My new approach

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The chip is actually this in the attachment

Hct7046

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The part of the sensor that was exposed to the ultrasonic melted the silicon on top underwater

It seem it transformed the waves into heat directly

Silicon melts at high temperature than water evaporates

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I discovered that the receiver side of the sr04 sensor uses a lm324 amplifier in 3 stages

Knowing that we can use it probably directly as feedback without need for other amplifier

I didn’t tested but since it amplify a simple reflection it probably will not need the 3 stages to get the required square

That because we actually want it to feedback filtered” it need to detect the build up of resonance and not whatever signal it receive


Just need to taken the piezo out of the board and use a Good cable for wiring it

I will use epoxy now instead of the silicon because now I’m sure it will work…

There is a waterproof sr04 around you could probably get that instead and will be easier for you

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Here is the labview

I took the day to get it back on function

The pc is 24 years old…

I got the screen with a friend to make it work

The cdaq has 4 modules

2 for current or temperature having 4 inputs each

It reads microvolts

1 with 8 voltage inputs up to 60v 12bits

And 1 for frequency counter with 2 inputs

The gate duty cycle is a voltage read for example to the potentiometer

It can plot directly the results on the screen will be very usefull now to improve the process

I’m going to add a small resistor in series with the cell and connect to ground than a test point on the resistor to get the current and one at the cell to the it’s voltage the impedance is the voltage / current

Of course I will use voltage divider because the input voltage is 60v max

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The main problem with labview is the sample rate… it would work nice for frequencies under 1khz better than for 10khz


The main aspect of the waveform predicted is that is a result of what is going on the cavity however it’s caused by the input waveform

The input wave form is a single square wave pulse and is rounded by the coils

When the resonance is going with the provided geometry and field I described it will create a doubled pulse

It work like a kind of active rectify or sychronois dc generator

The interesting is that it builds up the oscillation only at the cavity frequency but will only appear like a double pulse if locked in phase

Otherwise it will create a superimposed wave

To measure this kind of signal on osciloscope we can use the peak function with ac coupling

If we aply a constant dc than is easy to see how the amps relates to the pulse phase

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The chip is actually this in the attachment

Hct7046

A PLL chip....

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Here is the labview

I took the day to get it back on function

The pc is 24 years old…

I got the screen with a friend to make it work

The cdaq has 4 modules

2 for current or temperature having 4 inputs each

It reads microvolts

1 with 8 voltage inputs up to 60v 12bits

And 1 for frequency counter with 2 inputs

The gate duty cycle is a voltage read for example to the potentiometer

It can plot directly the results on the screen will be very usefull now to improve the process

I’m going to add a small resistor in series with the cell and connect to ground than a test point on the resistor to get the current and one at the cell to the it’s voltage the impedance is the voltage / current

Of course I will use voltage divider because the input voltage is 60v max

24 years old? What is it? An IBM XT or 286   

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I remember I got this motherboard I was 14 years old is an asus p4p 800 Pentium 4 I guess

10 years ago when I was very into the project I got a new video card (old) kkk for it and some memory and put it back to work

Was my first attempt to make a Mac on pc but was end up only for labview and lab finality

Is very slow but is enough for the labview apparently

I have also an ibm laptop seems even older but is much slower it came with the national instruments cdaq and modules it were from a race car factory here in Brasil that was from a close friend and closed like 20 years ago…

Apparently they could taken Al the readings from a race car with it!

I just build into my rack a place to put the computer in

This way I can drive to the kitchen or even outside for testing with full equipment organized all ready to go

Procrastinating a little