United StatesA handy engineering utility that solves for voltages or resistor values in a common voltage divider circuit. Enter three terms (out of Vin, Vout, R1 or R2) and this app will solve for the fourth term automatically. The resistor picker will only let you pick from actual resistor values that exist. It's a great time saving tool for quickly selecting resistor values in a switching power supply design or any other circuit that incorporates a voltage divider. When solving for a voltage, select two resistor values and one of the voltages. The remaining voltage will be displayed automatically. The max and min possible voltages will also be displayed based on the resistor tolerances. The current and power through the divider will be displayed at the bottom of the screen. When solving for a resistor value, select two voltages and one resistor value. The remaining resistor value will be displayed in yellow. This is an ideal value. Use the resistor picker to select an actual resistor value close to that ideal value. You can then tell the app to solve for Vin or Vout to see if the resulting voltage meets your design requirements.
DONT BUY THIS APP
dont work, i need to calc what resistor i need to convert 12v into 7 and i cant!!! this app dont work, vert spensive and slow, also ADS!!!!! on a paid app, omg, dont buy this
United StatesNeeds Update!
Since iOS 6 update, no longer works. Crashes soon after you start entering values. Remove, reboot, reinstall, reboot doesn't help.
United StatesDoes what it says, nothing more.
Nice user friendly interface. Would be handy if it displayed power dissipation of each resistor, then displayed minimum resistor package size (i.e. 0603 SMT for <0.1W, etc.).
United StatesMade me look good.
I used this app at work to knock out 110 voltage dividers in no time at all. Worth every cent.
United StatesSimply Beautiful
Elegant in form and function, so fun to use it makes me want to start a new electronics project just to play with it. We need more apps like this, I'd love one for playing with transistors or analog ic's.
United Statesmore than a solver
I design power supplies so I often have to calculate the feedback voltage divider. Sure, it is easy enough in a calculator but having all the standard 1% and 5% values in this app makes things easy. I normally have to solve for a R value and then look up the closest real 1% value. Then I solve to find my actual output voltage only to find that it isn't close enough so I have to do it again with another R value. With this App I can just have the it solve for the ideal value and then the resistor selction wheel shows me the closes real value resistors. I can easily see what my output voltage would be using those values. Pros: works well and looks pretty good. It is cool to see the color bands on the resistors change with value Cons: On my 2G iPhone the resistors had black splotches on them. All is good with my iPhone4 (I think 3G and up don't have this problem).
United StatesExcellent
This is an excellent app with a nice, clean GUI that will prove to be a favorite when building your next circuit.
United States
Updated for iOS 16
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