The 16 volt 100uf electrolytic capacitor is connected to 12 volt DC, but the power supply polarity c

The 16 volt 100uf electrolytic capacitor is connected to the 12 volt DC power supply, but the polarity is reversed, and the capacitor will heat up and damage quickly.

Let's take a look at electrolytic capacitors.

Electrolytic capacitor is a type of capacitor, the metal foil is the positive electrode (aluminum or tantalum), the oxide film (aluminum oxide or tantalum pentoxide) that adheres to the metal with the positive electrode is the dielectric, and the cathode is composed of conductive materials, electrolyte (the electrolyte can be liquid or solid) and other materials, because the electrolyte is the main part of the cathode, the electrolytic capacitor is therefore named. At the same time, the positive and negative electrolytic capacitors cannot be connected wrong. Aluminum electrolytic capacitors can be divided into four categories:

Leaded aluminum electrolytic capacitors;Horn type aluminum electrolytic capacitors;Bolt-on aluminum electrolytic capacitors;Solid aluminum electrolytic capacitors.

Capacitive principle. Electrolytic capacitors are usually made of metal foil (aluminum-tantalum) as the positive electrode, and the insulating oxide layer of the metal foil (alumina-tantalum pentoxide) as the dielectric, and electrolytic capacitors are divided into aluminum electrolytic capacitors and tantalum electrolytic capacitors with their positive electrodes. The negative electrode of an aluminum electrolytic capacitor consists of a thin paper film or an electrolyte polymer soaked in an electrolyte liquid (liquid electrolyte).The negative electrode of tantalum electrolytic capacitors is usually manganese dioxide.

Since the electrolyte is used as the negative electrode (note the distinction from the dielectric), the electrolytic capacitor gets its name.

Capacitive applications. Polarized electrolytic capacitors are usually used in power supply circuits or medium frequency and low frequency circuits to play the role of power supply filtering, decoupling, signal coupling, time constant setting, and DC blocking. Generally, it can not be used for AC power supply circuit, when used as a filter capacitor in DC power supply circuit, its anode (positive pole) should be connected with the positive terminal of the power supply voltage, and the cathode (negative pole) should be connected with the negative terminal of the power supply voltage, and cannot be reversed, otherwise the capacitor will be damaged.

Hermaphroditic electrolytic capacitors are commonly used in speaker crossover circuits, TV S-correction circuits, and starting circuits of single-phase motors.

Electrolytic capacitors are widely used in household appliances and various electronic products, and their capacitance range is large, generally 1 33000 F, and the rated working voltage range is. Its disadvantages are that the dielectric loss, the capacity error is large (the maximum allowable deviation is +100%, -20%), the high temperature resistance is poor, and the storage time is long and easy to fail.

The polarity of the electrolytic capacitor, pay attention to the side of the electrolytic capacitor with "-" is the negative pole, "+ is the positive pole, if the electrolytic capacitor is not marked with the positive and negative poles, it can also be judged according to the length of its pins, the long leg is the positive pole, and the short leg is the negative pole.

The structure of the electrolyte capacitor is different from the general mica capacitor in that it is divided into positive and negative electrodes, so that although the voltage you add is not high, it does not exceed its rated voltage, but because the polarity is opposite, so that with the passage of time, the inverting charge accumulates more and more, and it is easy to reverse breakdown and burn out or even occur, causing damage to the circuit board.

The electrolytic capacitor is reversed, the electrolytic capacitor is very easy to be damaged, and the capacitor will be ** (large capacity and large power supply current) in serious cases.

The electrolytic capacitor has a positive and negative pole, only the positive pole can be connected to the positive pole of the power supply, and the negative pole is connected to the negative pole of the power supply. Of course it will be damaged.

16V is a bit small, it is best to use 25V, and the volume and ** are not much different. If the positive and negative poles are reversed, it will be **.

If you are replacing the capacitor, make sure that the voltage level of the new capacitor (16V) is greater than or equal to the voltage level of the original capacitor (25V). In this case, you can replace the 25V 100UF electrolytic capacitor with a 16V 100UF electrolytic capacitor. Note that the capacitance of the capacitor (100uf) should be the same as the capacitance of the original capacitor.

If you use a different capacitor capacitance, it may affect the performance of the circuit.

Can a 25V100UF electrolytic capacitor use 16V1000UF?

If you are replacing a capacitor, make sure that the voltage of the new capacitor is equal to the voltage level (16V) of the original capacitor (25V). In this case, you can replace the 25V 100UF electrolytic capacitor with a 16V 100UF electrolytic capacitor. Note that the capacitance of the capacitor (100uf) should be the same as the capacitance of the original capacitor.

If you use a different capacitance capacitance, it may affect the performance of your circuit.

Dear, the following are related extensions, I hope it will be helpful to you<>

Regarding capacitance, it is a device that stores electrical charge and usually consists of an insulating medium between two conductors. When the capacitor is powered on, the bridge charge accumulates between the two pre-conductor bodies, causing the capacitor to become electrified. The electrical capacity of a capacitor depends on the distance between the two conductors and the dielectric constant of the medium.

The unit of a capacitor is farad (f), which indicates the amount of charge that can be stored when a capacitor is charged with a voltage of 1 volt. Capacitors have a wide range of applications in electronics, communications, energy storage, and other fields. <>

Hello dear! I'm Xiao Guo, and I'm glad to answer for you! No, the capacitance and voltage of the capacitor are both very important, and if the capacitance is the same, but the voltage is different, it cannot be directly replaced.

In general, the voltage of the capacitor should be slightly higher than the highest voltage in the actual circuit. Therefore, if you need to use a 25V100UF electrolytic capacitor in your circuit, then you should not replace it with a 16V1000UF capacitor. If you use a sock or sell a capacitor with a voltage lower than the required voltage, this will force the capacitors to be forced by the voltage, causing them to fail prematurely.

