Principle on how to measure Frequency - Update

255

03:36:55

Here is a little circuit to measure low frequency ...
You got two switch :
- the left one to reset counters,
- the right one to start counting during one second. So you can measure the frequency.
You may change the frequency with the potentiometer of second 555. 

I change the second oscillator to get a better duty cycle. 
It works from 15Hz to 67Hz changing the potentiometer from 10% to 90%

published 11 years ago

add comment in editor

EveryCircuit is an easy to use, highly interactive circuit simulator and schematic capture tool. Real-time circuit simulation, interactivity, and dynamic visualization make it a must have application for professionals and academia. EveryCircuit user community has collaboratively created the largest searchable library of circuit designs. EveryCircuit app runs online in popular browsers and on mobile phones and tablets, enabling you to capture design ideas and learn electronics on the go.