I new to electronic engineering and am trying to learn electronic engineering by creating little projects. I have a few questions about powering my Raspberry Pi (5 V DC @1000 mA) from a 12 V DC 1000 mA power supply. The 12 V power supply will provide power to the TFT monitor, and I want to also power my Raspberry Pi from the same source.
After doing some research, I can make a 5 V regulator using a 7805 voltage regulator and two 100 µf electrolytic capacitors. The plan is to put a heat sink on the 7805 to help dissipate the heat. My goal is to have one source of power input for my project.
My schematic:
And a Fritzing diagram on the hook up:
- Is this the correct approach?
- Is my schematic correct?
- Is my hookup correct?
Best Answer
Knowing that many people have issues with a 5V/1A power supply, it being on the weak side, I expect RPi to draw a fair amount of current, quite near to the maximum current rating of the regulator. In theory your circuit is largely correct, but you will need a huge heat sink dissipate somewhere near 7W (more than half the total power used). A good heat sink is probably more expensive than a capable switching converter. I'd check Internet for a cheap buck or DC/DC converter.