# Tagged Questions

68 views

### Run a 5VDC 0.2A fan from a 24VDC 3.75A power supply - Help Needed

I am working on a project that is using a 24VDC 3.75A power supply and would like to have a small fan (5V 0.2A) to cool the amplifier and switching circuits within an enclosure. Could someone help ...
66 views

### inverting op-amp circuit

Why is -Vout equal to the voltage going through Rf? here is a link to a site which explains the inverting amplifier circuit but I couldn't understand why this is.
130 views

### Voltage Controlled Attenuator

I'm trying to create a DC voltage attenuator which linearly scales the loss relative to an applied control voltage "Vc". In other words, K = Vout/Vin is a linear function of Vc. Vin is guaranteed to ...
128 views

### How do I calculate the voltage at these locations?

I'm wondering how to calculate the voltage on the following charts (series circuit and parallel circuit). I'm interested in the math process involved, not the answer. I'm mostly confused about how ...
189 views

### Increase resolution of voltage divider

I have a lead-acid battery on which I am using a voltage divider to measure the remaining charge. Its my understanding that an example battery could discharge from 100-0% over say 10.5V - 12V. ...
104 views

### Scaling voltage to meet two conditions at once

I am using an IC (STM6600) which, among other functions that I need, is also capable of Undervoltage Monitoring. It works like this: The IC monitors VCC in comparison to two thresholds, V_Low and ...
149 views

### Setting a part's VCC slightly lower than board's supply voltage

I'm interested in using the undervoltage detection feature (in addition to the primary function) of this chip. This IC draws 6 uA (microamps), and accepts any VCC between 1.6V and 5.5V. The ...
1k views

### Lowering 3.3V to 3V

I am attempting to lower a 3.3V source to 3V for use with a sensor (which has a rating of 3V +/- 0.1V). Based on the other answers in here, I believe that placing two resistors in series would achieve ...
275 views

I am looking at a MCP3008 datasheet and it says that it has a maximum current drain of 150uA, and a typical current drain of 100uA. I am building a voltage divider to knock down 96V to 3V. As this ...
1k views

### How does the electricity “know” the ratio of the resistance in a voltage divider?

I'm having a hard time conceptualizing what/how things are working in a voltage divider setup. I've read a couple other questions/explanations where the answerer has said to "not think about it in ...