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Testing 7805...7905 regulators

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nkn

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i want to test voltregulators like 7805.../7905... from psu whitout centar +27v
please help me.thanksΩ
 
I do not understand.

Is this true?
You want to test LM7805 and LM7905 from a bench power supply that has a output of 0V and +27V but no -27V.

Testing LM78XX is easy you know how using +27V. I would use a socked to plug the LM78xx into. Put a capacitor from input to ground and a capacitor from output to ground. Use a meter to read the output voltage. Maybe you want a small load.

To test LM79XX do the same as above. The pin out is different. Connect the ground of the bench power supply to "input voltage" on LM79xx. Connect +27V from the bench supply to "ground" of the LM79xx.
 
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