PROJECT – PANEL METER – Build Log
This is a small Panel Meter project that I had created. This circuit was designed for use in my BOGUS BURDEN 4000 project but can be used in anything really.
This is just one way to do this, and it’s pretty much as the datasheet explains. Let’s get started.
My circuit consists of a PCB backpack to this meter that allows for the appropriate scaling resistors as well provides a method to switch between two different measurement ranges. Also provided is a voltage regulator circuit (this is optional). It all works well enough… it’s a little buggy, but I’m sure with some tweeting, finesse and gentle massage, it should run fine as a Chevy.
INs AND OUTs:
P7 – is the DC voltage input, there is provision for an LM7805 here, but this regulator can be bypassed if your circuit has +5V DC available already.
SW1 – This is where you would attach your range section switch. This controls a relay which will switch in the appropriate range resistors for the display range you would like.
PIN 11-13 – these are inputs for various decimal places. If you would like a decimal to be displayed, tie the desired pin high.
P6, P5 – Attach your circuit to be measured here P6+ P5-
VR1, VR2 – these pots are tweakers for the two different measurement ranges. Again, this kinda works, it’s hard to get it completely accurate, but it’s close enough for me.
All resistance values depend on your individual range needs. The data sheet has a nice chart to help you decide what values to use. I have duplicated this chart in my schematic.
I think that is about it, I find this a simple to add a panel meter on the cheap to any project you might be thinking of.
Again, I welcome comments and suggestions… constructive criticism, etc. Please share this project if you find it noteworthy.