Fig. 1 - 100W RMS Power Amplifier using 2 NPN 2SC5200 Output Transistors + PCB

For Portuguese version, click here!

We usually have amplifiers with complementary outputs on most amplifier designs, and in a vast majority of amplifiers, it's quite normal to use the complementary NPN 2SC5200 transistors in conjunction with the PNP 2SA1943.

This type of amplifier is very common and good quality, because these transistors are specific for high fidelity amplification.

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We'll build an amplifier circuit that uses the same concepts as two output transistors, but we will use two NPN 2SA5200 output transistors. Which is very interesting for those who like to test other types of transistors to evaluate the quality, distortions, powers. Etc.

The schematic diagram is in Figure 2 below, it is a simple amplifier, it has a satisfactory quality.

Fig. 2 - 100W RMS Power Amplifier with 2 NSC 2SC5200 Transistors at Output

Power Supply

The power supply consists of a symmetrical transformer 32V - 0 - 32V center tape, with a current of 5 Amperes, a lower current, up to 3 Amperes minimum, can be used, which will play without any problems.

Nothing prevents you from using a higher or lower voltage, as this amplifier has a tolerance for the supply voltage, and can normally play “with small attenuation in the output power” with voltages ranging from 18V to 55V without too many difficulties.

It also has great stability, and we can use, if you have, a SMPS power supply, and this is clear with Center-Tape, that is to say a power supply with central socket.

Component List

• Q1, Q2 ............... Transistor A733
• Q3, Q4 ............... TIP41C transistor
• Q5 ...................... TIP42C transistor
• Q6, Q7 ............... 2SC5200 Power Transistor
  
  
• D1, D2, D3 ........ Diode 1N4007
  
  
• C1 ....................... 0.47uF Polyester capacitor 
• C2, C4, C5 .......... 47uF - 63V electrolytic capacitor 
• C3 ....................... 100nF ceramic / polyester capacitor 
• C6 ....................... 150pF ceramic / polyester capacitor 
• C7, C8 ................ 1nF ceramic / polyester capacitor
  
  
• R1 ....................... 22k ohms resistor (red, red, orange, gold)
• R2 ....................... 15k ohms resistor (brown, green, orange, gold)
• R3, R7 ................. 680 ohms resistor (blue, gray, brown, gold)
• R4 ....................... 33 ohms resistor (orange, orange, black, gold)
• R5 ....................... 560 ohms - 1W resistor (green, blue, brown, gold)
• R6 ....................... 56k ohms resistor (green, blue, orange, gold)
• R8, R9 ................ 4.7k ohms resistor (yellow, violet, red, gold)
• R10 ..................... 10 ohm resistor - (brown, black, black. gold)
• R11 ..................... 120 ohms - 1W resistor (brown, red, brown, gold)
• R12, R13 ............ 100 ohms - 1W resistor (brown, black, brown, gold)
• R14, R15 ............ 0.47 ohms - 5W resistor (yellow, violet, silver, gold)
  
  
• Others ................. PCB, Heat Sink, Loudspeaker, Wires, Solders, Etc.
  
  

For those who want to download materials such as the schematic diagram in PDF, PCB Layout,  GERBER and JPG, we are providing a direct link to download all the material.

Direct link to download

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

Fig. 1 - PCB 200W RMS Stereo Power Amplifier IC STK4231II

STK4231 is a Thick film hybrid IC two-channel  100W min AF Power Amp, manufactured by SANYO ELECTRIC CO. LTD JAPAN. The STK4221II IC is a dual high power amplifier chip, preferably suited for compact high power audio applications, it provides 2 channel high power best quality audio output of 100W RMS at both channel at 8Ω speaker.

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Features

The STK4201II series are pin-compatible in the range output of 60W to 100W, are 22 pin SIP (Single Inline Package) IC with a special case designing for operation at more heat dissipation to generally reduce external heat sink. 

But use a heat sink for protection. This IC is generally used in the home microsystem, car audio. The real IC image is shown below in Figure 2.

Fig. 2 - Pinout of IC STK4231II

Fig. 3 - Schematic 200W Stereo power amplifier IC STK4231II

Components List

• U1................................. STK4231II – Audio Amplifier Integrated Circuit

• R1, R2, R8 ................... 1K ohms - 1/8 W – brown, black, red
• R3, R4, R12, R16 ........ 56K ohms - 1/8 W – green, blue, orange
• R5, R6 .......................... 1K ohms - 1W – brown, black, red
• R7 ................................. 100 ohms - 1/8 W – brown, brown, black
• R9, R14 ........................ 4.7K ohms - 1/8 W – yellow, violet, red
• R10, R18 ...................... 4.7K ohms - 1W – yellow, violet, red
• R11, R15 ...................... 0.22 ohms - 5W – red, red, silver, gold , black
• R13, R17 ...................... 560 ohms - 1/8 W – green, blue, brown
• R19, R20, R21, R22 ..... 4.7 ohms - 18W – yellow, violet, gold
• R10 ............................... 4.7K ohms - 1W – yellow, violet, red

