[HELP! project abt DC power supply.]

Hi everyone!Base on what the teacher had teached,the 78series is for positive volt.For example 7815 is positive 15 volt.Therefore,79 series is for negative volt.For example 7905 is negative 5 volt.So you have to change the voltage regulator.Then i thinking that the Zener diode can be remove since it is to prevent getting inverse voltage.Er...anybody has a better idea?

[HELP! project abt DC power supply.]

Thanks ante!hi everyone,i also from tp.I believe everyone is busily doing your EPT project.When you serch internet,there is no clue on the triple output supply and it goes the same for books.Any suggestion must post wor..

[HELP! project abt DC power supply.]

Hi ante,the electronics god!Just want to add on to the question.Do you mean adding 7905 beside the 7915?Then do i need to add space for the negative 5 output?Sorry for the trouble because i very new and blur to electronic stuff. Thanks ;D