Electronics > Projects, Designs, and Technical Stuff
Hobbyist Voltage Reference
rpetitho:
Currently working on a voltage reference to calibrate multimeters and stuff. I am going to use the MAX6350 powered by a 12 volt battery. I choose this reference because it has good accuracy, and I have not got the equipment to calibrate it. I put a spot on a board to trim it if I want to later.
The circuit has 2 sides. First is the reference side, taken from the data sheet. Second is the LED light to let you know everything is awesome. It will be green when on, but will turn yellow as the voltage approaches the minimum for the 6350. Plan is to fit it into a small aluminum enclosure with banana jack outputs. I post updates when I get them! If you see anything crazy please let me know.
-Bob
RandallMcRee:
Your output capacitor should be hung off the MAX6350's NR pin--that is what its there for. As suggested in the datasheet:
rpetitho:
Sounds good. I stick one on when I build it up, maybe I'll do a test to see how much of a difference it makes.
teksturi:
Datasheet says that 1uF capacitor for NC pin. In figure 3 there is also output capacitor so you can just add NC capacitor and not move it from output pin.
Layout looks good to me. Couple small thinks.
Do you need mounting holes now they are missign?
You should use thermal relief pads so it will be easier to solder.
Maybe move your wirepads that way that if you want to you can add connectors.
You do not have very much room sides of your board. Maybe add couple mm to your board size an less you have case for this already.
Edit: And you can add decoupling capacitor for LM358. Datasheet says 10nF. And also add some hysteresis to yellow led driver.
MosherIV:
Hi
Have you thought about using the AD584?
It gives you 3 reference voltages: 2.5V 5V and 10V
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