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Old 19th May 2005, 08:59 PM   #11
jleaman is offline jleaman  Belgium
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Maybe your confused. 'Im building regulated psus for a 40v amp and another for the mini a's. : O ) so all i'll have to do then is change the parts that are needed ?
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Old 19th May 2005, 09:04 PM   #12
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I'm not confused, are you?

Yes, you just need to change the zeners to get the voltage you want. You may need to check that the 240s are stiil in their SOA if you plan to pull a particularly high current from them.
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Old 19th May 2005, 09:18 PM   #13
jleaman is offline jleaman  Belgium
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my Blue amps only pull a few amps and i hardly crank them. There not for subwoofers or any thing witha hi load. Just a simple amp that id like to see if regulated makes any difrence at all. What does SOA mean ?
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Old 19th May 2005, 09:21 PM   #14
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Safe Operating Area. It is shown as a graph of current against voltage on the datasheets.
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Old 19th May 2005, 09:26 PM   #15
jleaman is offline jleaman  Belgium
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Quote:
Originally posted by pinkmouse
Safe Operating Area. It is shown as a graph of current against voltage on the datasheets.

AHH i see thanks..

Got any ideas for what other devices i can use just to be safe ?
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Old 19th May 2005, 09:31 PM   #16
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Sorry Jason, I'm not hugely familiar with mosfet types. Still, I'm sure someone here can advise.
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Old 19th May 2005, 09:48 PM   #17
Coulomb is offline Coulomb  England
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Can't you design the regulator to piggy back onto BrianGT's power supply boards to avoid yet more capacitors. Maybe you could make it so you can connect it between the first and second bank of caps where the inductors ar bridged or load resistors.

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Old 19th May 2005, 09:52 PM   #18
jleaman is offline jleaman  Belgium
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That is also a idea. : O ) Il try that too Anthony...
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Old 20th May 2005, 09:22 AM   #19
steenoe is offline steenoe  Denmark
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Quote:
For 20V rails, just use two 10V zeners per side, and link the unused pads. For 40V, use two 20V zeners per side.
The Fets dispose at least 4 volts, so you need to add that to the zener string.

Quote:
4) Onboard Bridge Rectifier's using a bridge or Fred's.
A regulator like this is meant to sit after a raw supply, so you dont want the diodes here.

Quote:
Maybe you could make it so you can connect it between the first and second bank of caps where the inductors ar bridged or load resistors.
I dont think it is a good idea with big caps after the reg. It might oscilate.

You might want to check if it is possible to make a output sensing
connection (to the amps output) to modulate the supply's voltage. This will increase the amps overall efficiency.

Steen

Edit. You dont need 1000uF caps for this application. 220uF is enough. the circuit works as a capacitance multiplier.
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Old 20th May 2005, 07:09 PM   #20
steenoe is offline steenoe  Denmark
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BTW. I think this thread should be in the power supply department??


Steen
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