Thursday, December 31, 2020




 Audio/Video Amplifiers & Receivers

Pro-audio Amplifiers

Automobile Power Amplifiers

Subwoofer Amplifiers


Class-T architecture

Proprietary Digital Power Processing technology

“Audiophile” Sound Quality

0.02% THD+N @ 50W, 8Ω ¾ 0.03% IHF-IM @ 30W, 8Ω ¾ High Efficiency ¾ 95% @ 150W @ 8Ω ¾ 90% @ 275W @ 4Ω ¾ Supports wide range of output power levels ¾ Up to 300W/channel (4Ω), single-ended outputs ¾ Up to 1000W (4Ω), bridged outputs ¾ Output over-current protection ¾ Over- and under-voltage protection ¾ Thermally Enhanced 48-pin DIP (dual-inline package)

Schematic Power Amplifier Class-T TA3020:

PCB Layout Design Stereo Class T TA3020:
Class-T TA3020

Download Schematic & PCB Layout with Gerber file format:

The PCB Layout and Schematic include DC Protection and V5 regulatedpower supply with LM2596.

Power Amplifier BE500 TEF PCB Layout

 Power Amplifier BE500 TEF PCB Layout max power supply 90VDC CT.

Power Amplifier BE500 TEF PCB Layout

Power Amplifier BE500 TEF PCB Layout Bottom Layer

Power Amplifier BE500 TEF PCB Layout Top Silk

Fix PCB Layout  Dimension:9,5x9.2cm

Download high resolution image: BE500 TEF .rar

Saturday, December 26, 2020

Power Amplifier Micron 741 - Schematic

Power Amplifier Micron 741, Simple Class-AB Power Amplifier, Supply 25VDC-50VDC CT. The Schematic and Power Amplifier Micron 741.
Power Amplifier Micron 741 - Schematic

Power Amplifier Micron 741 - Schematic

Power Amplifier Micron 741 - Scheamatic

Main characteristics: 
Input resistance: 22 kOhm
Input sensitivity: 0.7V 
Frequency response: 10-24000Hz 
Output power: 80W at a load of 8 ohms 100W at a load of 4 ohms 150W with a load of 2 ohms when powered (+/- 50V)

Friday, December 11, 2020

Power Amplifier Class-D D1K Clocked

Hello guys, in this post I will share the PCB layout power amplifier Class-D D1K Clocked. Power Amplifier uses an external clock, using the CD4049 IC as a triangle signal generator. The following is a schematic image, this scheme was designed by Mr. Kartino Surodipo Master Class-D from Indonesia.

Power Amplifier Class-D D1K Clocked
You can download the schematic above as a PDF file, so you can see a clearer schematic image. Class-D D1K Clocked using External Clock from IC CD4049 as its triangle wave generator. IC CD4049 is very vital, use a good quality IC. so that the shape of a good triangle signal is flawless, if you use a bad IC CD4049, this will result in bad sound output too. Usually, there is a large amount of noise, and even worse, the amplifier cannot run, because the triangle wave does not come out of the CD4049 IC. to balance the PWM gate you can set the trimpot slope balance. and trimpot freq to set the PWM frequency.

And need to pay attention again to the 5V supply, the 5V supply must be balanced too, otherwise, we will have trouble setting the slope balance.

To make it easier to assemble the d1k clocked class-d power amplifier, I will share the PCB Layout file in the form of a Gerber file as well for the part list which you can download at the end of the post.
PCB layout amplifier Class-D

Power Supply 90VDC Symmetrical. 


Tuesday, November 17, 2020

PCB Manufacturing Process - How To Provide The Best Products

 Are you prefer good quality PCB? Then this might be your long awaited article. We are going to guide you through the necessary steps you need to make the difference to make you achieve the best.

1、PCB Manufacturing Process

In a broad sense, As we all know, All PCBs have a distinct use for an electric product,  there is no standard,  therefore the procedures involved in the production of the PCBs varies and more complex.

In the manufacturing of the PCBs, there are several steps should be followed to achieve the desired result. 

well PCB

Step 1: The first thing that comes to mind is deciding what kind of electronic circuit to design on the printed circuit board. It is an essential aspect of PCB manufacturing. Make your preferred designs for your board with software like EAGLE.
Step 2: Print out your design on a suitable type of paper using a printer - laser printer. Ensure that it is possible to fit in all the components on the print, with the size of the layout equivalent to that of the PCB.Cutting and laminating according to the size of the finished board or the size of the panel; And then drying, it is to remove the moisture in the board and prevent it from warping during processing. Generally, it is dried at 150℃ for 3-4 hours.
Step 3: Inner Layer Imaging , Etching and Inner Layer AOI-Photo-imaging is the main process of open and short circuit. Therefore, the environmental sanitation requirements are very high. Personnel entering must be cleaned by air shower door. All operators need to wear anti-static clothing.Through the etching line, the copper skin covered by the dry film is protected, while the copper skin not protected by the dry film is etched away.

For AOI, this is an automatic optical inspection to check whether the core plate after etching has open or short circuit, and the etching is clean or not.The line pattern that needs to be retained at this time will be displayed by etching.
Step 4: the next step is drilling the laminated plate. At this time, there is no metal in the hole, that is, the layer cannot be connected to the layer. In other instances, automated drilling machines are utilized for big sized projects. The surface of the material is coated with gold, nickel, and so on.
Step 5: Next is Outer Layer Imaging and etching- By etching the line, the exposed copper will be etched away, while the copper protected by tin will remain.

Step 6: Surface Finishing Process-Soldermask , silkscreen and some special surface finishing process will be done. 

