# Counting The Number of Clock Pulses in the Period of the Waveform

Discussion in 'Homework Help' started by VEDELAGO!!, May 9, 2007.

1. ### VEDELAGO!! Thread Starter New Member

May 8, 2007
6
0
Hello Everyone,

For my homework, i have been given the task of designing a circuit which counts the number of clock pulses in the period of waveform A (attached image).

I have done a couple of hours of research and have come across something called a frequency counter.

Will using a frequency counter (which i believe involves the use of J-K Flip-flops) actually count the number of clock pulses in the period of waveform A?

- VEDELAGO!!

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2. ### beenthere Retired Moderator

Apr 20, 2004
15,815
283
Freq counters use an accurate time base to count the input pulses for a period of time. The period is fixed, so the frequency scales directrly to frequency. With a front end conditioning the pulses to a compatible logic level, any logic family counter chip may be used - not just J-K FF's.

3. ### VEDELAGO!! Thread Starter New Member

May 8, 2007
6
0

I'm just not sure on the part where you say
Do you mean that frequency counters need to use the original clock pulse to count the input pulses?

If you could elaborate a little it would be much appreciated

Thanks.

- VEDELAGO!!

4. ### recca02 Senior Member

Apr 2, 2007
1,211
0
one idea that i get is:
i think u can use the clk pulse to drive a counter.
if u want a pulses per second display may be use of a timer ckt (monostable or bistable)
which disables the clk i/p after one sec might work.

5. ### beenthere Retired Moderator

Apr 20, 2004
15,815
283
Imagine a counter that is enabled to count pulses for a period of one second. The accumulated count would be the number of pulses in one second, which, times 60, is the pulses per minute, or the frequency.

6. ### VEDELAGO!! Thread Starter New Member

May 8, 2007
6
0
Thanks for the help recca02 and beenthere.

I think i have a solution thanks guys!

- VEDELAGO!