Forum / Electronics & Board Repair
✅ Reading a schematic for the first time: what do the numbers next to capacitors mean?
@spokes_n_sprockets
Oct 5, 2026 · 1.2k views
Trying to follow a Rossmann video and he keeps saying "the 3.3 volt rail". How do I find that on the schematic and what does 10uF 6.3V mean exactly?
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1 replies
✅ Accepted solution
10uF is the capacitance, 6.3V is the maximum voltage it is rated for (so on a 3.3V rail you have headroom). Rails are labelled as net names like PP3V3_S0 on Apple boards; search the PDF for the name and you find every part connected to it. The Learn Electronics Repair channel has a "how to read schematics" series that walks this exact thing.
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