So far, the board production has been basically completed, but another important thing is to conduct electrical testing to ensure functionality. The main tests that are performed are the circuit continuity and isolation tests. It is then tested and assembled.

PCB technology continues to evolve with the times. There has been a significant improvement in aspects relating to miniaturizing, sophisticating and high-end. The PCB now has successfully been able to meet a wide variety of needs or requirements. 

The manufacturing of PCB depends on some techniques that go along with plating, etching, use of the machine, and so on. When we make mention of these different techniques, you would understand that each of them has its unique functions, and one important thing to note in the manufacturing of PCB is the accuracy of the equipment.

3、Best Manufacturing Process PCB Fabrication Specification
Printed circuit boards are important for every product related to electronics, just as the heart is important to the body. 

The PCBs are concerned with parts or components that give internal instructions to your products, and they are designed in many different shapes and size.
The fabrication specification can be said to be the design requirement which is not concerned with the behaviours or function of a product, but rather, determines the manufacture’s ability, cost, and so on. 

3.1: What to note about the fabrication specification
Size: It refers to the dimensions of the circuit board. At this stage, you need to note that the cost of the printed circuit board varies with the size of the board size and shape. If we should compare an irregularly shaped board to a small rectangular type of the exact board, the irregularly shaped PCB will be more costly.

Complexity: The number of layers and circuit design measures the complexity of the PCB.
Type of material: Many PCB designers prefer the FR-4 as the first option, but considering the thickness of the material, must give the greatest attention. Other types include aluminum boards, Rogers, etc., prices are also different.
Thickness: To some extent, the thickness of the board depends on the number of layers or requirements the designer has designed, sometimes affecting the final thickness.

The thickness of the board is an elementary mechanical specification of the board, and sometimes, 1.6mm seems to be the standard. The designer is responsible for selecting the dimensions that will suit the preferred thickness.

Plating: the plating refers to the situation in which copper surfaces which are not covered are covered with another material of metal to increase the level of solderability when assembly operation completed. Hot Air Solder Leveling is a common type of plating, and we also have other types of plating which include ENIG (Electroless nickel immersion gold is more costly plating but of course gives a better result).
3.2: Checking For Design Rule Violations
Immediately you know your way around fabrication specifications, it is necessary to go along with the specification all through the development process.

If we are responsible for your PCB, then this only means that you prefer a high-quality type, as this is what we offer. We have taken you through the information concerned with the PCB manufacturing processes, and the least we can now do is give you the very satisfied service and your desired products.
Why don't you contact us today and secure your interest in high-quality products?  Also, you can request for a quotation, and in case you have troubling questions or suggestions, please feel free to pass them across.

Friday, November 06, 2020

Converter DC to DC 12VDC to 65-90VDC CT for Audio Amplifier OCP Ver

Converter DC to DC 12VDC to 65-90VDC CT for Audio Amplifier 

Converter DC to DC 12VDC to 65-90VDC CT for Audio Amplifier

This version includes OCP (Over Current Protection) you can download the Gerber for converter board and PWM Board. Gerber, Bill of Materials, CPL File ( Pick and Place File) for order SMT Assembly.

Schematic Board

Converter DC to DC 12VDC to 65-90VDC CT for Audio Amplifier


PCB layout Gerber Board Converter

PCB Layout Gerber PWM Board

BoM PWM Board


Monday, October 26, 2020

Build Stereo Power Amplifier TDA7294 2x90W

Schematic diagram of a Power Amplifier TDA7294

Build Stereo Power Amplifier TDA7294 2x90W

Symmetrical Power Supply

Build Stereo Power Amplifier TDA7294 2x90W

TDA7294 Features:  A very high voltage operating range (± 40V), DMOS power stage, High power output (up to 90W), Mute / STAND-BY function, Low distortion, Low noise, Short circuit protection, Thermal shutdown

PCB Layout Design

PCB Layout TDA7294
Connection Diagram
Diagram TDA7294

Part's list

2 Integrated circuit TDA7294

1 Diode Bridge 10 amps

1 Diode 1N4148

2 short fuse holder for printing and two 5 Amp fuses

2 small 3-pin connectors (GP)

2 large 6-pin connectors (Molex)

1 Transformer 29 x 29 volts AC at 5 or 6 amps.

1 aluminum heatsink

2 mica insulators, with their respective wall passes

2 screws with nut and washer

2 Capacitors 4700 uF at 50V or 6800 at 50V

2 Capacitors 0.1 uF (104) to 100V Polyester

2 Capacitors 0.47 uF (474) at 100V Polyester

2 Capacitors 0.1 uF (104) to 250V Polyester

5 Capacitors from 22 uF to 50V

1 Capacitors from 10 uF to 50V

2 Capacitors from 10 pF to 50V Ceramic

2 Capacitors 390 pF at 50V Ceramic

4 Resistors from 56K to 1 / 4W (green, blue, orange)

2 1K to 1 / 4W resistors (brown, black, red)

6 Resistors from 5.1K to 1 / 4W (green, brown, red)

3 Resistors from 8.2K to 1 / 4W (gray, red, red)

2 2.7 Ohm resistors at 1W (red, purple, gold)

2 Resistors of 8.2 Ohms at 1W (gray, red, gold)

The coil is made with copper wire, 18 gauge according to the AWG table, (1,024 mm.) And a 3/8 bit, on which we make 11 turns evenly, we cut the excess wire and straighten bobbin legs so that there are 10 turns.


PCB Layout TDA7294 Stereo Amplifier PDF