Hello, i need a schematic or service manual for the amplifier InPhase IPA400.
i've searching all the internet without results.
Thanks a lot! 🙂
i've searching all the internet without results.
Thanks a lot! 🙂
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.
Sure.
Take some pictures from net and tomorrow i will post more pics about my amp.
Thanks a lot.
Take some pictures from net and tomorrow i will post more pics about my amp.
Thanks a lot.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
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.
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.
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....?
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....?
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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