AQA A-level Physics Electronics lesson on astables and binary, BCD and Johnson counters. 20 editable slides, 25-mark worksheet, mark scheme and PDFs.
What’s in the PowerPoint
• A capacitor recap starter, with answers in the speaker notes
• The astable as a clock, with capacitor and output waveforms
• Period, frequency, duty cycle and mark-to-space ratio, and tP ≈ 1.4RC
• Counter inputs and outputs, and a binary counter timing diagram
• Binary, BCD and Johnson counters, and modulo-n counters
• A digital watch worked example and a practical
• A common mistakes slide based on AQA examiner reports
• Six check questions with answers, and an exit ticket
• Teacher notes on every slide: spec references, examiner report tips, prior knowledge pages and practical ideas
What’s in the worksheet (25 marks)
• Recall of pulse terms and counter types
• Oscilloscope trace, astable frequency and parallel resistor calculations
• Drawing a timing diagram and designing a modulo-5 counter
• A full mark scheme with mark points, on separate pages
• PDF copies of the slides, the student worksheet (no answers) and the mark scheme, ready to print
Good for: first teaching, revision, homework, cover lessons or independent study. The PowerPoint and Word files are fully editable, and the PDFs are ready to print or share with students.
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£3.00