Battery-powered supplies - Page 22

carlos671 · 6th February 2006, 01:21 PM

Hi, i was wondering if anyone can help me. I want to build an 18v batt psu for my graham slee phonostage but don't know where to start. After reading a few posts i'm thinking 2 x 12v SLAs with a voltage regulator and some smoothing caps. Put then i'm stuck, what order what values, what else? all help would be greatly appreciated.

Cheers

carlos671

Nuuk · 6th February 2006, 01:33 PM

First question is does the phono stage use a single rail supply?

carlos671 · 6th February 2006, 01:41 PM

on looking at my wall wart i actually need a 24v power supply. where would i find out about that nuuk? the internet is a minefield

Nuuk · 6th February 2006, 04:24 PM

Well we need to know a bit more! The wallwart supplies 24 volts but is that what is used? Or is the voltage regulated down to say 18 volts? Do you have any documentation?

carlos671 · 7th February 2006, 07:58 PM

i measured the psu with my multimeter and it was kickin out 31.5 volts. Do u know a good place to learn about electronics? what is the diff between dual and single rail? When i do searches i jus get loadsa computer stuff.

Cheers

peranders · 7th February 2006, 08:08 PM

Single rail = two wires from the PS, + and - but this requires a big capacitors in series with the speaker, not so good.

Duoble rial = three wires from the PS, +, 0 and - The normal thing.

I really recommend that you take a good look in the datasheet for the LM3886 and also check the application note AN-1192 because there you have all basic info about "Gainclones".

Nuuk · 7th February 2006, 08:21 PM

Learning about all this is really a question of time and research. I try to make things simple to understand on Decibel Dungeon!

You could also try Googling for 'electonics theory' and if you add 'beginners' you should find plenty to get you going.

carlos671 · 8th February 2006, 07:23 AM

i emailed graham slee about the psu. Yes it is a single rail design. What is the nxt step regarding the psu?

Nuuk · 8th February 2006, 08:02 AM

Being sure of the correct voltage!

carlos671 · 8th February 2006, 11:43 AM

measuring with my multimeter i got 31.5 volts

6th February 2006, 01:21 PM	#211
carlos671 diyAudio Member Join Date: Oct 2005	batt psu for my phono stage Hi, i was wondering if anyone can help me. I want to build an 18v batt psu for my graham slee phonostage but don't know where to start. After reading a few posts i'm thinking 2 x 12v SLAs with a voltage regulator and some smoothing caps. Put then i'm stuck, what order what values, what else? all help would be greatly appreciated. Cheers carlos671

6th February 2006, 01:33 PM	#212
Nuuk diyAudio Member Join Date: Feb 2003 Location: Somerset, SW England	First question is does the phono stage use a single rail supply? __________________ The truth need not be veiled, for it veils itself from the eyes of the ignorant.

6th February 2006, 01:41 PM	#213
carlos671 diyAudio Member Join Date: Oct 2005	closer inspection on looking at my wall wart i actually need a 24v power supply. where would i find out about that nuuk? the internet is a minefield

6th February 2006, 04:24 PM	#214
Nuuk diyAudio Member Join Date: Feb 2003 Location: Somerset, SW England	Well we need to know a bit more! The wallwart supplies 24 volts but is that what is used? Or is the voltage regulated down to say 18 volts? Do you have any documentation? __________________ The truth need not be veiled, for it veils itself from the eyes of the ignorant.

7th February 2006, 08:08 PM	#216
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	Single rail = two wires from the PS, + and - but this requires a big capacitors in series with the speaker, not so good. Duoble rial = three wires from the PS, +, 0 and - The normal thing. I really recommend that you take a good look in the datasheet for the LM3886 and also check the application note AN-1192 because there you have all basic info about "Gainclones". __________________ /Per-Anders (my first name) or P-A as my friends call me Tube Buffered Gainclone in work \|Thread


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7th February 2006, 07:58 PM	#215
carlos671 diyAudio Member Join Date: Oct 2005	i measured the psu with my multimeter and it was kickin out 31.5 volts. Do u know a good place to learn about electronics? what is the diff between dual and single rail? When i do searches i jus get loadsa computer stuff. Cheers

7th February 2006, 08:21 PM	#217
Nuuk diyAudio Member Join Date: Feb 2003 Location: Somerset, SW England	Learning about all this is really a question of time and research. I try to make things simple to understand on Decibel Dungeon! You could also try Googling for 'electonics theory' and if you add 'beginners' you should find plenty to get you going. __________________ The truth need not be veiled, for it veils itself from the eyes of the ignorant.

8th February 2006, 07:23 AM	#218
carlos671 diyAudio Member Join Date: Oct 2005	i emailed graham slee about the psu. Yes it is a single rail design. What is the nxt step regarding the psu?

8th February 2006, 08:02 AM	#219
Nuuk diyAudio Member Join Date: Feb 2003 Location: Somerset, SW England	Being sure of the correct voltage! __________________ The truth need not be veiled, for it veils itself from the eyes of the ignorant.

8th February 2006, 11:43 AM	#220
carlos671 diyAudio Member Join Date: Oct 2005	measuring with my multimeter i got 31.5 volts

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