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Old 14th October 2003, 06:22 PM   #1
darkm4n is offline darkm4n  Romania
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Default Redicing Voltage in a safe way.

Hi ,

Maybe this trand it's a little stupid .. i'am a begeiner and i have to admit i don't know fundamental stuff ...

How i can reduce the voltage from a 2x38 VAC 500 VA Toroidal transformer , filtered and stabilized at 55 V to 40 V or even 45 V in a safe way .
Adding some resistors ???

Thank's . Mihai .
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Old 14th October 2003, 07:30 PM   #2
markp is offline markp  United States
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Use a voltage regulator circuit like the one from The Audio Amatuer for the GFA-555 amp. Do a search and you will find the schematic on line here. It does a great job and is easy to build.
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Old 14th October 2003, 08:06 PM   #3
darkm4n is offline darkm4n  Romania
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Default Could you ... ?

Hi ,

Could you post the schematic here
? Please ... ?

I can't find it .

Thanks
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Old 14th October 2003, 08:29 PM   #4
darkm4n is offline darkm4n  Romania
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Default Or ...

Or somebody alse if everyone know a good 40 V DC regulator for a 400 W amplfiere ( high current needed ) please help .. or other method of reducing voltage .

Thanks
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Old 14th October 2003, 08:32 PM   #5
markp is offline markp  United States
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here is the v reg
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Old 14th October 2003, 08:41 PM   #6
darkm4n is offline darkm4n  Romania
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Default Nope ...

This is for 60 V .. i need one for 40 V . Thanks
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Old 14th October 2003, 09:06 PM   #7
markp is offline markp  United States
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Change the zener voltage.
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Old 14th October 2003, 09:08 PM   #8
markp is offline markp  United States
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It is very adjustable with the pot and using different ref voltages(zener) and handles lots of current with most any decent output transistor. I've used mjl21193/4, 2sa1302/2sc3281, mj15003/4 and many others.
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Old 15th October 2003, 09:20 AM   #9
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Default Heh ??

Where is that pot ??
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Old 15th October 2003, 09:37 AM   #10
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darkm4n, what is your purpose of all this? High current?

What is 40 volts used for?
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