psu of 65v to 12v

widi · 15th August 2007, 12:28 PM

hello friends I am constructing an amplifier which is fed on +-65v, and want to feed I modulate of protection of loudspeakers that works to 12v. as I can turn the tension of 65v to 12v? somebody can give an adjustable scheme me of one psu to adapt it to my source of 65v to obtain those 12v.
Thanks and greetings.

Nordic · 15th August 2007, 01:51 PM

Why not just use a small PCB mount transformer... they are realy small, like 2 boxes of matches... and should only be $2 to $4...

AndrewT · 15th August 2007, 02:43 PM

Quote:

Originally posted by widi
.......protection of loudspeakers that works to 12v. as I can turn the tension of 65v to 12v? somebody can give an adjustable scheme me of one psu to adapt it to my source of 65v to obtain those 12v.

Hi,
give us a few clues?
Dual polarity or single.
How many mA @ 12Vdc?
What peak current might be required?
Are there any big current consumers like relays?

widi · 15th August 2007, 04:50 PM

Hi thanks, first of all good is like I have said for a protector of loudspeakers of a multi-channel system and are seven independent protectors with its seven relays, pense to mount an independent source with its transformer since our Nordic friend has said but my problem is that the positive of the protector is the negative of the loudspeakers and I do not want that is no type of noises, for that reason want that the feeding leaves the same source of the amplifiers. The protector of loudspeakers does not surpass the 1.5 amperes, pense in using the famous LM317 but they do not support an entrance of 65v.
I wait for your aid
Thanks and greetings

AndrewT · 15th August 2007, 05:00 PM

answer to question 4 is 1.5Apk,
answer to question 5 is 7 relays.
tell us more.

But first guess is Vdrop = 53V
max current =1.5Apk
Pmax~=80W. i.e. sink on the regulator is bigger than the sink on the main amplifier.

widi · 15th August 2007, 06:05 PM

The total consumption of the circuit with the seven activated relays is of 1,2 amperes RMS, has a circuit of protection by each channel. The power supply of the multi-channel amplifier is of - +65 volts and 45 amperes.
I hope that with these data they serve to you as something

djQUAN · 15th August 2007, 06:09 PM

Quote:

Originally posted by widi
my problem is that the positive of the protector is the negative of the loudspeakers and I do not want that is no type of noises,

simple. use a separate transformer. then a negative supply after that. since it will be isolated, there should be no noise issues.

15th August 2007, 12:28 PM	#1
widi diyAudio Member Join Date: Sep 2006	psu of 65v to 12v hello friends I am constructing an amplifier which is fed on +-65v, and want to feed I modulate of protection of loudspeakers that works to 12v. as I can turn the tension of 65v to 12v? somebody can give an adjustable scheme me of one psu to adapt it to my source of 65v to obtain those 12v. Thanks and greetings.

15th August 2007, 04:50 PM	#4
widi diyAudio Member Join Date: Sep 2006	psu of 65v to 12v Hi thanks, first of all good is like I have said for a protector of loudspeakers of a multi-channel system and are seven independent protectors with its seven relays, pense to mount an independent source with its transformer since our Nordic friend has said but my problem is that the positive of the protector is the negative of the loudspeakers and I do not want that is no type of noises, for that reason want that the feeding leaves the same source of the amplifiers. The protector of loudspeakers does not surpass the 1.5 amperes, pense in using the famous LM317 but they do not support an entrance of 65v. I wait for your aid Thanks and greetings

15th August 2007, 05:00 PM	#5
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	answer to question 4 is 1.5Apk, answer to question 5 is 7 relays. tell us more. But first guess is Vdrop = 53V max current =1.5Apk Pmax~=80W. i.e. sink on the regulator is bigger than the sink on the main amplifier. __________________ regards Andrew T.

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15th August 2007, 06:05 PM	#6
widi diyAudio Member Join Date: Sep 2006	The total consumption of the circuit with the seven activated relays is of 1,2 amperes RMS, has a circuit of protection by each channel. The power supply of the multi-channel amplifier is of - +65 volts and 45 amperes. I hope that with these data they serve to you as something

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