sd card/gps conflict?

Other Hardware Storage
1

Hi,
I'm using a mega 2560, a gps module and a cheap sd card module (using spi) to try and log gps data.

Individually, the gps and sd work fine. When I power the sd card with a separate linear regulator, and the gps via the 3.3v pin, they work together. However, when I try to power them both by a separate literary reg, the sd reader won't initialize. I'm not sure if this is a programming problem (unlikely?) Or just that my electronics knowledge isn't up to scratch. Anyone have any ideas?

Thanks

2

This is the general schematic. Its badly done, but can anyone see a major problem? Many thanks. XD

proj1.png
proj1.png1143×813 10.6 KB

3

However, when I try to power them both by a separate literary reg,

With a what?

What kind of linear regulator are you using? Is it capable of supplying the current needed by the GPS and the SD card?

4

Sorry, that was my phone's auto correct!

I'm using a ld1117av33, capable of 1A.