[Moved] Need solution for power supply issue

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Murugesh_89

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Hi,
I am using a single smps power source and give the power supply to the boards as shown below.



In each board i am using a 7805 for 5v regulation. After each board the supply voltage reduces and eventually after 6 boards the voltage becomes 9V.
can you please help me to get out off this issue?

Thanks in advance.

Regards,
Murugesh
 

The diagram does not reveal how the boards are connected to each other. If they are directly connected so that each board receives input directly from the SMPS, the reason for the drop could be resistance in the PCB tracks. If so, you would need to make them wider. Ensure that there aren't any components in the way, like diodes or transistor switches. If there are any, please show their connections.
 

Hi tahmid,
Thanks for your reply..

Ya as you said it could be the issue with the track width also. Here i attached a new figure which can make you understand how i connected exactly.


waitinh for your reply..

Regards,
Murugesh
 

Have you tried measuring the resistance of the path through all the boards? Several connectors and PCB traces can add up to be significant, especially at high current levels.
 

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