Tagged Questions
2
votes
4answers
785 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) ...
3
votes
1answer
184 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 ...
1
vote
1answer
327 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 ...
-1
votes
3answers
228 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 ...
-1
votes
1answer
153 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 ...
7
votes
1answer
322 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 ...
11
votes
3answers
6k 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 ...
2
votes
2answers
2k 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 ...
2
votes
1answer
224 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 ...
6
votes
4answers
4k views
Is it possible to fire a spark plug from batteries
I wanted to create a remote fired trigger for a spud gun so I can trigger it remotely.
Ideally I'd like to use a spark plug to fire because it should work well for gas mixtures but the trigger is ...
9
votes
4answers
8k views
How do I calculate how fast a capacitor will discharge?
Say I have a 1F capacitor that is charged up to 5V. Then say I connect the cap to a circuit that draws 10 mA of current when operating between 3 and 5 V. What equation would I use to calculate the ...
