How do solar junction boxes work?

With solar systems, you often see a junction box that apparently is necessary equipment for a solar installation. What is it? It has diodes inside, right? Why do you need it?

Question by Udon 8 years ago  |  last reply 8 years ago


How would this schematic look on a circuit board?

I currently have this schematic for solar powering my Arduino board. I got this schematic directly off the instructable: https://www.instructables.com/id/Self-Sufficient-Arduino-Board/   I am a newbie to this kind of stuff and understand how circuit boards work but have spent hours trying to figure out how to correctly draw it like it was on a circuit board. I made a final attempt and drew it on a PCB circuit board template shown below. The components used are annotate with their polarity (the switch isn't cause it can go either way) and the red lines indicate the soldered connection. If someone could just check it out and make sure all the parts are right, it would be greatly appreciated. The main problem I have with it is the junction where the battery positive, switch and Arduino positive all meet. All help is greatly appreciated Thank you, Connor

Question by cobrien2115 4 years ago  |  last reply 4 years ago


Outdoor listening installations

Would appreciate some advice on this project.  I'm putting together a proposal for a series of outdoor sound installations in a nature park.  a couple of the installations will be places where you can plug in headphones to listen to certain sounds captured live from a microphone in an interesting place- for example a hydrophone in a pond.  The plan is that the mic will be hooked up to 3.5 jack sockets and listerners will be able to plug in their own headphones.  Now obviously there needs to be some amplification because the mic signal level will be far too quiet to hear on headphones. I need a power amp that will be powered through a solar panel.  My question is, shall I just use a headphone amp, like the Behringer ha400 or make my own power amp circuit? I need to be able to make everything sturdy and fit into a weather proof junction box to protect it from the elements. I have done some experiments with an LM386 power amp module but there was so much background noise and it didn't pick up the mic level at all (may have been a problem with the mic I was using,it was a crappy little lapel mic.- I did get a signal from a piezo disc but it was again really crackly and noisy.)  If it is best to build a circuit with a power amp module, could people make suggestions of ones that will sound good and clean, and work with stereo headphones.  Thanks a lot Ash

Topic by AshtonM4 3 years ago  |  last reply 3 years ago