I am working on a final project for a 2-Year EET degree. It is an extremely basic analog calculator that takes the coefficients of 3 equations with x, y, z variables and outputs the values for x, y and z. The circuit operates using op amps.
The problem I'm running into is that I need a way to multiply a resistance, probably up to 50k or maybe 100k depending on how ambitious I get with the possible range of my coefficients. I thought of using a digital resistor, but the maximum voltage will be somewhere around 15V, and most of the digital resistors I have found cap out lower than this. Can anyone suggest a better way to do this?
I can always opt for a more complex solution, but this feels like something that should be easier than I'm making it.
I know this circuit is not really practical, it's really more of a learning experience and a way to demonstrate what I've learned in the course. Also, analog computers are fascinating.
The problem I'm running into is that I need a way to multiply a resistance, probably up to 50k or maybe 100k depending on how ambitious I get with the possible range of my coefficients. I thought of using a digital resistor, but the maximum voltage will be somewhere around 15V, and most of the digital resistors I have found cap out lower than this. Can anyone suggest a better way to do this?
I can always opt for a more complex solution, but this feels like something that should be easier than I'm making it.
I know this circuit is not really practical, it's really more of a learning experience and a way to demonstrate what I've learned in the course. Also, analog computers are fascinating.