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Floppy disk, flux capture, Analog front end - Coggle Diagram
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flux capture
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Measures: the time between transitions (intervals), by counting clock cycles between pulses
giving a stream like: [3.9 µs, 4.0 µs, 8.1 µs, 4.0 µs, 12.2 µs, ...]
FM/MFM Decoding
Bitstream reconstruction: fill in 0s for missing flux transitions, and add 1s where a flux matches a valid MFM encoding
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Analog front end
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AC Coupling Stage:
Purpose is to remove DC offset (bias voltage) and pass only flux change events (high-pass behavior), using a series capacitor between read head and amp input
(value depends on desired cutoff frequency).
Preamplifier stage: Purpose is to Amplify tiny analog signals (millivolt level) to usable levels (1–2V peak), with an op-amp
Bandpass filter stage: eliminate noise and clean up the signal to ensure only valid pulses pass through.Can use an RC filter, or an active bandpass filter
Comparator stage: convert analog signals into a digital pulse every time a flux transition occurs, with logic level (5V or 3.3V) suitable for MCU input.
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