All You Need To Know

I'm working through The ALL YOU NEED TO KNOW series. These are my notes.

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All You Need To Know About RESISTORS To Fix Stuff!

• 1R0 = 1.0 Ohm
• 1K0 = 1.0 K Ohm
• 1M0 = 1.0 M Ohm

Three digit code: value value multiplier
Four digit code: value value value multiplier

The reason for connecting a bunch of lower value resistors in series is to provide an aggregate resistance which can handle a higher current.

With SMD components:

• if they look black they are almost certainly resistors (but could be capacitors)
• if they look brown they are almost certainly capacitors (probably not resistors)
• if they look white they are usually capacitors
• if they look green they are usually resistors

All You Need To Know About CAPACITORS To Fix Stuff!

Be careful with capacitors! Use a resistor to discharge them before working on them.

Three ratings:

1. capacitance (Farads)
2. voltage (volts, this is a limit)
3. effective series resistance (ESR) (Ohms)

1,000 pF = 1 nF
1,000 nF = 1 μF

Three main uses for capacitors:

1. filtering (coupling)
2. smoothing (decoupling)
3. timing

• capacitors in parallel: double (100 + 100 = 200)
• capacitors in series: half (100 + 100 = 50)

Ripple current can cause a capacitor to fail, it can literally boil the electrolyte.