Hey everyone,
I’ve been tinkering with a few low-voltage circuits lately and wanted to add a compact voltage display just to keep track of supply levels on my bench builds. I’m looking at one of those mini DC digital voltmeter heads — the ones with a 0.28-inch LED display and simple two-wire connection — and I’m curious how reliable they are for hobby-grade use.
From what I’ve seen, they auto-adjust precision (down to 0.01 V under 10 V) and work nicely between 3.5 V – 30 V, which seems perfect for breadboard projects or portable battery packs. But I wonder how they hold up in practice — do they stay accurate over time, or drift with heat and load changes?
Also, do most of you prefer the three-wire versions (for separate measurement input) over the two-wire types that share the power line? I’m debating which one to embed into a small test rig I’m building for battery monitoring and sensor prototyping.
Would love to hear what kind of mini voltage displays you’ve found most reliable for hobby setups!
Szia
If you only need it for a 24 volt battery, then the two-wire one is enough. If you need it for a battery greater than 30 volts, then the 3-wire one is needed. You can adjust the accuracy either with a potentiometer or a fixed resistor. By the way, no matter how many voltmeters I use, they all show different things.
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Hi!
These displays are the worst quality. They are neither accurate nor durable. The brightness of the green is also too low.
You can expect a slightly better result for this kind of money.
https://www.ebay.com/itm/356276870628
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