• C1, C2 .............................. 470pF – Polyester or Ceramic Capacitor
• C3, C4 .............................. 2.2uF – Electrolytic Capacitor
• C5, C6, C7, C8, 9, C10 .... 10uF - 63V – Electrolytic Capacitor
• C11, C12 .......................... 47 uF - 63V – Electrolytic Capacitor
• C13, C14 ......................... 100 nF – Polyester or Ceramic Capacitor

• L1, L2 .............................. 3uH inductor

• J1, J2 ................................ Kre Block Terminal Terminal 3-Way Triple Connector
• J1, J2 ................................ Kre Block Terminal Terminal 2-Way Double Connector
• Others .............................. Printed Circuit Board, tin, wire, etc.

Specified Transformer Power Supply

Fig. 4 Schematic Power Supply, click to download free the Gerber files

We are offering to download the link with the printed circuit board printing files, they are; Gerber, PDF layout, PNG, all the files with a direct link to Mega.

Direct link to download

Fig. 1 - PCB Power Supply LM350

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The LM350 Integrated Circuit

• Internal Current Limiting
• Thermal shutdown
• Secure Area Compensation

• Static Voltage Regulator for digital circuits
• Stable Current Regulator
• Variable Current Regulator

This device also does an especially simple adjustable switching regulator, a programmable output regulator, or connecting a fixed resistor between the setting and the output, the LM350 can be used as a precision current regulator:

• Guaranteed 3.0 The output current
• Adjustable output between 1.2 V and 33 V
• Load Regulation Normally 0.1%
• Line Regulation Normally 0.005% / V
• Internal thermal overload protection
• Temperature Short-Circuit Internal Current Limiting Current
• Compensation of the safe area of the output transistor
• Floating Operation for High Voltage Applications
• Standard 3-way Transistor Package
• Eliminates Socks Many Back Fix

The Circuit

Fig. 2- Adjustable Power Supply Schematic LM350

So you want to do a more powerful adjustable power supply, for example with 6 Amps, we have this adjustable module post in the link below:

Single module adjustable bench power supply 6Amp 1.2 to 25V

Components List

• U1 ........... LM350T – Integrated circuit, voltage regulator
• D1 ........... KBL610 Silicon Rectifier Diode Bridge
• D2, D3 .... 1N4007- Silicon rectifier diodes
• C2 ........... 4700 uF – 50V – Electrolytic capacitor
• C3 ........... 100 uF – 50V – Electrolytic capacitor
• R1 ........... 220 ohms – ½ W – red, red, brown
• T1 ........... Transformer 25 V with a minimum current of 3A
• RP1 ......... 5 K ohms or 4,7 k ohms – Linear potentiometer
• P1, P2 ...... Kre Block Terminal Terminal 2-Way Double Connector
• Others .... Printed Circuit Board, tin, wire, etc.

We are offering to Download the link with the printed circuit board printing files, they are; Gerber, PDF layout, PNG, all the files with a direct link to Mega.

Direct link to download

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

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 - PCB 70W Power Amplifier TDA2050

HI-FI 32W Audio Amplifier – TDA2050 – Simple PS + PCB

In today's post we'll build a High Fidelity Stereo power Amplifier that provides 70W RMS - with two TDA2050 Integrated Circuits.

The TDA2050 Integrated Circuits

The TDA2050 is a monolithic integrated circuit in a Pentawatt® package, intended for use as a low frequency Class AB amplifier. Typically, it provides 35W RMS output power with 4 Ohm load, THD = 10%, VS = ± 18V, F = 1KHz, and up to 32W RMS with 8 Ohm load, THD = 10%, VS = ± 22V, F = 1KHz.

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The TDA2050 - provides the high current output and very low harmonic distortion, it incorporates a short circuit protection system, an arrangement to automatically limit the dissipated energy, in order to keep the working point of the output transistors within their safe area of ​​operation, that is, a conventional thermal shutdown system.

SHORT-CIRCUIT PROTECTION

The TDA2050 has an original circuit that limits the current of the internal output transistors, the maximum output current is a function of the voltage of the collector-emitter; hence the output transistors work within their safe operating area. 

This function can therefore be considered to be a peak power limitation, rather than a simple current limitation. It reduces the possibility of the device being damaged during an accidental short circuit at the output.

THERMAL SHUTDOWN

The presence of a thermal limiting circuit offers the following advantages:

• An overload at the outlet (even if it is permanent), or an ambient temperature above the limit can be easily supported, as the Tj cannot exceed 150 ° C.
• The heat sink may have a lower safety factor compared to that of a conventional circuit. There is no possibility of damage to the device due to the high junction temperature. If for some reason, the junction temperature increases up to 150 ° C, the thermal shutdown simply reduces the power dissipation in the current consumption.
• The maximum allowed energy dissipation depends on the size of the external heat sink (i.e. thermal resistance); this power is dissipated depending on the ambient temperature for different thermal resistance.

