Pics of my new 4 way active filter and amplifier using NE5532 LM3886 and LM1876

[aniruddha]

https://plus.google.com/photos/109335111727003972858/albums/5694523380352818305

 

[GloBug]

Looks good Anir, I bet it was a fun project. I would like to see a schematic when you get the time.

 

[aniruddha]

Attached are the schematics










for LM3886 and LM1876 amplifier : I added DC blocking capacitor (1uf and 47k) and a high pass filter with 470pf and 680Ohm to amplifier boards externally by removing one of the resistor and soldering directly on backside of PCB. I also added 220pf capacitor between the input pins,

I don't have schematic of LM1876, but i used the same as given in datasheet.I directly created board for this amplifier as i was not able to find proper eagle library for lm1876, one which i used does not align with the pins of lm1876, I somehow managed to stretch the pins of IC and mounted it on the PCB.

I have not used any of the 3 pin connectors for connecting potentiometer shown in active filter schematic as it was resulting in lots of noise, I just shorted the pins and used final output pins of filter board to connect potentiometer.
Values of resistor and capacitors are calculated using esp-lr13.exe program available on this link (Linkwitz-Riley Electronic Crossover)

Crossover frequencies chosen are below
Sub : 112.5 Hz (lowpass)
Mid Woofer : 75~900 Hz (Bandpass)
Mid Range : 750 ~ 3500 Hz (Bandpass)
Tweeter : 3500 Hz (HighPass)

1n5408 board is used for power supply of midrange and tweeter (2 x LM1876)
2 x MUR860 board are used for Subwoofer and mid woofer amplifier (4 x LM3886)
1n4008 for active filter power supply.

 

[GloBug]

Thanks! I was wondering if you used the Linkwitz-Riley.
Very nice project indeed. I hope you enjoy it.

 

[aniruddha]

Thanks GloBug, Yes this project was much more fun than expected 🙂

 

[kuldeepsingh]

really cool... must be enjoying listening them...
where u got the PCBs made?
also chk out my 5.1 home theater system 🙂

 

[aniruddha]

Hi Kuldeep,

I got the PCB made 3 years ago from AV process , pune

Av Process, Sadashiv Peth, Pune, India on Askme

I started this project 3-4 years ago, but left it in the middle because i was tired finding out the components in local market. Fortunately i got my enthusiasm back 2 months ago, did lots of travelling in pune local electronics market and lamington road (mumbai) and finally I finished this project 🙂

I almost explored most of online resources(pics and schematics) for DIY chipamps, I have seen your project webpage earlier, it looks awesome!


Thanks,
Aniruddha

 

[sulabh]

Hii Aniruddha.....nice to see people from pune active on DIYaudio.....
i am new on diyaudio.....
currently looking for a good amp for subwoofer.....to add to my existing stereo speakers....will take ur help......

 

[sulabh]

saw ur work on google+ ......awesome work man.......
Here is my existing stereo system.....to which i need to add the SUB.....
http://www.facebook.com/media/set/?set=a.1697852484611.2095179.1186835873&type=3

 

[aniruddha]

Thanks Sulabh

 

[diarav]

Hi Aniruddha,
Great work! I see from your pictures a lot of hard work has gone into this! Keep it up and Enjoy!