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Practice
The same twenty challenges, filtered by difficulty and topic. Weekly standings live under Compete.
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1 · Beginner
One series loop sets the LED current. The anode faces the source.
Schematic Reasoning · Datasheets & Components
2 · Beginner
The device card names each pin. The pin beside it has a different name.
Datasheets & Components · Schematic Reasoning
3 · Beginner
A ratsnest is a guide. Copper is the connection.
PCB Fundamentals · Routing
4 · Beginner
The 100 nF capacitor closes a short loop at the pin. The 10 µF capacitor refills it.
Power · PCB Fundamentals
5 · Beginner
Each supply pin gets its own nearby capacitor, on the same supply and the same ground.
Datasheets & Components · Schematic Reasoning · Power
6 · Intermediate
Width follows the stated limit
Routing · PCB Fundamentals
7 · Intermediate
Return current under the trace
Grounding / Return Paths · Routing
8 · Intermediate
A regulator is a three-terminal circuit
Power · Schematic Reasoning · Datasheets & Components
9 · Intermediate
Series and shunt protection
10 · Intermediate
The hot loop of a buck
Power · Routing · PCB Fundamentals
11 · Intermediate
A stackup gives current a home
PCB Fundamentals · Grounding / Return Paths
12 · Intermediate
Two traces that travel together
High-Speed Fundamentals · Routing
13 · Intermediate
USB-C is not one pair of pads
High-Speed Fundamentals · Datasheets & Components · Schematic Reasoning
14 · Intermediate
Gain, filtering, and a short feedback loop
Analog · Schematic Reasoning
15 · Intermediate–advanced
A converter has two worlds
Mixed Signal · Analog · Grounding / Return Paths
16 · Advanced
A fast trace needs a neighbor and a reference
High-Speed Fundamentals · Routing · Grounding / Return Paths
17 · Advanced
Current, heat, and copper area
Power · Routing
18 · Advanced
The board still has to be built
DFM / Manufacturing · PCB Fundamentals
19 · Advanced
Evidence before a fix
Debugging · Power · Mixed Signal
20 · Advanced
One board, several disciplines
Power · Analog · Mixed Signal · High-Speed Fundamentals · DFM / Manufacturing · Schematic Reasoning