# Tagged Questions

3k views

### Circuit to safely power-down Raspberry Pi

I want to use a Raspberry Pi as an XBMC server in the car. The XBMC docs say that you should always use the shutdown command before disconnecting the power. I don't want to have to (tell my wife to) ...
232 views

### Why is this capacitor not discharging?

I am trying to implement a delay mechanism out of passive components. The digital input in this case is a PIC input pin. The operation is as follows. The capacitor is pre-charged to 5v, and then the ...
730 views

### Calculating resistance given capacitance and charge over time

Given the seconds $t$ it takes a capacitor (with farads $C$) to discharge from 5 volts ($V_0$) to 0 volts ($V_t$), how do you calculate the effective ohms of resistance R in a circuit? Based ...
467 views

### Automatically discharging capacitor [closed]

Say I have a capacitor of 100uF connected to 2Volts battery supply (In real circuit, this will be a solar panel exposed in the sun)... After some time, the capacitor will be charged fully with a ...
230 views

### Capacitor discharge after charge

I have this circuit for charging a capacitor: What I need is a circuit for discharging the capacitor after 'V' (the voltage across the 100 µF capacitor) has reached the maximum value of 2V. I ...
408 views

### Constant power discharge of a non-ideal capacitor

My employer sells boost converters to hold up motor drives during power loss. These boost converters are fed from capacitor banks. In order to size these banks correctly, we need to take their ...
12k views

### How can I quickly and safely discharge a charged capacitor (small and low voltage; <= 42V)?

I am learning how to use capacitors (ceramic and electrolytic from 1pf - 1000uf) and am trying out various experiments using a breadboard. I am constantly adding/removing things to my layout to see ...
3k views

### Capacitor Discharge through Constant Current Source

I was just thnking of how to model the voltage decay from a fully charged capacitor through a constant current source (CCS). A good approximation to this would be to model the constant current source ...
286 views

### charging and discharging capacitors

I'm wondering if it's possible to charge say a capacitor with a stepper motor (~12V DC after rectifying), which when it reaches its maximum capacity discharges. I'd like the discharged power to ...