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.
  
  

Adjustable Power Supply 1.25v to 57V, 6 Amps using TIP36C + LM317HV

The LM317HV is an adjustable 3-terminal positive voltage regulator capable of supplying 1.5 A or more currents over a 1.25V to 57V output voltage range. It requires only two external resistors to set the output voltage. The LM317HV is packaged in standard transistor packages that are easily mounted and handled.

However, the LM317HV supports high voltage, but the current is still low, only 1.5A, our circuit, we are increasing a drive circuit to increase the current we need to 6 Amps, with three TIP36C transistors, which provides an adjustable output voltage between 1.25v to 57 volts, with a current of 6 Amps, which is enough for a bench power supply.

• Switched Power Supply SMPS 13.8V 10A using IR2153 IC and IRF840, with PCB
• Adjustable Power Supply 1.5V to 28V, 7.5A With IC LT1083 + PCB
• Adjustable Switching Power Supply 5.1 to 40V, 2.5 Amp using L4960 + PCB
• Adjustable Power Supply 1.2V to 37V, 6A, Short Circuit Protection with LM317 and TIP36 + PCB
• Symmetrical Adjustable Power Supply 1.25V to 47V 10 Amps with Short Circuit Protection + PCB
• Adjustable Power Supply 1.2 to 37V High Current 20A with LM317 and TIP35C + PCB
• Adjustable Power Supply 1.25v to 33V, 3 Amps with LM350 + PCB
• Stabilized Power Supply 13.8V High Current 10 Amps with PCB

The Circuit Diagram

The schematic electrical diagram, which follows in Figure 2 below, it's very simple, first one, we have the voltage input that comes through connector J1, which enters through resistor R1, that as long as there is no current greater than the one calculated, there is no drop of voltage in R1, more if the current increases, there will be a voltage drop of approximately 0.6V, which will cause the transistors to saturate, causing the current to pass through the power transistors.

The capacitor C1 has the objective of attenuating the interference of the ripples and their stability. Capacitor C2 has the function of eliminating high interference, and capacitor C3 has the function of constancy to decrease the ripple and stability of the power supply.

P1, is a 5K analog potentiometer, if you don’t have 5K you can put 4.7K, which is more commercial, the diodes D1 and D2 are to avoid reverse voltage over the Integrated Circuit U1, and in the transistors, resistors R3, R4 and R5, are impact resistors, which attenuate the difference between the transistors and prevent one from working more than the other.

Fig. 2- Adjustable Power Supply Schematic LM317HV + TIP36

Components list

• U1…………….... LM317HV – Integrated circuit, voltage regulator
• Q1,Q2,Q3 ...…... TIP46C Power Transistor
• D1, D2 ………....1N4007- Silicon rectifier diodes
• C1 ……………... 470 uF – 65V – Electrolytic capacitor
• C2 ……………... 100 nF  Ceramic capacitor
• C3 ……………... 2200 uF – 65V – Electrolytic capacitor
• R1 ……………... 10 ohms – 1W – brown, black, black, gold
• R2 ……………... 2K ohms – 1/4 W – red, black, orange, gold
• R3, R4, R5 .….... 0.22 ohms – 5W – red, red, silver, gold
• R6 ……………... 220 ohms – 1/4W – red, red, brown, gold
• P1 ……………... 5 K ohms or 4,7 k ohms – Linear potentiometer
• J1, J2 …….……. Kre Block Terminal Terminal 2-Way Double Connector
• Others ............… Printed Circuit Board, tin, wire, etc.

PCB - Printed Circuit Board

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.

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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.

You might also be interested in:

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