Hello to all,
I have a school project where I need to study the effects of frequency, voltage, and current on an electrolysis cell. I also need to consider the resonance frequency of water, which is 42.8 kHz and its harmonics. So, I would like to build a PWM (Pulse Width Modulation) circuit that can provide pulses at a chosen frequency and allow me to adjust both the current (0-3A) and voltage (0-12V). Can you help me with some advices and a schematic?

 

Welcome to AAC!
Since this is your school assignment, please post your best effort at a design so that we can give guidance where needed.

 

I will try,but it takes me too much to find the suitable components. It is better for me too see a scheme and to try to understand how it works. You asked me for a higher level. Thx anyway

 

I have a school project where I need to study the effects of frequency, voltage, and current on an electrolysis cell. I also need to consider the resonance frequency of water, which is 42.8 kHz and its harmonics. So, I would like to build a PWM (Pulse Width Modulation) circuit that can provide pulses at a chosen frequency and allow me to adjust both the current (0-3A) and voltage (0-12V). Can you help me with some advices and a schematic?

I recommend you to read with attention this 3-pages thread:
https://forum.allaboutcircuits.com/...cuit-op-amp-mosfet-driver.166021/post-1464183
It is almost exactly your case, only frequency is 30 kHz.

 

Hello to all,
I have a school project where I need to study the effects of frequency, voltage, and current on an electrolysis cell. I also need to consider the resonance frequency of water, which is 42.8 kHz and its harmonics. So, I would like to build a PWM (Pulse Width Modulation) circuit that can provide pulses at a chosen frequency and allow me to adjust both the current (0-3A) and voltage (0-12V). Can you help me with some advices and a schematic?

What 'chosen' frequencies do you need in your design?
I would recommend starting with a block design. That is create a 'high level' abstraction of the circuit. You can then break the problem down to smaller chunks.

Here is the basic idea:

 

Hello to all,
I have a school project where I need to study the effects of frequency, voltage, and current on an electrolysis cell. I also need to consider the resonance frequency of water, which is 42.8 kHz and its harmonics. So, I would like to build a PWM (Pulse Width Modulation) circuit that can provide pulses at a chosen frequency and allow me to adjust both the current (0-3A) and voltage (0-12V). Can you help me with some advices and a schematic?

Hello there,

This is interesting, although I have to defer any advice at the moment I will help in the future if I can.

But first, this is interesting because I have never heard about any specific resonant frequency of water, or is it that you are working with a given volume of water for every experiment.

 

Hello there,

This is interesting, although I have to defer any advice at the moment I will help in the future if I can.

But first, this is interesting because I have never heard about any specific resonant frequency of water, or is it that you are working with a given volume of water for every experiment.

I've never heard of a resonance frequency of water either. Can the TS provide any references for this phenomenon?

 

allow me to adjust both the current (0-3A) and voltage (0-12V).

You can limit the voltage and current to specific values, but you can't adjust both at the same time

 

Various random places on the internet give it as 1.1x10^14Hz, which for something as titchy as a water molecule sounds an awful lot more likely than 42kHz.

 

I've never heard of a resonance frequency of water either. Can the TS provide any references for this phenomenon?

Seems it is from some source, similar to this: https://books.google.kz/books?id=ud...printsec=frontcover&hl=ru#v=onepage&q&f=false

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ADDED:

Can it do cold fusion as well?

It is much better than cold fusion, because of 2000% efficiency and no dangerous radiation.

 

Seems it is from some source, similar to this: https://books.google.kz/books?id=ud...printsec=frontcover&hl=ru#v=onepage&q&f=false

View attachment 304770+++View attachment 304772

Can it do cold fusion as well?

 

Seems it is from some source, similar to this: https://books.google.kz/books?id=ud...printsec=frontcover&hl=ru#v=onepage&q&f=false

View attachment 304770+++View attachment 304772
ADDED:

It is much better than cold fusion, because of 2000% efficiency and no dangerous radiation.

This is starting to sound like an over 100 percent efficient device.