smps for car audio with TL494

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hello dear friends
i creat my pcb and smps but it dose not work
when i conect batrry wire the red led is tern on.
i want to creat my own car amplifier but can not to creat smps for that.
i see in diy site you do that in past.
can you please help me to creat a good smps?
sory for my bad english
very thanks for your helping.
have a nise day dear friend.
 
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This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.