Divide one arbitrary Voltage by another arbitrary Voltage

[halfpower]

I'm trying to figure out a way to do this with relatively low frequency AC voltage. What parts would I use to do this?

 

[Mark R]

Do you want the ratio calculated instantaneously, or do you want a ratio of the rms voltages? Different approaches are needed.

Do you want to do this using analog computation, or do do you have access to a digital representation of the voltages?

If you want instantaneous analog then just use an analog multiplier circuit - multiplier

 

[halfpower]

I need an analog circuit of which the output voltage y1 is the ratio of the input voltages x1, and x2. I don't really have to know what the voltage is. I just need the voltage itself.

 

[CSMR]

Er no it's not possible because voltages are only defined up to a constant. V1/V2 does not correspond to anything observable.

You are bascally needing to find for example given a voltage of 5v and another voltage of 5v a voltage of 1. Now what voltage does 1 correspond to?

 

[Mark R]

The multiplier chip I linked to will do the job. How to configure it for division is shown in the manual.

The catch may be that it's operation is instantaneous.

So if your 2 input AC signals aren't syncrhonised then your output will be AC as well. Even if they are synchronised, there will be substantial noise at the zero crossings.

You may need first to convert your AC signals into an RMS type average, in which case use a suitably configured op-amp circuit to convert the signals before passing them to the divider circuit.