Designing 4 channel ampli for Mid and Hi band using LM1875 or any other about 25 watt - diyAudio
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Old 21st February 2007, 01:09 PM   #1
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Unhappy Designing 4 channel ampli for Mid and Hi band using LM1875 or any other about 25 watt

Hi


This is Makarand from INDIA , the new commer in Audio world.


I am going to make 3 Way Active Crossover Network for my home use. For the same I want to assemble 2 + 4 Channel ampli of 50 Watt RMS x 2 and 25 watt RMS x 4 channel . Actually I read detaild from www.sound.au.com , but I get confused for making such ampli , mainly about the requird Power Supply , Amplifier PCB etc. Can any one guide me or help me for completing this project.



Thanks.
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I am not a technical person in this audio field but its my hobby . I want to make HiFi audio system for my home use. Please any one can help me to make it by providing guidelines.
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Old 22nd February 2007, 07:21 AM   #2
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Ok i guess i can help you.
We must start with to find a good amplifier circuit.
Do you perefer LM1875?
I guess Two LM1876 for each speaker box will be very suitable. Because you will use one channel for tweeter = 25W, one channel for mid = 25W and one channel for bass 50W on each box does it ok?
Then actually you need two LM1876. It includes stereo 25W amp in each chip. So you can use one for mid and tweeter, and one in bridge mode for bass.
This will be your mid and tweeter amp;
Click the image to open in full size.
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Old 22nd February 2007, 07:24 AM   #3
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And this will be your bass amp that can give 50W RMS to a 8ohm load;
Click the image to open in full size.
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Old 22nd February 2007, 07:33 AM   #4
Dxvideo is offline Dxvideo  Turkey
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This amp IC also has an internal mute and stby switch. That means you can control it remotely very very easy.
You will feed this two babies with just 2 x 24v symmetrical PSU. Means you'll buy a 2x18v 200W trafos and a 5A bridge rectifier and 10,000F on each rail. Its that much easy.
And if we come to filter;
http://users.otenet.gr/~athsam/elect..._crossover.htm
This is a link for 3 ways active crossover. But i guess itss some complex. It will need +/15v for supply. Then you can use your 2x24v and add 7815 and 7915 on rails.
Thats all. If you need more information pls feel free.
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Old 23rd February 2007, 11:11 AM   #5
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Talking Setting Active Crossover Frequency

Hi ,

I am Makarand from INDIA.


Can any one help me about HOW TO SET CROSSOVER FREQUENCY for Active Crossover Network. I want to make 2 way active system for my home use. I already buy 8" Full Range woofer cone PA systems speaker for Mid and Bass section and I use 4" car speaker + 3" Tweeter for Hi pass section , this is becauseoff to full frequency responce. I can get Hi Quality speaker sets that is the reason why I select this.


Waiting reply , thanks.


Makarand
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I am not a technical person in this audio field but its my hobby . I want to make HiFi audio system for my home use. Please any one can help me to make it by providing guidelines.
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Old 6th June 2007, 02:08 PM   #6
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Unhappy Design TriAmp for 3way Active Crossover



Hi

I am Makarand.

I am going to design 6way ampli for my 3 Way Active Crossover Network from www.sound.au.com , for the same I want to make the ampli.

Can any one help me to make 4 channel ampli using LM1875 and 2 channel using LM3886. If possible with PCB and Power Supply.


Waiting reply


Makarand
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I am not a technical person in this audio field but its my hobby . I want to make HiFi audio system for my home use. Please any one can help me to make it by providing guidelines.
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