
This lesson focuses on the problem of switch bounce and how to correct it using capacitors and Schmitt inverters. Students explore why mechanical switches can create false counts in digital systems and how signal conditioning ensures accuracy.
Key learning:
Understand switch bounce and its effects on counters and displays
Use capacitors to suppress bounce, and Schmitt inverters to eliminate it
Build and analyse circuits for debounced switch inputs
Apply debouncing to practical contexts (e.g. counting systems, sensor triggers)
Includes:
Practical circuit diagrams with explanations
Investigation tasks (light sensors, counting systems)
Exercises designing and testing debounce circuits
Keywords
GCSE Electronics, WJEC Eduqas, switch bounce, debouncing, Schmitt inverter, counters, sensors, input interfacing
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