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Links/advices to build a (monitor)speaker amp?

post #1 of 6
1/23/12 at 1:33pm
Thread Starter 

I want to build one amp capable of driving stereo speakers, if someone knows where to find DIY projects please contribute.

 

I belive some of those listed here at head fi are maybe able to do such(i don't know), so those also apply.

 

possibility for 2.1? (dedicated lows speaker)

 

from 0$ to 1000$ hardware cost.

 

min 100W rms

 

Thank You!

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post #2 of 6
1/23/12 at 2:21pm

What is the sensitivity of your speakers?

100W into what load?

Does the $1000 include enclosure, heatsinks, and power supplies?

Do you need a pcb available or can you make your own?

 

Also diyaudio is probably better suited for speaker related questions.

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post #3 of 6
1/24/12 at 4:35am
Thread Starter 

I don't have the speakers yet, i'm thinking of making the amp first, then buying the speakers.

 

the load you are saying is the ohm resistence of speakers?  

 

i don't need enclosure(but im making one, wood maybexD), i have a lot of heatsinks and i can cut them to fit,

maybe i will need power supply, but i have a nice eletronics shop in my city, so i think the project will have the specifications of what i need.

 

I prefer pcb available, but if i realy need, i have a friend who already made his, and he can help me.

 

 

I see people talking about a transformer after the amp, is it necessary?

different transformers will let me use iem's, cans?

 

Thank You a lot for that link! I will start the project on 13 fev, i only have time for proper reading after.

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post #4 of 6
1/24/12 at 6:50am

The load would be the resistance of the speakers. This matters because the same voltage into a 4 ohm load will require the amp to provide twice the current and therefore produce twice the power as if you were using 8 ohm speakers. I think 100 watts into 8 ohms is a good target, as it will allow you to power all but the most insensitive speakers well and should allow reasonable heatsinking options. Of course if your speakers are very sensitive (say higher than 95 dB @ 1watt @ 1m) then 100 watts may be more than you need.

 

It is good that you already have case materials and heatsinks, as those can be some of the more expensive parts of the amp. Transformers requirements depend on amp topology. I suppose they could allow you to use the amp with headphones as well.

 

Most of the projects at diyaudio you have to catch at the right moment to get in on a board run. There are lots of kits available for gainclone/chipamp type amplifiers, but I don't think you will be able to get your desired power out of them. A class D amp might be a good option, but I have no idea what is available as a kit. There is a class D section at diyaudio that I'm sure has more info.

 

One option that I will strongly consider when I build a speaker amp is AMB's beta24. It is a class AB design that can supply 170 watts into 8 ohms and I think 300 watts into 4 ohms. It also has readily available boards and support. You can read more about it at AMB's site here: http://www.amb.org/audio/beta24/. You should certainly be able to do it for under $1000 since you already have the case and heatsinks.

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post #5 of 6
1/25/12 at 6:53am
Thread Starter 

Thank You for all that info... one last question, class? is call A better than class B? more power? what is it?

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post #6 of 6
1/25/12 at 7:41am

The amplifier 'class' typically refers to how the output stage of the amplifier operates. Wikipedia can probably do a better job of explaining it than I can: http://en.wikipedia.org/wiki/Class_A_amplifier#Class_A

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