4026 decade counter and 7 segment display

Thread Starter

Spence

Joined Apr 23, 2010
49
I've got some 4026's counting and displaying the count on 7 segment displays, all working fine.

But what I want to do is display the frequency, not the count.

The 4026 has facility to blank the display, reset, and stop/start clock.

I can't seem to get my head round how to do it because the stop clock function seems to blank the display.

I've got a 555 timer connected to a 4027 flipflop, set to give 1 second high, 1 second low.

Any advice appreciated.
 

tom66

Joined May 9, 2009
2,595
You need to gate the signal. Say you want to measure 100 Hz. If you gated it for 1 second you would count 100 ticks and this would be displayed. You could then reset for another measurement. Best to use a precision oscillator for the 1 second reference.
 

Wendy

Joined Mar 24, 2008
23,415
Tom has the right of it, but first you need to make a multidigit counter, I would recommend 6 digits, but 4 would work.

In addition to measuring frequency, measuring period is also an extremely useful feature.

While a AND gate is clocked to measure frequency, the same AND gate can be clocked with a precision time base and the measured frequency is used to enable the AND gate. It is a very minor change that gives a different parameter.
 
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