Newbie questions

[Neil]

Hello friends,

Trying to build the zed pro as a standalone device with its own power supply, monitor and keyboard. I have a 5 volt Raspberry pi charger which i plan to use but am stuck on power issues. Please look at the photo where I've highlighted the things i'm not understanding: 

1. LM7805 has three pins. Is it right for me to leave these empty for my setup? 

2. 5v Direct - I've seen some YouTube videos where some people put a jumper on this, but again i'm not sure if i need to do anything with this or not for my intended standalone setup. Google Gemini gives me conflicting answers.

3. Are for polarised 'tin can' capacitors, but none came with the kit. Can i just leave these empty for my setup?

4. I'm not intending to power the machine with a barrel jack - so can i simply not solder this part on? 

5. Is for the switch. In my last build which went wrong, although i soldered the switch in place it never seemed to have any effect! 

6. Auxillary 5v output - Finally, for my standalone setup do i need to be concerned about this or can it just be left empty?

Thank you very much for your time.

Best wishes

Neil

[Ed Silky]

What amperage/wattage is your RPi supply? How do you plan to connect the supply to the board (or is that your question)?

-Ed

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[Spencer]

Hi Neil,

1. If you're feeding it with 5v then you can leave the LM7805 footprint empty
2. I wouldn't trust any answer from Gemini myself. However, in this instance, yes, you need a jumper across the 5v Direct pins.
3. The electrolytic (tin can) caps are only needed if you are using an LM7805 regulator. As you are not fitting one of those, you can leave those empty.
4. Yes, you can leave the barrel jack off of the board
5. The switch only switches the power from the barrel jack. So if you are not feeding it power from there then it won't do anything. (feel free to leave it unpopulated)
6. Yes, you can leave this terminal off of the board too.

Hope that helps

Spencer

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[Neil Sutton]

Hi, thanks for your reply. I know how to connect the power supply red and black wires to the gnd plug. Just confused about the rest.

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[Phil G]

Raspberry Pi PSU's are beefy, even the smallest of the 12.5W, 15W, 27W or 45W range has plenty of power for a full RC2014 Zed Pro.

[Martin Giese]

Stranded wire in a screw terminal won’t be very durable. And little bits of copper wire coming loose and causing short circuits can spoil your day!  

So once things are up and running, you might want to either a) get that barrel jack and solder a connector onto your power supply wires, or b) crimp some bootlace ferrules (google them) onto your wire ends.

Ferrules are sturdy and cheap and they can be crimped with pliers if you don’t want to buy a crimping tool. But you need to find the right size for your wires so you probably end up getting several sizes to find the ones that are just right.

Martin

[Dave White]

Just bought this set, delivered earlier in the week, for $13. On sale starting June 1st for 8$

Crimper Plier HSC8 6-4 0.25-10mm ² 23-7AWG For Ferrule Tubular Terminals Ferrule Crimping Clamp Set Wire Head Electrician Tool - AliExpress 1420

[Ed Silky]

I have that set. It works well.

-Ed

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[Neil]

Hi Friends,

Thank you all for your help and for replying so quickly. I was so pleased to see that green bulb light up when i powered up the backplane for the first time! It was a relief to have built what appears to be the trickiest part!!

I have noted the comments about how to make the power supply more stable and intend to follow the directions in due course. In the meantime, i'm going to make a start on building the modules next.

Thanks again & best wishes all

Neil