External Power supply for 5 SG 90 Servos

I am working on a robotic arm project which uses 5 SG 90 micro servos. After researching I found that 5 servos require an external power supply, and I should allocate 1A for each servo. I intended on using batteries but decided on a 5V 5A AC adapter power supply for convenience.

I had planned on wiring my circuit similar to the one pictured below. I intended on using a breadboard compatible barrel jack to match the power supply. The barrel jack would go into the power rail of the breadboard. The servo power and grounds would go into the power rail like in the image below. However, I later found out that the breadboard pins cannot handle current greater than 1A. I was wondering if this setup would instead be feasible with the solderable breadboards like the one below. I wasn't able to find much information about the maximum current for the solderable breadboards.

Thanks for your help.

Screen Shot 2021-08-26 at 3.46.02 PM|561x500

Solder able breadboards should work fine. I think the limit is 3 amp for 1 mm wide and 6 micron thick copper.
You can strengthened the breadboard by adding solder on the rails or adding an additional copper wire.
You're on the right track.

Thanks for the reply. Do you mean adding solder on the rails as in like with this photo where the individual pads are bridged with solder lines? How does this increase the current carrying capacity. Sorry, I'm new to this.


Solder or extra wire, like @Railroader sez.

Basically, thicker wire can carry more current.

Wider traces on a printed circuit board PCB can carry more current.


  awg current rating

in your spare time.


Yes. Doing like in the foto is one way to increase the current capacity.
Note that You only need to do it for the lines carrying that higher current.
It's a risky way to go. It's very easy to get an unwanted connection with a neighbour line. The You need a tin suction tool to recover.

Batteries are never convenient if the mains is available! Battery voltage varies and you have to charge them.

The breadboard ICs in your first post have the "bus" strips and columns already connected, so you can avoid the solder bridging problems. The form factor of the UNO is a nuisance, a Nano is much easier to use.

Thanks for the replies. The barrel jack I will be using is breadboard compatible however I believe it won't fit nicely into the power rails of the breadboard and I will have to connect it like in the photo below, with the wires found in the common breadboard wire set. Will these wires be able to safely carry my power supply voltage and current to the power rails, considering how short the wire distance is?

Do you mean I don't have to apply the solder trace to the power and ground bus rails and the circuit will hold up fine without current issues?

And yes, I will be using the nano because I can solder it between the middle of the breadboard.

This topic was automatically closed 120 days after the last reply. New replies are no longer allowed.