Ciro Santilli's hardware / Electronic components

Elegoo Breadboard power supply module MB‐V2:
- Input voltage: 6.5-9v (DC) via 5.5mm x 2.1mm plug
- Output voltage: 3.3V/5v
- Maximum output current: 700 mA
TODO center positive or center negative?
Does not come with AC adapter, getting this one: www.amazon.co.uk/dp/B08ZN476FW output: DC 9V 1A Power Supply Adapter, Plug 5.5mm x 2.1mm, Center Positive,B rand: Security-01, input: AC 100-240V 50/60 Hz, Cable length: 1.8m
Parts list from the ZIP:
resistors:
- 10x each:
  - 10
  - 100
  - 330
  - 2k
  - 5.1k
  - 10k
  - 100k
  - 1M
- 30x 220
1n4007 General Purpose Rectifier
22pf 104 Ceramic Capacitor
4N35 optocoupler
74HC595 8-bit serial-in, serial or parallel-out shift register with output latches; 3-state
Active buzzer
Buttons
CDS-55 Photoresistor
Electrolytic Capacitor
MF52D 103f 3950 thermistor
PN2222 General Purpose Transistor
Passive buzzer
3386p Bourns Precision Potentiometer - 1 103T: 10 Ohms to 2 mega Ohms. TODO part broken? Multimeter measures fixed 10 kOhms no matter where I set it
LEDs:
- White LED 10x
- Kingbright RGB LEDs 10x red, green, yellow, blue:
  maximum Continuous Forward Current: 30 mA for read and blue, 25 mA for green
  303025
  under 20 mA
  Forward Voltage: 2.0 V typical, 2.5 V max
  20 mA appears to be the typical operation. So with the 2.0 V drop on 5 V power we want a resistor such that:
  $(5 - 2) / r = 20 \times 1 0^{- 3} ⟹ r = 150Ω$
  (1)
  for the max 50 mA we would instead have 60 Ohms

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