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  • TC7136/TC9400 Digital Readout Frequency Meter
    Two low-cost integrated circuits can be combined to create a simple digital frequency meter. The combination of a frequency-to-voltage converter (FVC) and a dual-slope, analog-to-digital display converter (ADC) makes a small 2-chip frequency meter that can be run from one 9-volt battery.
  • Environmental Noise Control Trends in Instrumentation
    out by a Sound Level Meter - or "SLM". Sound Level Meter technology has evolved quite a bit over the years. In the days before digital technology was common-place, sound level meters were based on analog circuitry. A microphone produces a signal that is rectified. The rectified signal is filtered

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