Tagged Questions
4
votes
1answer
86 views
The voltage of capacitor across battery never reaches battery voltage
I made some homemade vinegar batteries. The voltage of each cell was measured around 0.45V. I have 18 of them in series and I measured around 6.5V for the whole chain.
Since the vinegar batteries ...
2
votes
1answer
193 views
Simple generator to light a series of LEDs question
Playing around with a simple circuit idea with friends but none of us have really worked with circuits since college so we need a little guidance. The thought is to have a small generator (someone ...
1
vote
0answers
94 views
what is the best way to charge a capacitor bank from an SLA battery
I need to charge a capacitor bank of 25 2.5v 55 farrad capacitors from a 2v 200Ah gel cell SLA battery, and modify the discharge time so that it discharges at 150Ah. I was wondering what the most ...
6
votes
4answers
622 views
Pulse-powering heavy loads with a coin cell
Lithium coin cells are rated for fairly low standard current draws, on the order of 1 to 5 mA. Also, while they allow greater pulsed current draws (i.e., periodic bursts), this appears to be ...
2
votes
2answers
113 views
Need chargeable momentary 15 watt regulated voltage source
I'm working on a RF telemetry side-project that requires an amplifier IC to be run for about 5 seconds bursts between charges. The system is portable and runs off of a 3.3V battery that can supply ...
4
votes
4answers
417 views
Using a high C capacitor
Let's say I've got a device which requires 700mA at 5V and I want to power it of a capacitor for one full hour. Now if I calculate the required capacity I get: C = I*t/V = 504 Farad. Capacitors like ...
4
votes
2answers
450 views
Charging 35V 470uf capacitor with coin cell
I want to charge a 50V 470uF capacitor up to 35V with the smallest battery possible. Can a coin cell do this 3000 times? Possibly a 2450 or 2477 coin cell? Also, can the capacitor be fully charged ...
2
votes
3answers
1k views
How long can a capacitor stay charged?
If I fully charge a 1.5V capacitor from 1.5V battery, how long can it keep the charge? If I connect it to 1.5V bulb would it lose that charge instantly? If yes why? Where would it go?
10
votes
1answer
1k views
Possible causes for AAA battery to explode
Today, the AAA battery in my remote control exploded. The "pop" sound is pretty loud. I've been using this remote control for years, and I'm more inclined to believe that it is the battery issue ...
3
votes
2answers
2k views
How to replace 6V battery with capacitors
I have an old motorcycle that runs on 6 volts. There is no electric starter, just a kick starter, and the headlamp is switchable to 'off'. Since this is an older bike that isn't run on the A roads and ...
17
votes
4answers
851 views
Supercap compared to a battery
What is the current state of things when it comes to super capacitors and batteries? Are super caps anywhere near rivalling LiPo's in capacity? I've often heard people talking about super caps as ...
