## Wednesday, April 12, 2017

### Simple Circuit Schematic Frequency Meter

Eltronicschool. - This is of the instrumentation circuit schematic that called with frequency mater. The main component that used in this circuit are integrated circuit multivibrator dan D Flip-flop.

In this time, based onD Flip-Flop, we will give you one of electronic circuit schematic of simple frequency meter like in Figure 1. below.

Circuit Schematic

Component Part
1. Integrated Circuit
2. Resistors
3. LED
4. Capacitors
5. Variable Resistor
Description

Circuit schematic like in Figure 1 above is simple frequency meter. According Electronicsproject site describe that this is a simple frequency meter with which input frequency can be determined by simply measuring the values of two resistors and a little bit of computation.

A retriggerable monistable multivibrator and a D flip-flop can form a simple, yet reliable frequency comparator that compares an input frequency with a predetermined reference. To determine whether an input frequency (f) falls between two known frequencies, f1 and f2, two one-shot/flip-flip combinations are used, as shown.

Here both the one-shot and the flip-flop ICs are wired for positive-edge triggering. Each input pulse causes the monostable’s output to go high for the period of its preset timing interval. The flip-flop is triggered simultaneously, but its output is determined by the state of its D input at the time of trigger threshold.

If the period of the input frequency is shorter than the preset timing of the monostable, a constant high level will be present at the D input, forcing the flip-flop’s Q output to remain high. If the input frequency period becomes greater than that of the monostable, the flip-flop’s Q output will go low.

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