500-1000W 8 OHM L50 Full Bridge Amp - diyAudio
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Old 8th May 2014, 03:56 AM   #1
ljm_ljm is offline ljm_ljm  China
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Join Date: Sep 2006
Default 500-1000W 8 OHM L50 Full Bridge Amp

I've been thinking about for high power high performance amplifier. What way is the real meet demand.
It needs to accord with the real output power, rather than write letters we casually.

It needs very good reliability. I tried to use in this field about, L15, L12 field-effect tube, etc.

Customers and friends really need to use them, and feedback to me the information of sound.

I have prepared a long time, to choice all kinds of circuit, as well as the components of collocation.

It must be very simple, must be very reliable. And it must have a good voice.

The performance of the L50 may still not reached me. But this is my take a long time to answer.
This is a photo.

I hope others can understand it.

It is composed of two identical amplifier. Each amplifier using two groups IRFP140 IRFP9140.
Because it requires a simple installation test, it is a tradition in L series has been.

Thus it integrates the speaker protection circuit, the use of two 12 a relay on two groups of amplifier dc output to conduct a comprehensive and reliable protection.

And it integrates the op-amp circuit level before. Former level gain for 5 times.

Former level jointly with the protection circuit using a set of AC12-0-12 v power supply. Using 7812 and 7812 voltage regulator IC.
Since L50 is made up by L15 circuit architecture, so its performance is the same with me.

It works very well. And has a good performance and reliability of any parameters.
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File Type: jpg L50-1.jpg (470.0 KB, 283 views)
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Old 8th May 2014, 04:03 AM   #2
ljm_ljm is offline ljm_ljm  China
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After the installation is complete,
I was tested for it.


Turn on the juice and we measure the voltage of power supply in the first place.

It is + - 54 v dc.

Then I measure separately the two amplifier amplification module, waveform.

Use double trace oscilloscope.


We can see. It works very well. And the two modules are the same.

This is because the two modules I used exactly the same components, as well as the PCB wiring.

Is completely COPY.

Why I didn't use the appearance more beautiful symmetrical component placement.

Because the two modules will produce the error.
Attached Images
File Type: jpg L50-2.jpg (539.2 KB, 266 views)
File Type: jpg L50-3.jpg (531.3 KB, 241 views)
File Type: jpg L50-4.jpg (507.5 KB, 222 views)
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Old 8th May 2014, 04:24 AM   #3
ljm_ljm is offline ljm_ljm  China
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We continue to test.

Two modules the right signals should have 180 degree transformations. And the same signal.
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Old 8th May 2014, 04:41 AM   #4
ljm_ljm is offline ljm_ljm  China
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Progress in a test the stability of the power amplifier is very important.

Square corrugated rising graphics is very important to me. When I use it to determine amplifier working in the limit of reliability.
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Old 8th May 2014, 04:42 AM   #5
ljm_ljm is offline ljm_ljm  China
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Because of using circuit is L15 L12 are using mature and reliable circuit. So the question is not big.
The waveform is very beautiful.
The SR in balance when can reach 38 v/US

Important test. Measuring the first power supply voltage of the power amplifier. + - 54 v.

And then increase the signal input.

The signal input is: 800 mv
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Old 8th May 2014, 04:45 AM   #6
ljm_ljm is offline ljm_ljm  China
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Chopped output voltage, output voltage of + - 100V。



Output when chopped for real output of the power amplifier distortion voltage value. Can also calculate the power amplifier real actual effective power:
L50 chopped voltage at + - 100 v.
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Old 8th May 2014, 04:49 AM   #7
ljm_ljm is offline ljm_ljm  China
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We rotate the signal amplitude, let him work in distortionless condition.

A little bit to reduce signal. At this point about 0.8 V input. The output 100 v

VOLTAGE GAIN =125


About power can be calculated. About 610 w 8 OHM
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File Type: jpg ????9.jpg (31.7 KB, 24 views)

Last edited by ljm_ljm; 8th May 2014 at 05:04 AM.
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Old 8th May 2014, 04:52 AM   #8
ljm_ljm is offline ljm_ljm  China
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Join Date: Sep 2006
I will continue to test this L50, improvement.

So temporarily won't have sales on the Internet. Anyone is welcome to give directions.

I would have taken the time to put on the updated information. I hope it can let more people inspired.

I think the class AB amplifier than class D amplifier is more suitable for the application of professional.

It has better reliability. And it has a good performance.

It is better than digital amplifier with low frequency. Can work at 10 HZ or 100 k HZ

It is a real 500 w amplifier 8 ohms.

Rather than just write the Numbers. It works at + - 50 v voltage can satisfy the requirement of 500 w power output.

For the majority of users, can be satisfied.

Last edited by ljm_ljm; 8th May 2014 at 05:02 AM.
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Old 8th May 2014, 10:26 PM   #9
hongrn is offline hongrn  United States
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Just add good documentation and support, and you've got an awesome product.
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Old 17th June 2014, 01:42 PM   #10
ljm_ljm is offline ljm_ljm  China
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Update a few pictures about the appearance of connection diagram.
Attached Images
File Type: jpg L50A-01.jpg (427.5 KB, 67 views)
File Type: jpg L50A-2.jpg (427.2 KB, 70 views)
File Type: jpg L50A-3.jpg (479.4 KB, 67 views)
File Type: jpg ????.jpg (18.6 KB, 70 views)
File Type: jpg L50A-10.jpg (367.8 KB, 114 views)
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