# hnc electrical and electronic engineering maths

Hello there i am currently in the middle of assignment two on HNC maths. i am just wondering if i am on the right track with my graph in desmos. The question is asking me to plot the graph for :
Your company produces radio transmitters and part of that circuit multiplies a high frequency sinusoidal
carrier signal 𝑉𝑉𝑉𝑉, with a much lower frequency audio signal 𝑉𝑉𝑉𝑉.
The relevant input and output signals are shown below.
𝑉𝑐 = 8 cos (2𝜋250 10^3t)
𝑉𝑎 = 5 cos (2𝜋20 10^3t)
𝑉0 = vc + (Vc*Va/8)

Use one of the graphical packages listed at the beginning of this assignment to plot 𝑉𝑉𝑐𝑐, 𝑉𝑉𝑎𝑎,
𝑎𝑎𝑎𝑎𝑎𝑎 𝑉𝑉𝑜𝑜, and include
a screenshot of your plot as part of your submission. Ensure the scale of both axes is carefully chosen to
clearly show the detail of all 3 waveforms.
If you drew a smooth curve linking the peaks of the positive half cycles of the output waveform, Vo, which is
called the envelope of the waveform, what can you observe about that curve?

I have an image of my graph but i am not sure how to add that to the post. I will attach if possible.
A2 | Desmos This is the link to my graph

Thanks for any help on this
(edited 1 month ago)
Original post by Sparksrus
Hello there i am currently in the middle of assignment two on HNC maths. i am just wondering if i am on the right track with my graph in desmos. The question is asking me to plot the graph for :
Your company produces radio transmitters and part of that circuit multiplies a high frequency sinusoidal
carrier signal 𝑉𝑉𝑉𝑉, with a much lower frequency audio signal 𝑉𝑉𝑉𝑉.
The relevant input and output signals are shown below.
𝑉𝑐 = 8 cos (2𝜋250 10^3t)
𝑉𝑎 = 5 cos (2𝜋20 10^3t)
𝑉0 = vc + (Vc*Va/8)
Use one of the graphical packages listed at the beginning of this assignment to plot 𝑉𝑉𝑐𝑐, 𝑉𝑉𝑎𝑎,
𝑎𝑎𝑎𝑎𝑎𝑎 𝑉𝑉𝑜𝑜, and include
a screenshot of your plot as part of your submission. Ensure the scale of both axes is carefully chosen to
clearly show the detail of all 3 waveforms.
If you drew a smooth curve linking the peaks of the positive half cycles of the output waveform, Vo, which is
called the envelope of the waveform, what can you observe about that curve?
I have an image of my graph but i am not sure how to add that to the post. I will attach if possible.
A2 | Desmos This is the link to my graph
Thanks for any help on this

Hi, I am also doing this course. Your graph looks fine to me, it's the same as mine at least! Did you have any luck with Part 2?I have been scratching my head for awhile now...
Original post by Glendular
Hi, I am also doing this course. Your graph looks fine to me, it's the same as mine at least! Did you have any luck with Part 2?I have been scratching my head for awhile now...

Hi mate was part two the vector diagram i cant remember off the top of my head ill have a look
Original post by Sparksrus
Hi mate was part two the vector diagram i cant remember off the top of my head ill have a look

Hello , anyone got any ideas for Task 3 part 3. Really struggling with it
Original post by Jspur48
Hello , anyone got any ideas for Task 3 part 3. Really struggling with it

Hi mate what part are you struggling with? What have you got so far? Its not as complicated as you think. I messed around with this for days only for it to be fairly straight forward