To avoid this, you need to use a capacitor that matches the voltage required by the circuit. Therefore, it is recommended that you do not use capacitors with different specifications interchangeably, so as not to affect the normal operation of the circuit or the life of the capacitor. Kiss!

If I've helped you, please give me a thumbs up! Thanks!

Summary. This is because the voltage capacity of the capacitor must be greater than or equal to the voltage required in the circuit, otherwise the capacitor will burn out or damage other electronic components. In this case, the capacitance of the 25V 100UF electrolytic capacitor is 2500 μf, while the capacitance of the 16V 1000UF is 16000 μf, and the voltage capacitance does not match.

Therefore, 16V 1000UF cannot be used instead of 25V 100UF electrolytic capacitors.

Hello according to your problem description: 25V100UF electrolytic capacitor can not use 16V1000UF

This is because the voltage capacity of the capacitor must be greater than or equal to the voltage required in the circuit, otherwise the capacitor will burn out or damage other electronic components. In this case, the capacitance of the 25V 100UF electrolytic capacitor is 2500 μF, while the capacitance of the 16V 1000UF is 16000 μF, and the voltage capacity does not match. Therefore, 16V 1000UF cannot be used instead of 25V 100UF electrolytic defense pin capacitors.

Look at your capacitor to know that it is a filter capacitor, there is no problem, the principle of replacement is that the voltage should be high or equal, and the capacity should be greater than or equal to (filtering can, other applications can't, it must be consistent) The temperature is of course high, and the cost can be high.

The above premise is that if there is only one capacitor in series, it will not work if it is connected in series or parallel.

This is not possible for three reasons:

2. The capacity of the capacitor is more than twice the original, which will cause the relevant parameters of the circuit to change, so that the circuit parameters do not meet the requirements of the electrical appliances, resulting in damage to the electrical appliances or circuit originals.

3. The increase of capacitance capacity will lead to an increase in the volume of capacitance, and the capacitor may not be installed normally on the circuit board.

Yes, it is best to replace the switch (adjustment tube) with a larger current.

If it is a filter capacitor, it is perfectly fine, because the larger the capacity of the filter capacitor, the better the filtering effect. If it is used in the circuit is Brexit capacitor, bypass capacitor, etc., it cannot be replaced. For example, the following picture:

The capacity of C1 in the figure cannot be increased or decreased.

It has to do with the structure of your circuit and the conditions of use.

1. Filtering and voltage stabilization must be rectified first, and cannot be used under AC.

2 Usually 1000UF 25V capacitor is damaged by several factors: overvoltage, reverse connection, overheating (other components overheat to bake it hot).

3 7812 itself with overcurrent, overheating protection, it is bad The possibility is: overvoltage, the output voltage is higher than the input voltage, component quality problems (there is a problem with the quality of the components, and then the overcurrent is encountered, and the overheating will be broken) The maximum input voltage of 7812 is 35V, and your AC should consider whether the peak value exceeds 35V, otherwise the 7812 will be damaged, and the capacitor will be damaged by overvoltage after the 7812 breakdown.

The 1000UF 25 electrolytic capacitor 7812 is a DC device and cannot be used in AC. You need to add a rectifier bridge behind the 12V AC current, then connect the electrolytic capacitor, and then connect the 7812 voltage to direct current.

It is used as a filter circuit in an AC 12V circuit"

Is there a mistake in the description, if the 7812, filter capacitor works in an unrectified circuit, it must be bad.

If the circuit is indeed DC, it is likely that the voltage is too high, check it.

Used in AC 12V circuits, bad is normal!

Aluminum electrolysis is a polar capacitor and cannot be used in AC resistance, which is the minimum common sense of application!

Reverse voltage is usually not allowed, except at the moment of power on/off, load jump, etc., but not more than 1V!

It can be replaced, and the current ceramic chip capacitors in the industry.

The capacity can be done: 16V-47UF, 25V-22UF level!

Although it can't do 16V-100UF, because the impedance of Juega ceramics is much smaller, it does not need capacitors of the same capacity to replace aluminum electrolysis, and the same filtering effect can still be achieved!

The advantage of replacement is that it can save volume, and the disadvantage is that the cost is not cheap, 25V-47UF (yuan), 16V-22UF (yuan), ordinary aluminum electric lifting solution: 25V-100UF (yuan), SMD aluminum electrolysis and laughing pie: 25V-100UF (yuan).

Through the comparison of ** and other aspects, it is recommended to consider using SMD aluminum capacitors or not making changes! After all, there is an advantage in cost!

The withstand voltage of the chip capacitor can be achieved, but it cannot be replaced because the reputation and confidence are difficult to meet. Secondly, the chip electric suspicion of the virtual plexus capacity and the electrolytic capacitor have different distances between the lead and the pinch of the skura, which is inconvenient for welding.

There are two failure modes for capacitors:

1) Breakdown short circuit, which should always maintain a small resistance when measuring in ohms;

2) Burn out the circuit breaker, which should directly maintain the infinity resistance value when measuring with ohmics.

In general, there are several reasons for capacitor burnout:

1) Burning caused by insufficient withstand voltage and overpressure;

2) Burn-out caused by exceeding the maximum working current;

3) Burning caused by exceeding the maximum operating temperature;

4) Burn-out caused by frequency mismatch and over-loss;

5) Capacitor burnout caused by electrolyte drying up.

Generally speaking, capacitor overvoltage is the most likely, and once this happens, it is best to use a capacitor with a higher withstand voltage instead.

If the filter capacitor can be replaced with a larger capacitance, or with the same capacitance but with a higher withstand voltage.