How to get negative voltage supply from +DC Voltage supply

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leongch

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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
 

negative dc voltage

Do you mean that you need both +,- 12V and +,- 5V at the same time.???
 

negative voltage from positive supply

look at my post in this link:


Regards,
Davood.
 

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