Monday, September 14, 2020


12V Subwoofer amplifier

Hello friends, in this post I will make an amplifier kit, using the TDA8954TH class-d amplifier chip that I have previously made, but in this post, I will make a complete amplifier with a subwoofer preamp and also a DC to DC converter circuit, where is the power This amplifier can be supplied using a 12VDC voltage or using a battery, or a 12V battery. The purpose of which is applied to car audio such as monoblock car amplifiers, but this amplifier is also multifunctional, can be used for home audio, the output can be flat, or stereo.

The following is the circuit of the TDA8954 power amplifier along with the converter and subwoofer preamp. 

Downloadable schematic .PDF 

The DC to DC converter circuit, the PWM IC uses TL494, the mosfet uses 6 N-channel Mosfets. For the transformer can use ferrite EE or Toroid. with the number of turns as shown. The primary wire size must be larger than the secondary by a 3: 1 ratio.

12VDC CT for opamp circuit or subwoofer preamp. and this 5V to supply to pin MODE TDA8954.

Then I took the protection from the diagnostic output of TDA8954. so when the amplifier has a problem, the diagnostic pin will send a command to the protection section to turn off the PWM converter for 100mS and will activate again when the amplifier is normal, and this is not in lock mode, except for OVER TEMPERATURE. in case of overheating, the converter will shut off completely until the kit is switched on again and is cool. Over-temperature around 120 degrees Celsius.

I added a series of subwoofer filter circuits, it could also be flat, by changing this jumper pin. or it can also be used for stereo, but only for flat if there is a stereo, no a subwoofer. Subwoofer filter especially for BTL. There is also a subwoofer frequency setting, subsonic filter, bass boost, and gain.

The TDA8954TH circuit is still the same as before, but what is different is the LPF part, I use a single core, diameter 3.3cm. The performance of this amplifier is around 420W according to the datasheet, for a load of 8 Ohms in BTL mode, and 4 ohms in stereo mode. For BTL it is not recommended for speakers below 8 Ohm because later it will be easy to Over Current, it can cause the sound to be broken because when the overcurrent amplifier is restarted, it will dive for 100mS and it is sustainable. So adjust the load to a maximum of 8 ohms for BTL.

And I have designed the following PCB, with a double layer path, as usual, this PCB can be downloaded at the link at the end of the Gerber format post, along with the component list files, schematics, and CPL files.


Step-up transformer, I use a ferrite core ee42, with the number of primary turns 5 + 5 turns. secondary 13 + 13 convolution. the secondary voltage is around 32VDC CT. This is for the 5VDC aux, the number of turns 3, and this for the 12VDC CT aux opamp the number of turns 6 + 6 turns.

For the LPF inductor, the amplifier can use an MS13060 core or you can also use a 77071A7 series core with the same outer diameter of about 3.3cm. because this amplifier is BTL or STEREO so it requires two inductors, but I only use a single core with 2 inductor turns, the way it is twisted is made in the same direction, the number of turns using 1mm wire produces an inductance value of around 22uH x 2.

Download Schematic, BoM, PCB Layout Gerber, CPL Files:


Extract file before using

Thursday, August 27, 2020



Hello friends, on this occasion I will share a complete schematic and PCB layout with BOM files and CPL files for the DC to DC 12VDC to 40-90VDC Converter kit which can adjust to the twisted step-up transformer. Here is a DC to DC Converter scheme using IC TL494 with 8 mosfet IRB4110.

For the transformer, you can use the ferrite EE55 transformer which is rolled using an email hook.
For the primer, use a wire with a diameter of 0.8mm, as much as 7 copies, wound 3 + 3 times.
And the secondary uses 3-fold 0.8mm wire wrapped around 22 times for the CT 90VDC voltage.

To make it easier, provides its PCB Layout which you can download at the end of the post.

DC TO DC COnverter


Monday, July 20, 2020

12V Power Amplifier Subwoofer using TDA7388 IC

Elcircuit will share the scheme along with the PCB layout for the power amplifier subwoofer that operates on a single 12V DC voltage or can use a 12V DC battery. The circuit and PCB layout were designed by Barlex Respectaizer. The following schematic and PCB layout, you can also download it at the end of the post.
12V Subwoofer Power Amplifier
12V Power Subwoofer Amplifier
The circuit use TDA7388 as the power amplifier and it upgradeable to TDA7560. For the Active Lowpass filter, I use a NE5532 IC. I design this project suitable for car subwoofer, motorbikes audio modification event, home, and everything that comes with 12V battery or transformer. The circuit is made as simple as possible with standard through-hole Components that easily found in the store. There are 2 potentiometer settings: -Frequency cross over -Subwoofer Volume It needs single supply 12Volt/10-15A If use with transformer, you may need external bridge diode to make DC voltage.

12Volt Subwoofer Amplifier

Saturday, July 04, 2020

Discrete Power Amplifier Class-D UcD Superlite - Single Layer PCB

I have often posted this Discrete Class-D UcD Superlite because this power amplifier has quite an impressive sound quality, clear sound, and has a wide frequency response, mid and high sounds can be clear. And has a bass sound character that tends to be soft and deep. So this high-efficiency amplifier can be used for high-quality audio classes. Can be used for professionals or for home audio.
The UcD Superlite amplifier circuit was designed by Mr.Kartino Surodipo, a class-D Amplifier master who often designs class-d power amplifiers that are distributed free of charge, on Facebook Groups and on forums.
And in this post elcircuit shares this PCB Layout Power AMplifier D-class UcD Superlite with a Single-layer PCB design. This PCB layout was designed by Mr. Ruzzel Rotao from the Philippines. The following PCB Layout Pictures, you can download this layout with PDF format below, and the amplifier also works 100% please try, good luck
Class-D UcD Superlite

Saturday, June 27, 2020

2.1 Audio Amplifier using LM1876 + 2SC2922 2SA1216 OCL Subwoofer

2.1 Audio Circuit using LM1876 + 2sc2922 2sa1216 OCL Subwoofer is a power amplifier with a 2.1 channel system (3 Channel Amplifier) 2 Channel Stereo +1 Channel Subwoofer.
 2.1 Audio Amplifier using LM1876 + 2sc2922 2sa1216 OCL Subwoofer

Friday, June 26, 2020

TDA2030 Stereo Amplifier + Tone Control

TDA2030 Power Amplifier is a power amplifier based on chip or integrated circuit (IC), where the IC also has the similarity of TDA2050 and LM1875, both gainclone amplifier categories. This power amplifier is in great demand by various groups, because the price is relatively cheap, and many components that are used in the market, and amplifier assembly is not difficult. In this post, there is a series of TDA2030 Stereo Power Amplifier and also equipped with Tone Control, the use of stereo amplifiers can be used for home audio, with the low-cost category. The following circuit diagram Stereo TDA2030 + Tone Control:
Stereo TDA2030 Amplifier + Tone Control

5.1 Surround Sound Decoder

The circuit of 5.1 surround sound decoder (audio  5.1/ Dolby Prologic), this circuit serves to convert analog signals stereo or 2-channel, into 5.1 ch. By using the non-digital decoder method, so this circuit processes analog signals with the IC Op-Amp 4558, so that signals that were stereo can change to 5.1 or 6 channels, namely Left, Right, Center, Rear Left, Rear Right, and Subwoofer. This circuit works with a 12V symmetrical voltage (12VDC CT). The following PCB Layout (Electro India) and its component list,

5.1 Surround Sound Decoder single layer PCB:
5.1 Surround Sound Decoder