Amplifier Circuit Diagrams – Power, Preamp & Tone Control

Here is Understanding Power Amplifier Circuits for Beginners – Step-by-Step Learning Hub. Are you looking for a power amplifier circuit to be used in your hobby?

It might take a while, but surely you have limited time. Don’t feel down just yet. I have compiled a list of power amplifier circuits ready to be made. There are around a hundred different circuits grouped into various sub-types to be easy to find.

Note: Please consider it carefully, before you buy the parts to build the circuits. Because some circuit is not beginner-friendly.

My Experience with High Amplifiers

I was interested in electronics when I was about 9 years old. But my family had a difficult time at that time; my mother was in the early stages of cervical cancer, though she has now recovered through the use of herbs and vegetarian food.

At that time, I became very interested in amplifier circuits because almost everyone likes to listen to music. The first circuit I got was a car’s radio tape player. But I can’t turn on the music too loud because my mother doesn’t like it, and I want her to be comfortable, so I turned to testing the power supply circuit instead. It became my deep-seated dislike of large amplifier circuits.

However, I still like to collect audio amplifier circuits, although some may not work so well and I haven’t tried them yet, I cannot confirm that it will work.

But if you love to learn electronics. It will surely be a good experience.

Look at it below!

Small Power Amplifier circuit Under 20 watts

They are suitable for small applications. For example, to increase the output of melody sound, for experiment Electronics learning.

LM386 Audio Amplifier Circuit

It was my first mini audio amplifier. Many people also use it. Because it’s easy to build and this IC always popular. And suitable for a 9V battery or 3.7V Li-ion battery with as little current. This was my first ever amplifier circuit. With an amplification gain of up to 0.5W.

It is sufficient for a small work corner or small room very well and easy to build. Even assembled on a breadboard, it still performs well. Almost forgot, the largest speaker size I have ever tried is 10 inches, it still has a soft and sufficient sound. But the recommended size is no more than 6 inches.
Check out the full guide → LM386 Audio Amplifier Circuit

---

• 2W+2W Stereo using 3 LM386 Here is an LM386 stereo audio amplifier circuit, 2 watts. Using 3 ICs in a bridge model. It is cheap and easy to build for a beginner.
• 15W Multi-Purpose TDA2030  This IC is popular all the time. Because of small and cheap. This is a Mono Model. It’s enough for a normal room.
• 1.2W, Super Small, TDA7052 Tiny stereo audio amplifier for mobile or Ipad. Even a 5v audio amplifier circuit diagram. It helps you to use a AA 1.5V battery x2 (3V) to run a power amplifier.
• TDA2822 Stereo Amplifier This is a stereo power amplifier. People like TDA2822. Me too. Why? Find the answer yourself.
• 20W Integrated Amplifier, TDA2005 with tone control. The easy circuit uses a 12V supply.
• TDA820, Mini Stereo Amplifier, 2W+2W  It is an alternate tiny amplifier chip. Only a single IC gives a power of 2 watts max on 8 ohms. more than LM386. You will listen to music louder.
• 3 transistor amplifier circuit: How to design simple transistor amplifier circuit in OTL Mode.
• 4-transistor audio amplifier circuit This is a 4-transistor complementary push-pull amplifier, that shows the basics of audio amplifier design.
• Simple power amplifier circuits There is a small power amplifier circuits using a few components and low volts power supply. It may good idea to learn your electronics.

Mini Amplifier 20W to 50W

Between 20W to 50W range—If you are young. You will like this list. Imagine when you listen to music in your room. It is so happy!

• 30W RMS integrated AMPs—The integrated amplifier that is smaller. For listening in a small room. Must have good sound quality. Low noise and cheap.
• 35W BCL AMPs using  TDA2030
• TDA2030 Stereo OCL Amplifier
• 40W Classic OCL Main AMPs—using 2N3055+MJ2955
• 30 watts Simple OTL Amplifier, TDA2030 & transistors If you are looking for a power amplifier for listening in a small house. This may be a good choice for you. It is a TDA2030 transistor amplifier.
• LM1875, Tiny Amplifier 30 watts Imagine Your house is mini or you are a beginner or getting a hurry. You love music and want a hobby with Electronics. How do you make me feel better? You should build a tidy amplifier. Use LM1875 circuits.

Best for Home 50W to 100W

Imagine you are watching a movie with your family. Sound power is very realistic with these circuits.

• 35W to 75W Stereo AMPs—TDA2050**new**
• 50W, OCL Main amplifier—LF351, 2N3055, MJ2955
• 2N3055 Amplifier circuit
• 55W RMS OTL integrated AMPs build easily
• Super Bridge using TDA2030 (at 2Ω speaker)
• Tri-Band Amplifier Circuit Project
  The tri-power amplifier circuit has three in one an amplification act drive specifically each audio speaker. It makes the sound quality is very good.

12V CAR Audio Amplifier circuits

All used in a car or in a house with a 12V DC power supply. Some circuit requires high current. Most use an IC chip. So easy and small. 

1. 50W BCL Car Audio using TDA1562
2. 40W Mini Audio
3. LM383 Power OTL 5.5W
4. Small IC circuits for speaker

Note: All in all, you can use this small amplifier, too.

PreAmplifiers & MIC Non Tone Controls

1. 4 Preamplifier Using Transistors
2. 3 Universal Preamplifiers Using IC
3. Transistor Stereo Bass Booster
4. Microphone Preamplifier 2 CH
5. Low Noise Microphone preamplifier
6. Dynamic Microphone Preamplifier using Transistors
7. Stereo Noise Filter

Tone controls & Graphic equalizers

1. 7 Classic low noise tone control circuits using transistors
2. Hi-Fi preamplifier with tone control**new** Low distortion. Use low noise transistors Frequency response 20Hz-20KHz
3. Bass Treble Active tone control
4. Passive Tone Control, Non-IC & transistors
5. Top 5 circuits of NE5532 Preamplifier tone control If you want to avoid noise in the audio system you should try this. It uses NE55532, LF353, and more.
6. Top 3 Graphic Equalizers —Low noise, Cheap, and easy
7. TDA1524 stereo tone control
8. Super Bass Booster It is a small circuit diagram. Using popular op-amps, 741, LF351, or more. And use a single power supply.
9. Audio Loudness control

Audio Mixers, Filters, and Converters

1. Micro Mixer
2. Linear opto isolator
3. Add Dimensional sound from 2CH to 4CH
4. The cheap & small hearing aids project

Audio Controllers & Protection Circuits

1. Simple delay speakers
2. Speaker protection
3. Tweeter speaker protection