Make a power supply - Electronic Circuits Projects Diagrams Free

coolrfid · 8th May 2008, 04:41 PM

For my project i have to use power supplies of +/-12v, +5V & +12v. Can i use a transformer & voltage regulator ICs to create this instead of using huge power supplies provided by college? Can u pls provide me the circuit diag for this?

aljamri · 8th May 2008, 07:43 PM

http://www.generalguitargadgets.com/...bipolar_ps.pdf

speakerguy79 · 8th May 2008, 08:52 PM

Yes.

You will need an AC-AC wall adapter of at least 12VAC more would be better.

Use a voltage doubler type rectifier to get +/- ~15VDC. Use 7805, 7812, 7912, and 7812 to get +5, +12, -12, and a separate +12 in that order.

http://sound.westhost.com/project05.htm

That is the basic circuit, except you will use the regulators to the +/- 12V as well as the other voltages. You can use multiple regulators on the unregulated + line to get multiple regulated positive voltages. It is also very safe as the AC-AC transformer is double insulated and low current.

mneary · 8th May 2008, 11:22 PM

The ggg project is missing the diodes (4 of them total) protecting the regulator.

But you need to consider the required current before you design anything. At 50-100 mA, these designs are pretty good, but much higher and you've got to do some math.

8th May 2008, 04:41 PM	(permalink)
coolrfid New Member	Make a power supply For my project i have to use power supplies of +/-12v, +5V & +12v. Can i use a transformer & voltage regulator ICs to create this instead of using huge power supplies provided by college? Can u pls provide me the circuit diag for this?

8th May 2008, 07:43 PM	(permalink)
aljamri Experienced Member	http://www.generalguitargadgets.com/...bipolar_ps.pdf __________________ Its what your friend in Your mind, what you in your friends mind

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8th May 2008, 08:52 PM	(permalink)
speakerguy79 Experienced Member	Yes. You will need an AC-AC wall adapter of at least 12VAC more would be better. Use a voltage doubler type rectifier to get +/- ~15VDC. Use 7805, 7812, 7912, and 7812 to get +5, +12, -12, and a separate +12 in that order. http://sound.westhost.com/project05.htm That is the basic circuit, except you will use the regulators to the +/- 12V as well as the other voltages. You can use multiple regulators on the unregulated + line to get multiple regulated positive voltages. It is also very safe as the AC-AC transformer is double insulated and low current.

8th May 2008, 11:22 PM	(permalink)
mneary Experienced Member	The ggg project is missing the diodes (4 of them total) protecting the regulator. But you need to consider the required current before you design anything. At 50-100 mA, these designs are pretty good, but much higher and you've got to do some math.