your project. I would start assigning reference designators in the upper left corner of the schematic and work my way diagonally across the sheet. You could also replace the connectors with some ports pointing to other sheets if you want to use this circuit within a more extensive system. Here, I could place a differential pair directive if we needed to apply a large number of design rules to multiple differential signals.

SparkFun Audio Amplifier Kit - STA540

The same is true with a tube amplifier except there are not any tube amp schools out there that I am aware of. So you are then left with the only choice. Start reading some books to learn how a tube amp works. Also, visit my amp forum, read the postings there and ask questions.

Stereo Audio Pre-Amplifier Circuit with Bass and Treble Control using Transistors

I did it! I've always wanted to build my own amplifier, and now, finally, I made one. It's my first "serious audio" project ever. Starting this project was daunting to me. There was a gap between buying the parts and actually making the amplifier

How to Build a Car Audio Amplifier

Note: Editable PCB files are available for this project here. The reason for its popularity is due to its very low distortion, minimal external components, and low cost. With the right layout and component selection, you can build an excellent sounding Hi-Fi audio amplifier that will rival high-end amps retailing for several thousand dollars or more. My amplifier is based off of the same circuit provided in the datasheet, with all of the optional stability components included. I highly recommend reading the datasheet before building your amplifier. It has all of the performance specifications, absolute maximum ratings, schematics, and design tips:.

Audio power amplifier

Do-It-Yourself DIY Audio Projects - projects for audiophiles, hi-fi enthusiasts, music lovers, electronic hobbyists, woodworkers and those who like to learn, build and listen to music. This site exists to promote the hobby of DIY Audio. There is nothing for sale here. All project documentation presented on this site is free for personal non-commercial use.

Scratch building amps

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Make a Simple Audio Amplifier

In this article we will learn how to build a simple 3 watt amplifier circuit which can be powered directly from a computer 5V USB port for driving an 8 ohm 3 watt speaker. You can build a couple of such circuits and use them for creating a stereo output into a pair of 8 Ohm speakers. However the present design is based on the IC LM, which is abundantly available let's learn the main features and working of this IC. The following image shows the pinout details of the IC and the available package models, and layouts:. As can be seen in the above schematic, the LM includes a couple of operational amplifiers internally, providing the user the option of configuring the amplifier through a few specified ways. The gain of the first amplifier can be managed externally, while the second amplifier has been wired up internally with an inverting unity gain. We can see that the output of the amplifier 1 is configured to be the input of amplifier 2, allowing both the amplifiers to generate signals with identical values, although these may be degrees out of phase.

An audio power amplifier or power amp is an electronic amplifier that amplifies low-power electronic audio signals such as the signal from radio receiver or electric guitar pickup to a level that is high enough for driving loudspeakers or headphones. Audio power amplifiers are found in all manner of sound systems including sound reinforcement , public address and home audio systems and musical instrument amplifiers like guitar amplifiers. It is the final electronic stage in a typical audio playback chain before the signal is sent to the loudspeakers. The preceding stages in such a chain are low power audio amplifiers which perform tasks like pre-amplification of the signal this is particularly associated with record turntable signals, microphone signals and electric instrument signals from pickups, such as the electric guitar and electric bass , equalization e.