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Old 12th September 2010, 07:21 AM   #11
Elvee is offline Elvee  Belgium
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Originally Posted by nightanole View Post
I cant unwind the transformer. Its also used in another project that needs the 35 volts. This is just me using 1 high quality power supply for 2 amps (since im incapable of listening to 2 amps at the same time).

Hmm the amp4 uses a tp2050 which has a max voltage rating of 35 volts. I might be able to just get away with replacing the 35 volt on board caps with higher voltage units.

Lets see, 2 10k high ripple caps, 1 300uf low esr cap, 2 1500uf low esr caps.
Diodes like 1N5404 are dirt cheap. They are specified for 3A continuous current, but for audio applications it's OK, as you will never draw 5A permanently.
Make a string of 8 to 12 of them, leaving the leads uncut so they can act as heatsink.
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Old 12th September 2010, 12:34 PM   #12
nightanole is offline nightanole  United States
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Man them are dirt cheap everywhere but mouser/digikey. I can get 10 for 3 bucks shipped at most places, digikey wants over 50 cents each. Another thing i found was using some 50 cent bridge rectifiers, they are 50 cents each and drop at least a volt.

Well thanks guys for shooting me some ideas.
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Old 12th September 2010, 02:52 PM   #13
Speedskater is offline Speedskater  United States
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I would think that adding a small boost/buck transformer is easier than rewinding the main transformer.
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Old 12th September 2010, 02:55 PM   #14
Andrew Eckhardt is offline Andrew Eckhardt  United States
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Not if it's a toroid. A toroid is just sitting there waiting for you to put a buck winding on it. You don't need another primary and another core.
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Old 12th September 2010, 04:07 PM   #15
star882 is offline star882  United States
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You can also use a buck converter.
"Fully on MOSFET = closed switch, Fully off MOSFET = open switch, Half on MOSFET = poor imitation of Tiffany Yep." - also applies to IGBTs!
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Old 13th September 2010, 01:54 PM   #16
random007 is offline random007  Australia
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Just another alternative: a simple high current customisable regulator Pre-Regulator
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Old 13th September 2010, 02:10 PM   #17
AndrewT is offline AndrewT  Scotland
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a capacitor multiplier gives a near fixed voltage drop across it.

If you adjust the resistors you can dial up just about any voltage drop.

Normally a multiplier is used with just 1.5V to 2.5V drops to allow for ripple when high currents are demanded.

But they work just as well when set up to drop more voltage.
But, then they dissipate more power. You will need heatsinks on the power output devices.
regards Andrew T.
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