Fig. 3 - PCB - 1W Amplifier for Stereo Headphone with IC TDA2822M

Simple headphone amplifier with few external components that is easy and inexpensive to assemble. This IC is designed for amplifying portable devices such as CD players, portable radios, small speakers, etc.

First of all, we will use it to amplify the audio signal for headphones, that is, we will build a headphone amplifier, whether to listen to music from a mobile phone, connect instruments to study, such as electric guitar, bass guitar, ukulele, guitar, or any other audio signal that needs to be amplified. 

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• 24W Stereo Hi-Fi Audio Amplifier using TDA2616 + PCB
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• 100W RMS Audio Amplifier IC TDA7294 + PCB
• 200W RMS Stereo Power Amplifier with IC STK4231II + PCB
  
  

The main component is the TDA2822, a monolithic integrated circuit in an 8-pin lead  Mini-dip package. It is intended for use as a dual audio power amplifier in portable audios.

FEATURES

• Dual Low-voltage power amplifier 
• Supply voltage down to 1.8V 
• Low crossover distortion                                
• Low quiescent current z Bridge or stereo configuration

Fig. 2 - 1W Amplifier for Stereo Headphone with IC TDA2822M

Fig. 1 - PCB  68W Hi-Fi Audio Power Amplifier - IC LM3886T

The LM3886 is a high-performance audio power amplifier capable of delivering 68W of continuous average power to a 4Ω load and 38W into 8Ω with 0.1% THD+N from 20Hz–20kHz. 

The performance of the LM3886, utilizing its Self Peak Instantaneous Temperature (°Ke) (SPiKe) protection circuitry, puts it in a class above discrete and hybrid amplifiers by providing an inherently, dynamically protected Safe Operating Area (SOA). 

SPiKe protection means that these parts are completely safeguarded at the output against over-voltage, under-voltage, over-loads, including shorts to the supplies, thermal runaway, and instantaneous temperature peaks. The IC pinout is shown in Figure 2 below.

Fig. 2 - Pinout IC LM3886T

The LM3886 maintains an excellent signal-to-noise ratio of greater than 92dB with a typical low noise floor of 2.0μV. It exhibits extremely low THD+N values of 0.03% at the rated output into the rated load over the audio spectrum, and provides exceptional linearity with an IMD (SMPTE) typical rating of 0.004%.

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Features

• 68W cont. avg. output power into 4Ω at VCC = ±28V
• 50W cont. avg. output power into 8Ω at VCC = ±35V
• 38W cont. avg. output power into 8Ω at VCC = ±28V
• 135W Instantaneous Peak Output Power Capability
• Signal-to-Noise Ratio ≥ 92dB
• An Input Mute Function
• Output Protection from a Short to Ground or to the Supplies via Internal Current Limiting Circuitry
• Output Over-Voltage Protection against Transients from Inductive Loads
• Supply Under-Voltage Protection, not Allowing Internal Biasing to Occur when |VEE| + |VCC| ≤ 12V, thus Eliminating Turn-On and Turn-Off Transients
• 11-Lead TO-220 Package

The Power Supply

Fig. 3 - Schematic  68W Hi-Fi Audio Power Amplifier - IC LM3886T

Fig. 1 - PCB 40W Stereo Car Amplifier TDA8560Q

This is a super easy to build Stereo Car Audio Power Amplifier circuit, due to the number of external components being few, it makes this amplifier quite viable for those who want to build a power amplifier and super simple and quick to do.

The TDA8560Q is an integrated Class-B output amplifier in a 13-lead Single-In-Line (SIL) power package.

This Car Audio Amplifier Circuit gives an output power 2×40W / 2 Ω in BTL configuration. The device is primarily developed for car radio applications.  

The TDA8560Q contains two identical amplifiers and can be used for bridge applications. The gain of each amplifier is fixed at 40 dB. Special features of the device are as follows.

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Mode select switch (pin 11)

• Standby: low supply current (<100 µA)
• Mute: input signal suppressed
• Operating: normal on condition.

Since this pin has a very low input current (<40 µA), a low cost supply switch can be applied. To avoid switch-on plops, it is advised to keep the amplifier in the mute mode during ≥100 ms (charging of the input capacitors at pin 1 and pin 13).

The schematic diagram of the Car Amplifier Circuit, is in Figure 2 below, it is a very simple circuit to build, with few external components, however, it is a very powerful circuit, which provides 80W in two 2 Ohms Speakers.

Fig. 2 - 40W Stereo 14.4V Car Audio Power Amplifier - IC TDA8560Q

The operating voltage of this circuit can vary between 6V to 18V DC, which opens the possibilities of use in amplifier for; Residential Sound, Car Stereo, Boombox, Computer Speaker, among other types of portable audio amplifiers ... Since it has a common power supply and low power voltage, this circuit amplifier is ideal for these purposes.

Components List

• U1 ..................TDA8560Q Integrated Circuit
• R1, R2, R3 .... 10K ohms - 1/8 W Resistor - (brown, black, orange, gold)
• C1, C2 ........... 470nF Polyester Capacitor
• C3 .................. 47uF - 35V Electrolytic capacitor 
• C4 .................. 2200uF - 35V Electrolytic capacitor
• C5 .................. 100nF Ceramic Capacitor
• RP1, RP2 ....... 20K ohms Potentiometer 
• JP1, JP2 .......... Female RCA Connectors to PCB
• P1, P2, P3 ....... PCB Terminal Blocks
• Others ............. Wires, Welds, Posts, PCB, Etc.

We are making available the files containing the PCB, the Schematic Diagram, the PDF, GERBER, and JPG, and providing a direct link to download for free in a direct link, "MEGA".

Direct link to download

Click in the link  to download the Files: PCB Layout, PDF, GERBER, JPG

If you have any questions, suggestions or corrections, please leave them in the comments and we will answer them soon.

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Fig. 1 - Printed Circuit Board Amplifier 100W with TDA7294

Integrated Circuit

Characteristics

• Wide range of supply voltage (± 10V to ± 40V)
• DMOS output amplification step
• High Output Power (Musical 100W)
• Mute and Stand-by functions
• Very low harmonic distortion
• Short circuit protection
• Thermal protection with automatic shutdown
  
  

Fig. 2 - Schematic diagram 100W RMS Audio Amplifier IC TDA7294

List of materials

• U1 .................. Integrated Circuit TDA7294
• R1, R3, R4 .... Resistor 22K (red, red, orange, gold)
• R2 ................. Resistor 680Ω (blue, gray, brown, gold)
• R5 ................. 10K resistor (brown, black, orange, gold)
• C1 .................. Electrolytic capacitor 1.5μF - 35V
• C2, C3 ........... Electrolytic capacitor 22μF - 63V
• C4, C5 ........... Electrolytic capacitor 10μF - 63V
• P1, P3............. 2-Pin Card-to-Cable Connector
• P2 .................. 3-Pin Card-to-Cable Connector
• Others ............ Printed Circuit Board, tin, wire, etc.