Hi,
I have some similar counter circuit to the one below, I'm trying to add a reset switch. At the beginning I thought that a simple switch that disconnects power source should work and reset counting.


Later, I came across the circuit below and noticed that they have the reset switch set up through pin R or 15 tied to Gnd through a 1Kresistor!!


The question is, which setup for the reset switch will help more in clearing the counter's memory?

 

Don't cycle power. Use the reset. That's why it's there.

 

Don't cycle power. Use the reset. That's why it's there.

Thanks WBahn. So, if I'm using two decoders, can I setup my Reset switch for both decoders just like in the image below, or it is enough to have the switch on the first main Decoder U1?

 

Have a look at the first circuit and then see how the second one is quite wrong. Try to redraw it with the correct connections. We could tell you what to do but it is better if you figure it out.

 

Have a look at the first circuit and then see how the second one is quite wrong. Try to redraw it with the correct connections. We could tell you what to do but it is better if you figure it out.

Have a look at the first circuit and then see how the second one is quite wrong. Try to redraw it with the correct connections. We could tell you what to do but it is better if you figure it out.

Hi dendad,
Like this you mean :

 

Have a look at the first circuit and then see how the second one is quite wrong. Try to redraw it with the correct connections. We could tell you what to do but it is better if you figure it out.

Sorry, this is the correct one:

 

That looks better

 

That looks better

Thanks a lot dendad for correcting me and helping me out.

 

Disconnecting the power won't reliably work, since the counters likely will come up in a random state when powered off and on, not in an all zeros state.

 

Disconnecting the power won't reliably work, since the counters likely will come up in a random state when powered off and on, not in an all zeros state.

That looks better

Thanks for the clarification crustchow, that's an important info that I was wondering about! Cool! I just built the real physical circuit with the reset switch based on my last updated circuit shown above but the whole circuit didn't work! Not sure why! Though it was working before by only grounding pin 13 and 15 together to Gnd! Any thoughts!

PS: Ignore above note, it works, again wrong breadboard connections . Thank you guys all!