Jump to content
Electronics-Lab.com Community

power supply -5 V

Recommended Posts

why I use IC 7905 with 1 gnd 2 input and 3 output not afford -5 V but when I saw in multimeter one with other multimeter have report -2,... V not -5 V. And i ever buy 7905 other but consistent with the report is same. Why ??? please help me and thanks very much :)

Link to comment
Share on other sites


you must be sure of your input voltage, your connections should be correct from the first time, i mean if you reversed 2 and 3 and then discoverd your mistake, the ic may be burnt out and you will use it defected in the next time.
note that the input max voltage is -7 and input min voltage is -25

try again ;)

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...