Questions tagged [electrolytic-capacitor]
An energy-dense polarized capacitor type, used in low-frequency filtering applications.
372
questions
2
votes
3
answers
206
views
Simple rectifier circuit fails under load
I have a problem with a simple rectifier circuit that is designed to drive a DC motor. The motor is part of a ripple tank for a high school physics lab.
The input to the circuit is 12 VAC from a bench ...
- 21
3
votes
1
answer
1k
views
Connecting electrolytic capacitors in series to increase maximum voltage
I need to use a capacitor in a DC circuit where it would store somewhat higher voltage (hundreds of volts). The cheapest way to do that (in my case) is to connect multiple electrolytic capacitors in ...
- 248
-1
votes
1
answer
155
views
Speaker protection circuit with polarized capacitor seeing reverse voltage. Why? How?
I am looking at this speaker protection circuit found in a vintage Technics receiver.
The signal from the speakers comes from the wire highlighted in green, coming from the output of a class AB power ...
- 53
0
votes
1
answer
209
views
Electrolytic capacitor with zero bias
This is a very common trick used in many audio amplifiers with an op amp topology to minimise the output offset by creating a unity gain for DC. Usually the electrolytic capacitor sits on the ground ...
- 613
0
votes
4
answers
474
views
Is it possible to replace the electrolytic capacitor in a full wave rectifier bridge with a ceramic capacitor?
Why do we use electrolytic capacitors in full wave rectifier bridges? Is it because we can have huge capacitance with electrolytic type or is it because the output is DC voltage where polarity is a ...
- 19
1
vote
0
answers
133
views
Tantalum capacitor at low temperatures
What could happen to a solid tantalum capacitor that operates below the lower temperature range defined by the manufacturer (-55°C)?
From my understanding, there would be a performance issue with ...
- 11
0
votes
0
answers
60
views
What could be the cause of a limit in the voltage supplied to a capacitor?
Recently I built a very basic 2-stage coil gun for a school project. Each coil was powered by an electrolytic capacitor. In order to charge the capacitor, the coil connected to an IGBT (insulated-gate ...
3
votes
2
answers
542
views
Electrolytic capacitor and AC
I'm doing an experiment to investigate the relationship between frequency and capacitance. The experimental setup is to connect an aluminum electrolytic capacitor to a function generator and use an ...
- 105
4
votes
1
answer
962
views
How to recognize 105° C rated electrolytic capacitors?
If there is no explicit working temperature printed on the body of the capacitor can we assume is always 85°C?
I have to replace a few of 1980s capacitors (manufactured by ROE, Frako, and Philips), ...
- 105
1
vote
4
answers
2k
views
Can I substitute a capacitor with the same rated capacity and voltage but a lower inductance and higher rated ripple current for a mobo repair?
I have an early to mid 2000's motherboard that I am trying to restore. It looks to be mostly in good condition but a blown radial electrolytic capacitor might be causing trouble. From the placement of ...
- 21
0
votes
1
answer
217
views
ESR of aluminum electrolytic capacitors [closed]
Is there any way to calculate the ESR of electrolytic capacitors for high frequencies?
In aluminum electrolytic capacitor datasheets, the dissipation factor is given with low frequency(100Hz-120Hz) ...
- 319
2
votes
1
answer
326
views
Help identifying capacitors
The base of my my beloved robotic lawn mower has stopped working. It is the base that is the problem. If I unplug it for a while, then it will work for a few minutes, when I reconnect it.
I have ...
- 21
9
votes
4
answers
6k
views
Using capacitors as a battery back-up
I have a device which is operated from a 12 VDC 10 A power supply and draws 8 A in operation.
I need to run this device for at least 20 seconds when the 12 V power supply is lost upon a power failure. ...
- 99
2
votes
3
answers
141
views
What is the result of wiring an electrolytic cap in series with a ceramic when parallel was intended?
FINAL UPDATE A reassessment of my power consumption has led me to the solution to all of my problems. I picked up a 5V, 5A power supply (giving me plenty of overhead), reassembled my project, and it ...
- 123
1
vote
2
answers
2k
views
Aluminum electrolytic vs. aluminum polymer capacitor
What type of capacitor should I use for a longer life (C8) aluminum electrolytic or aluminum polymer capacitor? It works at 400 kHz and must provide a current of 30 mA.
- 55