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darkm4n 14th October 2003 07:22 PM

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 .

markp 14th October 2003 08:30 PM

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.

darkm4n 14th October 2003 09:06 PM

Could you ... ?
Hi ,

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

I can't find it .


darkm4n 14th October 2003 09:29 PM

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 .


markp 14th October 2003 09:32 PM

2 Attachment(s)
here is the v reg

darkm4n 14th October 2003 09:41 PM

Nope ...
This is for 60 V .. i need one for 40 V . Thanks

markp 14th October 2003 10:06 PM

Change the zener voltage.

markp 14th October 2003 10:08 PM

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.

darkm4n 15th October 2003 10:20 AM

Heh ??
Where is that pot ??

peranders 15th October 2003 10:37 AM

darkm4n, what is your purpose of all this? High current?

What is 40 volts used for?

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