A Low RPM Alarm Using 74HC or 4000 Series Logic. No MCU allowed.
- Status: Closed
- Prize: $100
- Entries Received: 13
- Winner: osamaelkomy
I need a simple circuit using common hardware parts that measures the high width of a TTL pulse and if it exceeds 3 seconds a logic output is set high as an alarm.
If the pulse becomes shorter than 3 seconds the logic output is set low so alarm is turned off.
A 32768Hz clock is available. Maybe a 74HC series binary counter might work. Or specify your own clock generator.
We want simple 74HC logic, or 4000 logic. Not MCU and not FPGA.
When we choose the circuit we will build it to confirm it works before awarding prize.
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