PConst167
Member
Friends, I have been struggling with a problem for days now and I am getting frustrated.
I have a simple circuit consisting of a 74HC4040 12bit binary ripple counter, and a 74HC08 AND gate.
I take two outputs from the counter 12 and 11 for example, and feed it into the gate, then look at the output on my oscilloscope.
The output rather than being the AND of both inputs, is rather a superposition of both signals. It's unstable and looks strange.
I have made a video of the scope showing the signals, and also here;s a photo of the circuit set up.
Please help me to find out what is going on. I have tried everything. If the problem was due to the fact that the counter is a ripple counter, then wouldnt I just get some hazards and that;s it? This is really different in that the signal is not stable and flikkers all the time.
Thank you in advance.
**broken link removed**
I have a simple circuit consisting of a 74HC4040 12bit binary ripple counter, and a 74HC08 AND gate.
I take two outputs from the counter 12 and 11 for example, and feed it into the gate, then look at the output on my oscilloscope.
The output rather than being the AND of both inputs, is rather a superposition of both signals. It's unstable and looks strange.
I have made a video of the scope showing the signals, and also here;s a photo of the circuit set up.
Please help me to find out what is going on. I have tried everything. If the problem was due to the fact that the counter is a ripple counter, then wouldnt I just get some hazards and that;s it? This is really different in that the signal is not stable and flikkers all the time.
Thank you in advance.
**broken link removed**