power supply design (12V, -12V and 5V) - Electronic Circuits Projects Diagrams Free

mugzzzzy · 20th April 2004, 06:09 AM

hi,
if any of ya have a design for a power supply that can provide -12,12 and 5v... plz lemme know

ty

niq_ro · 20th April 2004, 06:52 AM

use IC LM7805 for 5V, LM7812 for 12V and LM7912 for -12V.. at Imax=1A search for datasheet of this ICs, eg. http://www.hanssummers.com/electronics/datasheets/

PS: for more power you can use a source AT from a old PC :wink: without more complication just use a bulb lamp 12W/5W at 12V output

Sebi · 20th April 2004, 07:06 AM

The PC supply need load always on 5V output, because the voltage feedback workig from 5V output.

Here is a simple circuit.

niq_ro · 20th April 2004, 08:43 AM

Quote:

Originally Posted by Sebi

The PC supply need load always on 5V output, because the voltage feedback workig from 5V output.

yes, sorry for my mistake

ops:

mugzzzzy · 21st April 2004, 06:16 AM

hi.

ty for the helps...by any chance u have the values of the caps??

thanks a lot

Sebi · 21st April 2004, 07:03 AM

Capacitor's value depend from desired load. 2200uF enough for 500..600mA. The decoupling caps are 100nF.Transformer secondary voltage min. 2*7.5V AC.

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20th April 2004, 06:09 AM	(permalink)
mugzzzzy	power supply design (12V, -12V and 5V) hi, if any of ya have a design for a power supply that can provide -12,12 and 5v... plz lemme know ty

20th April 2004, 06:52 AM	(permalink)
niq_ro	use IC LM7805 for 5V, LM7812 for 12V and LM7912 for -12V.. at Imax=1A search for datasheet of this ICs, eg. http://www.hanssummers.com/electronics/datasheets/ PS: for more power you can use a source AT from a old PC :wink: without more complication just use a bulb lamp 12W/5W at 12V output __________________ see http://www.tehnic.go.ro & http://www.niq.go.ro

21st April 2004, 06:16 AM	(permalink)
mugzzzzy	hi. ty for the helps...by any chance u have the values of the caps?? thanks a lot

21st April 2004, 07:03 AM	(permalink)
Sebi	Capacitor's value depend from desired load. 2200uF enough for 500..600mA. The decoupling caps are 100nF.Transformer secondary voltage min. 2*7.5V AC.