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Old 23rd July 2012, 08:59 AM   #1
gohar is offline gohar  Pakistan
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Post Need to Built Amplifier, Need Help

Hi all,
i'm new to all and Audio also.
I have a sort of speakers as,
2x 5watts, 4ohm
2x 10watts, 4ohm speakers
1x 30watts, 4ohm subwoofer.

I wanted to make a 2.1 channel sound system and need your help.
kindly suggest me Designs, PCBs , etc
regards
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Old 24th July 2012, 10:28 AM   #2
Mooly is offline Mooly  United Kingdom
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Hi gohar and welcome,

I would suggest a chip amp or "gainclone" based on devices such as the LM3886.

Have a browse through the chipamp forum,
Chip Amps - diyAudio

Kits for these type of amplifier should be easily available and ensure a reasonable chance of success.
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Old 24th July 2012, 04:02 PM   #3
gohar is offline gohar  Pakistan
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Thanks for your precious reply.
Can you direct me some DIY amps that i can make,
And a question is that is only one amp is required for speakers and subwoofer? or two separate amps are needed?
Can anyone explain me in some detail?
regards
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Old 24th July 2012, 05:23 PM   #4
Mooly is offline Mooly  United Kingdom
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Usually a subwoofer has its own amp that includes a filter to ensure only the low frequencies are amplified and fed to the speaker. So that's one amp for the sub and two more for left and right. Three in total.

Have you looked at the chipamps forum yet ?

If you ask there about what kits are currently recommended (that folk have built successfully) then I'm sure you'll get some good advice.

Depending on your skills you could buy just the PCB's and obtain all the parts yourself... in some ways the best option because you can ensure you only buy quality parts.

Just search for "LM3886 PCB" on ebay as an example.
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Old 25th July 2012, 11:44 AM   #5
gohar is offline gohar  Pakistan
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What happens if i connect 30watts 4ohm speakers with 68watts amp??
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Old 25th July 2012, 05:40 PM   #6
Mooly is offline Mooly  United Kingdom
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Quote:
Originally Posted by gohar View Post
What happens if i connect 30watts 4ohm speakers with 68watts amp??
It depends how loud you turn it up

It also depends on how the speakers and amplifiers are rated. A "true" rating would be the speaker manufactuer saying it could handle 30 watts RMS but often ratings can be a nominal figure sometimes based on music power or peak music power. If so they become meaningless.

30 watts at 4 ohms requires 11 volts RMS.

A 68 watt amplifier (assuming RMS values and nominal 8 ohm load) can put out over 23 volts RMS so the danger is obvious. Reduce the load to 4 ohms and if the amplifier can cope then the power dissipated in the speaker goes up to over 130 watts.

In practice... more damage is done by using low power amplifiers and driving them into clipping. That often results in burned out tweeters.

That said I would be quite happy with a 68 watt amp and 30 watt speakers when used carefully.
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Old 26th July 2012, 02:37 AM   #7
gohar is offline gohar  Pakistan
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I wanna drive 15watts 4 ohm per channel, then what power rating amplifier should i use?
i wanted to make a sound system comprising of 15 watts left and 15 watts right channel with 30watts subwoofer. is LM3886 amp would be good for it? I wanted to build amp myself,

And tell something about TDA2030. Is it good for my 15watts 4ohm load per channel?

Last edited by gohar; 26th July 2012 at 02:50 AM.
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Old 26th July 2012, 06:50 AM   #8
Mooly is offline Mooly  United Kingdom
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The TDA2030 is a very old chip and not very good in use. I certainly wouldn't recommend that one.

The LM3886 is perfect for what you want. Use with a 20-0-20 vac transformer and PSU.

Don't worry so much about speaker power and amplifier power. It's not a problem. Just make sure the amplifier is capable of fully driving your speaker without clipping (the LM3886 will be perfect)
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Old 26th July 2012, 08:16 AM   #9
gohar is offline gohar  Pakistan
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OK then LM3886 is done. I wanted to do every step of building amp myself. for this purpose please recommend me some details, circuits etc.
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Old 26th July 2012, 08:37 AM   #10
gohar is offline gohar  Pakistan
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Ok then LM3886 is good. Now Give me some info, designs, circuits etc. I've planned to do every step myself.
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