Reducing Voltage in a safe way.

darkm4n · 14th October 2003, 07:22 PM

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

Hi ,

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

I can't find it .

Thanks

darkm4n · 14th October 2003, 09:29 PM

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

markp · 14th October 2003, 09:32 PM

here is the v reg

darkm4n · 14th October 2003, 09:41 PM

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

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?

14th October 2003, 07:22 PM	#1
darkm4n diyAudio Member Join Date: Aug 2003 Location: Bucharest	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 .

14th October 2003, 08:30 PM	#2
markp diyAudio Member Join Date: Oct 2003 Location: L.A., CA	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. __________________ If it sounds good... it is good!

14th October 2003, 09:06 PM	#3
darkm4n diyAudio Member Join Date: Aug 2003 Location: Bucharest	Could you ... ? Hi , Could you post the schematic here ? Please ... ? I can't find it . Thanks

14th October 2003, 09:29 PM	#4
darkm4n diyAudio Member Join Date: Aug 2003 Location: Bucharest	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

14th October 2003, 09:41 PM	#6
darkm4n diyAudio Member Join Date: Aug 2003 Location: Bucharest	Nope ... This is for 60 V .. i need one for 40 V . Thanks


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14th October 2003, 10:06 PM	#7
markp diyAudio Member Join Date: Oct 2003 Location: L.A., CA	Change the zener voltage. __________________ If it sounds good... it is good!

14th October 2003, 10:08 PM	#8
markp diyAudio Member Join Date: Oct 2003 Location: L.A., CA	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. __________________ If it sounds good... it is good!

15th October 2003, 10:20 AM	#9
darkm4n diyAudio Member Join Date: Aug 2003 Location: Bucharest	Heh ?? Where is that pot ??

15th October 2003, 10:37 AM	#10
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden	darkm4n, what is your purpose of all this? High current? What is 40 volts used for? __________________ /Per-Anders (my first name) or P-A as my friends call me. My group buys Super Regulator group buy. 43 pcb's in interest. DCT03 group buy. 39 pcb's in order, 14 paid.

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