Re: How to count pulses per second ?

On 13 Feb 2007 14:04:42 -0800, "Mike C" <tiberian5@xxxxxxxxx> wrote:

Hi, I'm hoping someone could help me create a very basic circuit which
would:

Count the number of pulses it receives per second (from a 555 timer,
or a switch, for example) and if the number of pulses per second is
equal to, or greater than 10 it turns on a transistor.

So basically it should check every second if a clock frequency of 10Hz
is being met - if so, a transistor should turn an LED on and keep it
on for as long as 10Hz a second is hitting the circuit. As soon as the
clock stops, or the frequency goes below 10Hz, it should turn off the
LED.

---
That can be very easily done with a single retriggerable one-shot
with a 100 millisecond timeout. What's your application and what
kind of accuracy do you need?


--
JF
.

Relevant Pages

  • Re: How to count pulses per second ?
    ... Count the number of pulses it receives per second (from a 555 timer, ... or a switch, for example) and if the number of pulses per second is ... or greater than 10 it turns on a transistor. ... So basically it should check every second if a clock frequency of 10Hz ...
    (sci.electronics.basics)
  • Re: How to count pulses per second ?
    ... Count the number of pulses it receives per second (from a 555 timer, ... or a switch, for example) and if the number of pulses per second is ... or greater than 10 it turns on a transistor. ... So basically it should check every second if a clock frequency of 10Hz ...
    (sci.electronics.design)
  • Re: How to count pulses per second ?
    ... or a switch, for example) and if the number of pulses per second is ... or greater than 10 it turns on a transistor. ... The idea above was that the pulses the OP is counting are going into ... Retriggering shouldn't ...
    (sci.electronics.basics)
  • Re: How to count pulses per second ?
    ... Count the number of pulses it receives per second (from a 555 timer, ... or a switch, for example) and if the number of pulses per second is ... or greater than 10 it turns on a transistor. ... So basically it should check every second if a clock frequency of 10Hz ...
    (sci.electronics.basics)
  • Re: How to count pulses per second ?
    ... Count the number of pulses it receives per second (from a 555 timer, ... or a switch, for example) and if the number of pulses per second is ... or greater than 10 it turns on a transistor. ... So basically it should check every second if a clock frequency of 10Hz ...
    (sci.electronics.basics)
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