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  1. E

    problems with my power supply.

    thx Gil, i used a diode on the regulator , any way it finally worked , although it seems somehow unstable (sometimes the voltage of the 7812 change to about 0.78v but it return back with a small shake) it may be just soldering problem, the problem is that,i can't get until now what made it...
  2. E

    problems with my power supply.

    i hope that i will really learn from that.
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    problems with my power supply.

    it seems that this project is cursed!! i put the diodes and the project test was good on the breadboard and i was sure that the regulators r working well , then after i soldered the components on the PCB, the 7905 ,7912 was ruined the 7905 gives about 10v , 7912 now doesn't regulate at all ...
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    problems with my power supply.

    thx , Gil , i will see what i can do.
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    Have no electronic experience but sure this is simple?

    it will be simple with out the pc thing , because it will need a microcontroller to communicate with the pc , a pic microcontroller will do it good , and u can go to microchip company site and go to application notes to find about it, if u r not ready for microcontrollers, i think u will need...
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    problems with my power supply.

    the 7912 pin config is GND-IN-OUT , right? i connect it like that , i suspecting it may be a potential latch up , u know any thing about that Gil?
  7. E

    problems with my power supply.

    i think my wiring is right , and by the way the cct i gave here was a testing cct for the components , any way , the problem is that the volt drops on 7912 input and o/p and it becomes over heated which means that there is high current, that happens when i add the regulators , or just one of...
  8. E

    problems with my power supply.

    i am working on split power supply (5,12,-5,-12v) , that i am going to use for general purposes i used : 12-0-12 about 1A transformer 2A bridge 7805 7912 2x2200u 16v for testing the circuit before soldering i had about 12v on the 7805 o/p and about 0.78v on the 7912 also...
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