need a circuit of a single +5V power supply using LM317T - diyAudio
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Old 26th April 2002, 03:26 PM   #1
jarthel is offline jarthel  Australia
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Default need a circuit of a single +5V power supply using LM317T

Anyone has this? I've read the PDF but what they have is one with electronic shutdown. I need a basic +5V supply.

It's for Elso's Kwak-clock +5V supply. Elso suggested an LT1086 but I already have an LM317T and I want to make use of what I already have. Thank you.

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Old 26th April 2002, 03:58 PM   #2
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220 + 680 ohm gives you 5.11 V
270 + 820 = 5.046 V

You must have rather low value of the feedback resistor, between "output" and "adjust".

Check the first page of the datasheet.

http://www.national.com/ds/LM/LM117.pdf

See also my power supply for my headphone amps.

http://home.swipnet.se~/w-50719/hifi/qrv02
http://home.swipnet.se~/w-50719/hifi/qrv03

For those of you who wants to calculate min-max values (including tolerances) for LM317 send me an email. I have made an Excel file for this calcualtion.
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Old 26th April 2002, 04:18 PM   #3
jarthel is offline jarthel  Australia
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nice seeing you here Peranders.

Well after I posted this thread I came across LM2940T-5; a fixed +5V voltage regulator. Do you think this is a better solution than using a variable regulator like the LM317T?

I'm thinking of using a 10000uF 10V electrolytic. What's the difference if I use 100uF or 1000uf instead of 10000uF? Would it be better if I used 10000uF instead?

Thanks

jayel
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Old 27th April 2002, 09:57 PM   #4
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The LM2940T-5 is a switching regulator and it doesn't dissipate a lot of heat.

When selecting what capacitor to use for DC filtering, look for what the IC recommends on DC filtering. I think either 100uf or 1000uf is good. The power supply is not too great so 10000uf will not help much.
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Old 28th April 2002, 01:33 AM   #5
jarthel is offline jarthel  Australia
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Is an LM317T a switching regulator? Thanks

Jayel
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Old 28th April 2002, 01:40 AM   #6
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Quote:
Originally posted by jarthel
Is an LM317T a switching regulator? Thanks

Jayel
No, it's a linear regulator. I personally would prefer LM317 over a fixed or switching regulator.
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Old 29th April 2002, 07:50 AM   #7
jarthel is offline jarthel  Australia
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Are all fixed voltage regulators switching?

Thanks
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Old 29th April 2002, 08:19 AM   #8
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Old 29th April 2002, 12:32 PM   #9
jarthel is offline jarthel  Australia
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I have a look at the first page of the LM317 datasheet. There's a sample circuit there to built a circuit based on the voltage needed.

The only problem is Vin says >=+28V. The LM317 is going to be used as a power supply for the Kwak-clock. I don't think I can get +28V inside a CD player.

Is there any way to input <=+12V and get +5V using LM317.

Thank you.

Jayel
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Old 29th April 2002, 12:42 PM   #10
sonnya is offline sonnya  Denmark
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You do not need 28V to get 5Volt out of the LM317!!

You only need a voltage drop of 3 Volt across the LM317 (From Vin to Vout).

But it will work up to 40V on the input depending on you current consumption and the size of your heatsink or lack of heatsink.

Sonny
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