The proposed circuit is a stereo power amplifier, it has two input channels and two output channels, and its schematic diagram is shown in Figure 2 below, and as we can see, it is the same circuit as the 35W amplifier, but it is duplicated making it stereo. 

The circuit is quite simple and can be easily assembled even by people who do not have so much experience in assembling electronic circuits, however, it is necessary to have knowledge of electronics.

Fig. 2 - Schematic Amplifier TDA2050

Component List

• U1, U2 .................................................. TDA2050 Integrated Circuits
• R1, R2, R3, R5, R8, R10, R11, R12 .... 1/4w 22KΩ Resistor
• R4, R9 .................................................. 1/4w 680Ω Resistor
• R6, R7 .................................................. 1/4w 2.2Ω Resistor
• C1, C14 ................................................ 25V 2.2µF Electrolytic
• C2, C15 ................................................ 25V  100µF Electrolytic
• C3, C7, C8, C9 .................................... 35V  1o00µF Electrolytic
• C4, C12 ............................................... 25V 22uF Electrolytic
• C5, C11 ................................................ 100nF polyester
• C6, C10 ................................................ 0.47µF polyester
• RP1, RP2 ............................................. 47KΩ Potentiometer
• P1, P3 …......….........................…........ Screw Terminal Block: 3-Pin, 5 mm
• P2 …............…..............................…... Screw Terminal Block: 2-Pin, 5 mm
• Miscellaneous: printed circuit board, heat sink, box, tin, wires, etc.

Printed Circuit Board

The layout of the Printed Circuit Board is shown above in Figure 1, and we have all the necessary files for you to be able to print your PCI, with the GERBER files, PDF Layout, JPG, all with a direct link for you to download and assemble yours.

Downloadable files

Files: Gerber, Layout in PDF, PNG, for download. Direct link: Click Here

Fig. 1 - Layout of the Printed Circuit board

56W RMS Hi-FI Amplifier using LM3875 Integrated Circuit + PCB

For Portuguese version, click here! 

High-performance Hi-FI Audio Amplifier, capable of producing excellent audio quality, using the LM3875 integrated circuit.

The LM3875 is a high-performance power audio amplifier capable of delivering 56W of continuous power at 8Ω load with 0.1% THD + N from 20Hz to 20KHz.

The LM3875 features an instantaneous temperature protection circuit with auto peak (° Ke) (SPiKe), which puts it in a class above discrete and hybrid amplifiers, inherently providing a safe operating area (SOA) dynamically protected by the circuits.

SPiKe protection, this means that the entire circuit is completely protected at the output against over-voltage, under-voltage, overloads caused by shorted outputs, thermal leaks, and instantaneous temperature spikes.

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The LM3875 maintains an excellent signal-to-noise transient rate above 95dB (min), with a typical low noise level of 2.0μV. It displays extremely low THD + N values ​​of 0.06% at the rated output into the rated and provides excellent linearity with a typical IMD (SMPTE) rating of 0.004%.

Features of LM3875

• 56W continuous average output power at 8Ω
• 100W instantaneous peak output capacity
• Signal-to-noise ratio> 95dB (min)
• Short-circuit protection to the ground or, to supplies via internal current limiting circuit
• Output overvoltage protection against inductive load transients
• Provides protection against under-voltage, not allowing internal polarization when | V + | + | V− | ≤ 12V, thus eliminating the activation transients are deactivated
• 11 Lead PFM Package
• Wide supply voltage range: | V + | + | V− | = 20V to 84V
• Total harmonic distortion (THD) less than 0.03% in the frequency range of 20Hz to 20kHz

Power Supply Circuit

The power supply provided by a transformer AC,  which can be elaborated through a 28-0-28Vac,  with 5 Ampers current, which after going through the rectification, will be delivered in the supply range around +/- 40Vdc.

As we saw in the characteristics of the LM3875 above, it has a wide range of supply voltage, which we can use a lower voltage or higher voltage source, we can do with what we have on our bench.

In Figure 2 below, we have the schematic diagram of the 56W Hi-End Amplifier with the LM3875 CI.

Fig. 2 - Schematic diagram of 56W RMS Hi-End Amplifier with LM3875 IC

Component List

Printed Circuit Board

The layout of the Printed Circuit Board is shown in Figure 1, and we have all the necessary files for you to be able to print your PCI, with the GERBER files, PDF Layout, PNG, all with a direct link for you to download and assemble yours.

Downloadable files

Files: Gerber, Layout in PDF, PNG, for download. Direct link: Click Here

I hope you enjoyed it!!!