Implementing a frequency meter in the pulse generator

Thread Starter

nenadilic84

Joined Aug 7, 2009
62
Hi to all, I have built I pulse generator with the basic 555 IC. The Pulsing signal is 15 Volts. Now I want to measure the frequency of the signal. I found cheap and easy to build frequency meter but I'm not sure how to connect out of my pulse generator to frequency meter.
Here is the circuit of frequency meter that I want to build


Thanks,
Nenad
 

beenthere

Joined Apr 20, 2004
15,808
That will be a challenge if the output of your 555 is not a logic level output. The circuit will only accept a logic level input, which is 0 or +5 volts.

You might want to add a buffer at the input to this counter. Something like a Schmitt trigger to respond to slow signal transitions, and circuitry to control the signal excursion at the input, like a diode clipper.
 

mik3

Joined Feb 4, 2008
4,846
A simple transistor can do the logic level conversion easily.
 

beenthere

Joined Apr 20, 2004
15,808
I was suggesting the more elaborate input to make the frequency counter more generally useful.
 

Thread Starter

nenadilic84

Joined Aug 7, 2009
62
I also thought to put a transistor... But I'm not quite sure.
So your suggestion is to connect output of the pulse generator to the input of this circuit.

I have made some quick simulation and I think it will work.... Thanks

But I need to measure the frequency and at the same time have the signal available... Any suggestions?

Thanks,
Nenad
 
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