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How to get negative voltage supply from +DC Voltage supply
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leongch



Joined: 22 Dec 2005
Posts: 40
Post22 Mar 2006 20:04   

negative voltage supply
hi, i only got DC adapter and 78L12 and 78L05 ... how could i get a -12V and -5V from the components above? Any other circuit recommended which provide -12V and -5V from positive DC voltage source? I need it in urgent... Project due soon


Thanks a lots
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Post22 Mar 2006 20:04   

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slavko



Joined: 01 Sep 2004
Posts: 134
Helped: 14
Post22 Mar 2006 20:55   

how to get negative voltage
Check these sites maybe you will find what you looking for:
http://www.hobbyprojects.com/quick_circuits_reference/power_supplies_and_control_schematics.html

http://www.electronicsteacher.com/circuits-and-diagrams/power-supplies-and-control-schematics
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seadolphine2000



Joined: 12 Apr 2005
Posts: 621
Helped: 39
Post24 Mar 2006 13:59   

negative dc voltage
Do you mean that you need both +,- 12V and +,- 5V at the same time.???
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Davood Amerion



Joined: 01 Mar 2005
Posts: 589
Helped: 90
Location: Persia
Post24 Mar 2006 14:24   

negative voltage from positive supply
look at my post in this link:
http://www.edaboard.com/viewtopic.php?t=159816&highlight=

Regards,
Davood.
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