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You may want to look at. It has a virtual circuit board on which you place components that look like real world components. It is also closer to being a 'game' since it is developed by people who used to work in the video games industry and employs some of the technology of video games such as 3D graphics, animations, and visual effects.

Through the page there, a few lab manuals and the corresponding pre-built virtual circuit files can also be downloaded. In the lab manuals, there are schematics. So, you can compare the schematics in the manuals to the actual circuits built.

Also provides a software oscilloscope as one of the side benefits. More generally, it allows the virtual circuits built in it to interact with the Arduino board through the USB connection.

Using the built-in virtual instruments like oscilloscope, spectrum analyzer etc. Are special use cases when the virtual circuit involves just the instrument.

So, for those interested in the other capabilities of ElectricVLab, it might be a good choice since virtual instruments like oscilloscope and spectrum analyzer will become available as bonus items. But, for someone interested only in getting an oscilloscope and doesn't care for the other features of ElectricVLab, it may not be a good choice. Let me explain in more detail.First, a couple of things to know:(1) The first flipflop corresponds to the least significant bit, i.e., the right-most bit.

The second flipflop corresponds to the 2nd bit from right and so on.(2) The state of JK flipflop toggles on a clock input if both the J and K are high. Note that in the animation, battery's +ve terminal is connected to both the J and K of all flipflops, thus satisfying this condition for toggling. Similarly, in your circuit diagram also, both J and K are connected to '1', thus satisfying the condition for toggling.(3) Toggling of the state means 0 becoming 1 and vice versa.(4) Toggling in this circuit happens only on the negative edge of the pulse, i.e., when the pulse changes from '1' to '0'.

No change occurs on the positive edge of the clock input, i.e., when the pulse changes from '0' to '1'.Now, let us walk through the counter operation.Say, the state (i.e., the state of the 4 Qs) is initially 0000. Next the first clock signal comes. On the negative edge of that clock pulse, the first flipflop toggles and its Q becomes 1. Hence, the state now is 0001. Note that the second flipflop does NOT toggle now because what has happened at its clock input is just a 0 to 1 transition (and not the 1 to 0 transition needed for toggling).Now, the second clock pulse arrives. On the negative edge of that pulse, the first flipflop toggles again and now becomes 0.

However, note that the Q of the first flipflop is connected as clock to the second flipflop. Thus, the 1 to 0 transition at the first flipflop's Q toggles the state of the second flipflop making it go from 0 to 1. Note that the third flipflop does not change state now because what happened at its clock input is just a 0 to 1 transition (and not the 1 to 0 transition needed for toggling). In summary, now the first flipflop's Q is 0, the second flipflop's Q is 1, and the third and fourth are 0. That is, the state now is 0010.So far, the transitions, 0000, 0001, 0010 have happened.It continues from then on through 0011, 0100, 0101.Seems like your misunderstanding lies in not realizing that these are edge-triggered flipflops and their state toggles only on the negative edge of the input clock signal, i.e., on the 1 to 0 transition.

If you now take a look at the animation, it should be clearer. IMHO, Arduino is not a good choice for an 8 year old. I would suggest waiting at least a couple of more years before he starts on Arduino. Let him first build up some knowledge and experience about electricity and electronics in general. You may want to try software which applies some of the technology of video games to teach electricity and electronics.

In addition to serious analog/digital electronic components, that software also has fun components like fireworks, fountains, lights etc. Which your son would enjoy. It also has virtual instruments, current flow animations etc. Which will give interesting visual feedback about circuit operation. Let him get started with things like Ohm's law, simple resistor circuits, and basic logic gates. In fact, you can combine his interest in math with electronics. For example, you can teach him first to analyze simple series and parallel combination of resistors.

Then gradually increase the complexity of the resistor networks and have him calculate the currents in those which would be good math exercises. Then, build the circuits in ElectricVLab and compare the calculated values with the actual values displayed in the software. Similarly, he can learn a lot and improve his logical reasoning skills (a good preparation for programming) just using logic gates. First start with simple logic gates and then combine more and more logic gates to build more complex functions.

While doing all these, combine the fun components available in the software so he keeps enjoying it. Just a side remark: I am really intrigued by this reference to 'Jacob's Ladder'. I had not even heard of it until about 2 years ago. During the course of our work on, in addition to all the main-stream electronic components, for fun, we wanted to add some playful components like fireworks, fountains etc. Escape the game armor games game. A colleague of mine suggested that we add 'Jacob's Ladder'.

That was the first time I heard about it and we indeed added it as you can see by scrolling down to the 'Playful' category in the. Of course, in ElectricVLab, all that that component does is just produce the Jacob's Ladder visual effect when the component is powered. But, this thread here made my day since I now realize it is something some electronics hobbyists indeed do think about though I had not thought so at the time. You may want to take a look at. It employs some of the technology of video games (which is something kids usually get attracted to) such as 3D graphics, animations, and visual effects to make it visually rich and fun.

Here is a screenshot video showing its visual capabilities.You can take a look at the 'Gallery' and other pages of for more details. Here are the links to a couple of more YouTube videos showing the workings of the ElectricVLab software.By the way, the virtual circuits built in ElectricVLab can also interact with physical Arduino boards. So, while the kids use it for learning about electricity and electronics, you can use the oscilloscope of ElectricVLab to view the signals on your Arduino board, send control signals to your Arduino board etc. Some of the early steps towards learning programming can be getting familiar with basic logic operations (AND, OR etc.) by playing with simple logic gate circuits. Later steps in programming can be modifying, sequencing the visual effects from an Arduino program. I am a contributor to that software.

So, if you have any questions, feel free to message me.