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Meters Circuits / Meter Counter Circuits

This tachometer lets you measure heartbeats, respiratory rates, and other low-frequency events that recur at intervals of 0.33 to 40.96 seconds. The circuit senses the period offm, computes the equivalent pulses per minute, and updates the LCD accordingly. Although the decimal readout equals 60 fm, the circuit doesn`t actually produce a frequency of 60 fm.
Low-frequency-tachometer - schematic

The computation involves counting and comparison techniques and takes 0. 33 seconds.


4026 manual digital counter circuit with reset

RPM / Rev Counter- Frequency Meter with wiring and code + Hall Effect