Why does L7905cv have an output voltage of -10V instead of 5 when inputting -12V ?

QYape.1 · ‎2021-08-03

I' m sure GND has been connected.

s_ · ‎2021-08-04

Have you fitted the necessary capacitors (IN to GND and OUT to GND)? Also note that the negative regulators (79xx) have a different pinout from the positive ones (78xx). See datasheet for details.

Peter BENSCH · ‎2021-08-04

Welcome, @QYape.1, to the community!

Did you set up your circuit according to Fig. 4 of the datasheet of the L7905CV?

Are the capacitors present and located close to the L7905?

Regards

/Peter

In order to give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.