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where do I enter the coupon code at?

Edit: I found it on the paypal step 2/3 page

Thanks!
 
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Hello, I'm a newcomer here. Can you please tell me what the difference between linear driver, and linear driver kit is? one is cheaper than the other, but they both have the same picture.
thanks!
 
Hello, I'm a newcomer here. Can you please tell me what the difference between linear driver, and linear driver kit is? one is cheaper than the other, but they both have the same picture.
thanks!
Logically speaking the kit are all components and circuit board: you have to solder them yourself.
The driver (more expensive product than the kit) comes presoldered and tuned to your output
 


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