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Old 27th September 2012, 03:46 PM   #1
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Default Need Schematic for InPhase IPA400

Hello, i need a schematic or service manual for the amplifier InPhase IPA400.
i've searching all the internet without results.

Thanks a lot!
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Old 27th September 2012, 05:08 PM   #2
ultra is offline ultra  Greece
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Whats the problem with this amp?
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Old 28th September 2012, 02:57 PM   #3
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I want to increase the output voltage to the power transformer but the TL494C have many protections arround, so i try increase the voltage from positive rail with resistor to pin 1 of TL494C without results.
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Old 28th September 2012, 04:07 PM   #4
ultra is offline ultra  Greece
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Can you post a good pic of the board?

Many people may try to help you
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Old 28th September 2012, 07:18 PM   #5
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Sure.
Take some pictures from net and tomorrow i will post more pics about my amp.
Thanks a lot.
Click the image to open in full size.Click the image to open in full size.
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Old 28th September 2012, 07:43 PM   #6
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Most amps that use this basic design (from that I can tell from the limited resolution) have unregulated power supplies. If you have a variable voltage power supply. Measure the DC voltage with the black probe on leg 3 of the power supply FET and the red probe on leg 1 of the power supply FET. If the voltage decreases when you reduce the voltage, the supply is likely unregulated. If the voltage goes up when the DC input voltage is decreased, it's likely regulated.

If it's unregulated, the only way to increase the voltage is to add turns to the secondary windings of the transformer. You should be aware that this is likely to make the amp run hotter and will likely make it less reliable if it's driven to full power for more than a few minutes at a time.
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Old 2nd October 2012, 07:12 PM   #7
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It's unregulated....

So your opinion is to make a diy amplifier from zero or to add turns to secondary of the transformer (with reduse the quiecent current and offset etc.)?
My opinion is to make a fresh amplifier from start with my needs....?
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Old 2nd October 2012, 09:20 PM   #8
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I don't know what your objective is. If it's to learn, add the windings and test to see what happens and how the amp performs. If it's simply to have a more powerful amp, I'd suggest buying a suitable new or used amp. If you really want to learn, mod this one then build one of your own.
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