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-   -   Diy monoblock 700Wrms/2Ω (http://www.diyaudio.com/forums/car-audio/208275-diy-monoblock-700wrms-2-a.html)

ultra 6th March 2012 08:51 PM

Diy monoblock 700Wrms/2Ω
 
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The amplifier I am presenting is the outcome of 8 months work.

This amp as well as its bigger - stereo version, took me 3 months just for the layout.

The case comes from a 12>220V inverter.

ultra 6th March 2012 09:09 PM

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the dimensions of the hand made pcbs were tailored to the internal size of the case.

The pcbs come from photo sensitive Presensitized boards.

Then, i used liquid tinn and a special laquer to protect the uderside of the board

ultra 6th March 2012 09:20 PM

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One of the main goals was to keep the resistance of the circuit as low as

possible

due to the high currents that flow.

In the past i have used brass sheets, cut in a cnc machine to strenghten the

high current areas of the board.

This time i thought of busbars. Actually, not custom made, but the type readily

available to market.

ultra 6th March 2012 09:29 PM

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The implementation of the power supply looks like this.

Unfortunately, i had to remake that pcb as the trafos of the first version werent

big enough.

So, you are going to see pics of both pwm.

enantra 6th March 2012 09:42 PM

this amp is class A /AB/D?

ultra 6th March 2012 09:52 PM

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The difference from other pwm is the high oscillating frequency.

Although this is a typical push pull designs, it took me 4 versions to implement

the fast gate drive circuit.

The control is made of smd parts and it is a small board perpendicularly attached

to the main board.

The pic shows the gate drivers at 240KHz.

ultra 6th March 2012 09:53 PM

Quote:

Originally Posted by enantra (Post 2935953)
this amp is class A /AB/D?

this is a AB hign fidelity amp.

firechief 6th March 2012 10:02 PM

That is a very nice piece - my complements. Lots of clever mechanical solutions. Also your gate drives are symetrical with very little ringing.

ultra 6th March 2012 10:06 PM

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the input choke is calculated for 150A.

Both trafos are calculated for the same current,

and the secondary winding is 12A per rail.

After the double full bridge circuit, there are two cmc chokes

and a big capacitance bank.

The secondary is isolated from the primary side.

ultra 6th March 2012 10:10 PM

1 Attachment(s)
Quote:

Originally Posted by firechief (Post 2935990)
That is a very nice piece - my complements. Lots of clever mechanical solutions. Also your gate drives are symetrical with very little ringing.

Thank you for your comments.

Actually, i did went up to 400KHz, but for safety reasons i changed it.


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