Need help with EE Board power

[Bubblehead]

I have an EE Board and am running WaveForms2015 v3.3.5 on a Mac computer.

I am a little new to using this board and my lab for school requires a 1.5v reference to an operational amplifier. Under the "Supplies" tab VP+ and VP- offer 100mV increments until 1V and then only whole numbers are available. Vcc has 3.3V or 5V only and Vref uses the same increments as VP+/-.

Is there a way to create custom voltage inputs? It needs to be analogue and not digital. Thanks for any help!

[D@n]

Well, let's see, if V=IR, and we want to split a voltage such as 3.3V into 3.3V, 1.5V, and 0 V, we could place two resistors between the 3.3V rail and ground, such as 6kW between 3.3V and 1.5V, and 5kW between 1.5V and ground.  Then you can tap off the 1.5V you just created between the two resistors as your reference.  Whether or not this will work for you depends upon whether or not you need a simple voltage reference, or whether or not you will be drawing significant current through the reference as well.  If the latter, than the resistor ladder I just outlined wouldn't work.

Dan

[attila]

Hello,

Type in 1.5V
This and similar fields of the application show a preset list but you can also enter custom values.

[Bubblehead]

I was too wrapped up in the lab and I did not even consider that, thanks!

[D@n]

Gosh that was too easy--I was trying too hard.  Sorry,

Dan

[Bubblehead]

I appreciate the help form both of you. Thanks again!