# Simulated Sine wave propagation

#### KiwiPtr

Joined Mar 25, 2022
3
Hi, I'm looking to simulate propagation of a sine wave through a silicone mould we are creating (In the direction indicated below). I was planning on doing this by varying the voltage in each on the wires over time, with some lag in the variation, to give the effect of a sine wave moving along the mould.

Does anyone possibly have some suggestions on what could be used to effectively vary the analog voltage in each of the wires over time, or other simpler methods to achieve the goal?

Thanks

#### Papabravo

Joined Feb 24, 2006
20,394
How does varying the voltage in a wire that does not form a complete circuit accomplish anything? What are you hoping to observe?

#### Delta Prime

Joined Nov 15, 2019
1,311
Hello there , welcome to AAC! are you looking for a visual representation of a sine wave?
Does the silicone mold have any special properties?

#### KiwiPtr

Joined Mar 25, 2022
3
Hello there , welcome to AAC! are you looking for a visual representation of a sine wave?
Does the silicone mold have any special properties?
Thanks for replying, the silicon is to be mildly doped with graphene to give a degree of electrical conductivity.

A measuring device, consisting of an array of discrete electrodes is then placed in top of the silicon to record the voltage at different points on the silicon surface.

This is done over time such that the variation in voltage over the mould surface can be mapped.

The varying voltages plotted against time will ideally give the visual of a sine wave propagating down the length of the mould, just so we have something distinct to validate against.

Hopefully this makes a bit of sense, I can draw a diagram of anything specific that might help?

#### KiwiPtr

Joined Mar 25, 2022
3
How does varying the voltage in a wire that does not form a complete circuit accomplish anything? What are you hoping to observe?
We don't need to observe any current flow, just need to observe the discrete voltage of multiple points on the mould surface over time.

#### Ian0

Joined Aug 7, 2020
8,403
Does it have to be a sine-wave? It would be dead easy with a squarewave!

#### Bordodynov

Joined May 20, 2015
3,090
See

#### eetech00

Joined Jun 8, 2013
3,431
Thanks for replying, the silicon is to be mildly doped with graphene to give a degree of electrical conductivity.

A measuring device, consisting of an array of discrete electrodes is then placed in top of the silicon to record the voltage at different points on the silicon surface.

This is done over time such that the variation in voltage over the mould surface can be mapped.

The varying voltages plotted against time will ideally give the visual of a sine wave propagating down the length of the mould, just so we have something distinct to validate against.

Hopefully this makes a bit of sense, I can draw a diagram of anything specific that might help?
Can you draw an electrical representation of the mould surface?

#### Marley

Joined Apr 4, 2016
501
How many outputs from the power source do you need? You have drawn 14. Is this just an example or a requirement?
How pure a sign wave do you need? Could the wave be constructed with a limited number of steps?
What frequency?
What voltage?
What will the load current be (what is the resistance of the silicone/graphene substance)?

Basically, it can be done. My thinking is digital - use a micro-controller with a number of D to A outputs (or filtered PWM outputs), construct the sine wave with voltage (or PWM) steps probably from a look-up table in memory. Each output might require an amplifier to get the voltage swing you need.

Analog could be done with a delay line probably but would require massive capacitors and inductors at a low frequency!

#### Ian0

Joined Aug 7, 2020
8,403
I was going to suggest a version of the CD4018 circuit, but I was waiting for further information.