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Thursday, August 27, 2015

Lm3886 Gainclone

Within two years I have made ​​a few DIY amplifier many sources of diyaudio. I ever made a chip amp, class ab and class d amp. Among dxblame st (good bass), sr200 (low noise), B500 and etc.. Amp chip is the first amp I make. And it was the amp that still can not be defeated by the other in terms of vocal amp. So I chose lm3886 chip for my audio system.

  • My complete gainclone in wood case. Using black carpet casing.


  • Using 30vac toroidal transformer. Using mdf to build case.


  • Using apex's regulator to regulate 35vdc from from 42vdc. Detail about this regulator here.


  • Using apex's stereo tone control with +/-10dB bass and treble adjust. This tone control low noise and good design. More detail about this pre amp here. Apex pcb file stereo tone control.


  • For the amplifier, i use below circuit to implement this project. Good explanation here.















Sunday, August 28, 2011

Bridge Circuit

This post about how to build circuit to bridge 2 channel amplifier. Below the circuit for bridge system.









More detail read more here.
One more here.

Saturday, August 27, 2011

Subwoofer Amplifier

I tried several types of amplifiers to be used for home theater systems. Among ab class and class d. The result I am satisfied with the sound of the chip STK4050. Power supply +-60V x2. And use the subwoofer kenwood 10 ". Under the clear spec of this amplifier.

  • My subwoofer amplifier with four low pass tone control.
  • Using toroidal transformer 50vac x2. I turn back the coil to increase the voltage.
  • Using apex regulator to regulate voltage from 75vdc to 6ovdc. This regulator support at 10 ampere and using 2 pair of power output.
  • Using 12oouf Elna capacitor for regulator part.
  • Using diy subwoofer tone control.
  • Using modified stk diagram from ampslab
  • Digital voltmeter to view voltage drop.

  • Subwoofer crossover on output speaker.

Thursday, August 26, 2010

Test Smps with Stereo LM3886T

video

Ferric Core

Different color mean different frequency


Using in car amplifier
Work with some coil to step up voltage

Tda Amplifier