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Old 6th March 2012, 08:51 PM   #1
ultra is offline ultra  Greece
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Default Diy monoblock 700Wrms/2Ω

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.
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Old 6th March 2012, 09:09 PM   #2
ultra is offline ultra  Greece
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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
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Last edited by ultra; 6th March 2012 at 09:12 PM.
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Old 6th March 2012, 09:20 PM   #3
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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.
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Old 6th March 2012, 09:29 PM   #4
ultra is offline ultra  Greece
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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.
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Old 6th March 2012, 09:42 PM   #5
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this amp is class A /AB/D?
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Old 6th March 2012, 09:52 PM   #6
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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.
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Old 6th March 2012, 09:53 PM   #7
ultra is offline ultra  Greece
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Quote:
Originally Posted by enantra View Post
this amp is class A /AB/D?
this is a AB hign fidelity amp.
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Old 6th March 2012, 10:02 PM   #8
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That is a very nice piece - my complements. Lots of clever mechanical solutions. Also your gate drives are symetrical with very little ringing.
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Old 6th March 2012, 10:06 PM   #9
ultra is offline ultra  Greece
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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.
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Old 6th March 2012, 10:10 PM   #10
ultra is offline ultra  Greece
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Quote:
Originally Posted by firechief View Post
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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