Tagged Questions

0
votes
2answers
136 views

Is it possible to provide power using (effectively) a single wire?

I come to this question after a few thoughts on capacitors. A capacitor essentially transfers (and stores) energy using an electric field through an insulator. The plates of a capacitor are not ...
5
votes
2answers
103 views

Using a 5v voltage regulator - Capacitors necessary? Better options?

I am very new to electronics. I am learning as I go, and I haven't quite found the answers I need; when it comes to programming, I'm not afraid of mistakes as they happen constantly. With electronics, ...
0
votes
1answer
58 views

What is the principle of active voltage balancing/equalizing device?

I am wondering about active voltage sharing devices. Their purpose is to equally divide voltages on slightly unequal super-capacitors. I found some papers like this, but it is too scientific. I want ...
0
votes
2answers
99 views

What formulas do I need to use to design a voltage regulator circuit for a zigbee radio?

I've written the code for my zigbee radios, but now I face the obstacle of getting them onto a carrier board to allow access to VCC, GND, TX, RX via a 4 wire connector. The supply voltage is 3.712 ...
1
vote
1answer
116 views

voltage regulators and capacitors

So I'm new to electronics and was looking at some Eagle schematics when I came across the following voltage regulator schematic: My question is: would it be possible to change the regulator to ...
1
vote
4answers
412 views

How to light an LED with very low voltage and low current?

The goal is to demonstrate, visually (with a light of some sort) that power is begin generated, albeit very, very small amounts of power. What kind of set up could I use to light up an LED (or any ...
3
votes
2answers
169 views

Voltage doubler or not?

I got a quick question! Is the circuit depicted in the link indeed a voltage doubler or is it just a bridge rectifier with smoothing capacitors?
6
votes
7answers
631 views

Simplest Way to step down the 220AC with more than 10% efficiency

Objective I want to design a tiny single packaged mains-powered temperature sensor. Possibly as a multi-chip module (MCM) on one small PCB board. Constraints The temperature sensor I plan to ...
2
votes
3answers
131 views

Voltage modulation with an LDO

I am trying to build a voltage modulation circuit using an adjustable LDO and a uC switchable resistor network (to provide different Vout levels). I need the circuit to provide 4.9, 5.1 and 5.3V at ...
9
votes
3answers
467 views

What is the lowest capacitor voltage rating that is safe to use?

I'm using a few Case R tantalum capacitors (10uF 6.3v) as bulk decoupling on the 3.3v power of a 100mbps Ethernet phy. I am also using 0.1uF ceramics closer to the pins. As usual, I'm terribly ...
11
votes
1answer
600 views

How can a capacitor in a disposable camera shock you?

The battery in a disposable camera is usually a single 1.5V AA battery. It charges a large capacitor. When the capacitor is fully charged, it will contain a voltage very close to 1.5V correct? If ...
7
votes
2answers
865 views

Why does an ideal capacitor give rise to a rectangular cyclic voltammogram (CV)?

Many scientists are interested in developing supercapacitors, which have electrolyte rather than solid dielectric between the charged plates. In the field of electrochemistry, cyclic voltammetry (CV) ...
5
votes
4answers
319 views

Can a capacitor act as a fuse?

I'm replacing the capacitor for a start motor that had previously burnt up. I'm new at this. I previously referenced the following questions about replacing caps with higher ratings than spec'd: High ...
4
votes
3answers
199 views

Capacitor discharge and 1/2 terminal voltage sources

I understand that this is really basics of electronics, but I would really appreciate if somebody clearly explained following question. So here is a small set of questions related to similar topic: ...
3
votes
2answers
2k views

Increase capacitor voltage rating by using multiple capacitors?

I'm trying to find a small 1000µf capacitor for my Arduino shield. The shield is a digital synthesizer that is powered by the Arduino's 5v regulated power. After discovering that the 5v supply from ...
1
vote
3answers
174 views

selecting voltage rate for capacitors

In my project I want to use some ceramic and electrolit caps, I will need the capacitors be at least 10V rated, but what will happen if I use much higher rated caps (just to make sure in case of ...
9
votes
2answers
2k views

Can I swap an electrolytic capacitor with one with a higher voltage?

I wish I knew more about this stuff, but alas I do not. I have a radial lead aluminum electrolytic capacitor (rated 470mF and 25v) that died on me. Can I swap it out with one rated at 35V, or do I ...
4
votes
8answers
3k views

High Voltage Capacitor, in a low voltage system?

Quick question, is using a Capacitor rated for High Voltage (lets say 35v) in a System that lets say supplies 5v (like for LEDS.....or what have you) Dangerous? Since it can store UP to 35v, will it ...
5
votes
2answers
623 views

How to solve for voltage using node voltage method?

How would you solve for \$V_x\$ using node voltage method. I can solve this using \$Q_{initial}=Q_{final}\$, but I can't solve it using node voltage. Using node voltage I get ...