| Difficulty | Secondary School | High school/other |
| ★ | Basic | Easy |
| ★★ | Demanding | Basic |
| ★★★ | Demanding | |
| ★★★★ | Difficult | |
| ★★★★★ | Very difficult |
Determine the threshold voltage of the diode and the resistance of the front resistor.
Answer: $0{,}75\ V$ ; $33\ \Omega$
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