# Division of Voltage

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#### STG

##### New Member
Does anybody know of a device that can devide two voltages.

#### cjg

##### New Member
What kind of voltage ?

Are these analog voltages or digital ?

I cant think of any way to divide two voltages except with a microcontroller ... you can program the arithmetic function there .... in using a microcontroller you may be able to use an analog signal .... not sure though ...

Or you can do it synthetically, leaving the second voltage out of the equation (ie. voltage divider, ect)

cjg

#### Nigel Goodwin

##### Super Moderator
Try telling us exactly what you want to do, we may be able to make suggestions - your existing question doesn't give anywhere near enough details.

#### ljcox

##### Well-Known Member

However, making a guess as to what you mean, there are analogue techniques available to do arithmetic functions such as:- multiply, divide, square, square root, take the exponent, or logarothm, etc.

Len

#### STG

##### New Member
The first voltage is the output voltage of a transresistance amplifier, the second is the voltage of the device that gave out the current. This division gives me the impedance value

#### Nigel Goodwin

##### Super Moderator
STG said:
The first voltage is the output voltage of a transresistance amplifier, the second is the voltage of the device that gave out the current. This division gives me the impedance value

Presumably this is for an impedance meter? - a microcontoller would seem the easiest solution. Use two A2D channels to read the two voltages, divide them accordingly, then display on an LCD module.

A PIC16F876 has 10 bit A2D built-in, and would do nicely.

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