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Old 17th January 2007, 02:40 PM   #1
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Default 5V buffer for lm3886?

i will be running my lm3886s off of a switching psu which also has 3V and 5V outputs. i was planning on using the 3V to seperately power LEDs and such, and i was wondering if anyone knew of a simple buffer that would be happy running off of a 5V supply?
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Old 17th January 2007, 06:15 PM   #2
Minion is offline Minion  Canada
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There are many Opamps that you can use as a Unity Gain Buffer that can run off of Low Voltages.....

Like maybe a LT6202 or even the TL081....

You can even use some Transistors or Fets as a Buffer which will hapilly run at low Voltages...It would probably be better if your Supply can supply +/-5v so you don"t have to worry about Bias Voltages or DC Offset.....

Good luck


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Old 18th January 2007, 12:20 AM   #3
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Default Re: 5V buffer for lm3886?

Quote:
Originally posted by jesserparker
i will be running my lm3886s off of a switching psu which also has 3V and 5V outputs. i was planning on using the 3V to seperately power LEDs and such, and i was wondering if anyone knew of a simple buffer that would be happy running off of a 5V supply?

Not realy. remember that the buffer, even a TL072 will not swing to rails, in fact it will go to rail less 1 volt. If you have only 5V the maximum signal out of the buffer will only reach 3V p-p before severe gain compression. Overdriving this preamp will be to easy, you need more headroom.

My opinion only.

Ciao Nico
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Old 19th January 2007, 06:38 PM   #4
Minion is offline Minion  Canada
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You can turn that 5v into 15v if you use a Voltage Tripler...

This should explain how to do it....

http://www.play-hookey.com/ac_theory...ltipliers.html


Just make sure that the 5v you are getting is has a LOT more current that you need because at Tripple the Voltage you will have about 25% the current available.....


Just a Thought....
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Old 19th January 2007, 06:46 PM   #5
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Default buffer PS

Just build a simple shunt regulator, 1 to 1.2K ohm resitor and zener diode and some filtering.
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Old 19th January 2007, 09:53 PM   #6
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i would totally do that, if i knew what that was.
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Old 19th January 2007, 09:56 PM   #7
Nordic is offline Nordic  South Africa
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basicaly a voltage divider made up of a zener and resistor in series... to set voltage and current... not ideal, but better than nothing.
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Old 19th January 2007, 11:52 PM   #8
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Default shunt regulator

Click the image to open in full size.
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Old 20th January 2007, 06:43 AM   #9
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Default Re: shunt regulator

Quote:
Originally posted by halo0925
Click the image to open in full size.

hi Halo,

I think I am a little stupid. How does this work. If I am not mistaken, the zeners conduct like normal forward biased diodes I do not see how one derives the +15V and -15V from this circuit. Please explain.

Kind regards

Nico
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Old 20th January 2007, 06:52 AM   #10
Nordic is offline Nordic  South Africa
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I agree... unless the 1k1 is dropping another 11V
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