Is it possible to build a 2 box pre-power for under 400 - diyAudio
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Old 30th January 2013, 07:43 AM   #1
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Question Is it possible to build a 2 box pre-power for under 400

Disclaimer
I'm afraid I have no electronic engineering experience nor any skills in DIY electronic audio so please excuse the following, possibly naive questions.


The goal

[Re]Produce a two box system similar to the late 80's Naim pre/power combinations. Try and recapture that "British" sound - please don't ask me to quantify that at this stage!

Cost effective, quality not necessarily esoteric.

Must have modest power and not be too fussy about the cable or speakers unlike it's earlier Naim cousins.

Must fit the old Naim shoebox size.

Why not just buy a second hand Naim system? Well the following:


Requirements

The Pre-Amplifier must contain a good quality DAC for digital inputs as well as a good quality phono stage. The inputs must be balanced to provide the same volume to the amplifier so you don't have to constantly adjust volume.

Is switching of inputs required? Surely no one uses several sources at once so is this required for electrical/sonic reasons?

The power amplifier must be of good quality and run reasonably cool if possible, to avoid use of heat sinks other than the case itself. Perhaps modest power of 30w - 40w per channel into 8ohms?

No fancy connectors or exotic cabling, just good quality.

I'm really interested to find out if anyone is willing to support this project? For my part I am happy to contribute towards material costs, the cases and the product design.
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Old 30th January 2013, 07:51 AM   #2
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Better off going to a thrift shop - you are unlikely to build much at that cost.
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Old 30th January 2013, 07:58 AM   #3
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Quote:
Originally Posted by KatieandDad View Post
Better off going to a thrift shop - you are unlikely to build much at that cost.
LOL OK, and to be helpful what sort of cost would satisfy the criteria?
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Old 30th January 2013, 08:16 AM   #4
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You need a switch. You don't want two inputs to "see" each other. If both sources are active one will act as a filter on the other. I can't help you with the build, but I think it's possible. There are lots of cheap constructions that sound really well. A good chip amp, A flexible phono stage from maybe RJM audio (he have a very small one). I'm not experienced with DAC's, but there are plenty out there. You just match the phonostage output and DAC. I don't think some fancy input sensing circuit is needed. Some recordings are louder than others of course, but that's life.
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Old 30th January 2013, 08:24 AM   #5
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Quote:
Originally Posted by Kjeldsen View Post
You need a switch. You don't want two inputs to "see" each other. If both sources are active one will act as a filter on the other. I can't help you with the build, but I think it's possible. There are lots of cheap constructions that sound really well. A good chip amp, A flexible phono stage from maybe RJM audio (he have a very small one). I'm not experienced with DAC's, but there are plenty out there. You just match the phonostage output and DAC. I don't think some fancy input sensing circuit is needed. Some recordings are louder than others of course, but that's life.
Thank you that's very helpful and really encouraging!!!
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Old 30th January 2013, 08:35 AM   #6
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Default Easy

It is easy to build a P/P amp for under $400.
My suggestion (other would disagree of cause) go to Ebay
Buy a
Power Amp 2X50-W STEREO CLASS-D AUDIO POWER AMPLIFIER circuit board TI TPA3123 - Item No 400354376467.
Pre Amp - Pass Fet Clone, also available on Ebay.
Add a 2 Boxes, swithches, 24volt DC SM power supply and RCA's and you have a unit that will out perform a commercial P/P amp costing up to $4000
.
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tabarddn
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Old 30th January 2013, 09:02 AM   #7
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But it's only possible if you get i right the first time

The speaker and amps I'm currently building are really cheap- 6 channel amp incl. PSU = 100$, and loudspeaker will be another 200$.

But if I count in all the other stuff I have build or blown up, it's another price
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Old 30th January 2013, 01:07 PM   #8
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Anyone want to give it a go? Perhaps if I visualise and post up some designs?
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