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I need a filter capacitor for a Knight KG-250 integrated amp. It has six leads-six different capacitances provided-I need it to get rid of an awful hum. Do I stand a chance of finding one or shall I junk it? It is a sweet old unit, and cosmetically in fine shape.

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Would you be able to post the capacitance's and the voltage ratings?
If you are not able to find the one with the 6 leads, you can try to find them individually and that should work just fine.

Posted on Nov 30, 2008

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1 Answer

How do I reconnect the capacitor?


Not easy to explain. The capacitor is split, it has two values, or like two capacitors connected internally with a center tap between them. Two capacitance values, maybe 5uf and 20uf, the lower value for the fan motor and the higher for the compressor, with terminals C-common, F-fan, M-compressor.
Capacitor terminal C is the center tap and that takes 3 connections, line (power) - fan line common to capacitor, and Compressor line common to capacitor. Notice the fan and compressor have a power line not common to capacitor, just power line.
Capacitor terminal F has one wire connecting to Fan terminal C, fan may have three or four terminal writes, two for power with one power being common to capacitor connection and the other power alone, two power connection wire leads. Fan motor third line is capacitor, connects to the capacitor alone. Four wire configuration fan motor is not likely your needs. Omit or ask again for further explanation.
Compressor is similar to fan, only with a capacitance value higher than for tha fan motor. Two power leads, one straight power, the other power lead connects to the capacitor power. The third compressor lead connects alone to the capacitor.
The with is to draw a diagram and level the colors of each lead and terminal lavels too. The motors nameplate may indicate wire color code, the a-c nameplate wiring diagram may be present in the control wron wiring compartment, the goal is to find clues or to trace each wire and verify what they connect or do, take notes on your drawing.
Basically the motor has three terminals, L1 - L2 - C, or C- S-R (Common, Start,Run)

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1 Answer

On a rainbow d4c there is what looks like a capacitor. it is mounted close to the power nozzel recepical. it has two wire attached to it. I need a new one but haven't been able to locate. Can someone


Does the power nozzle have a motor in it. If it does the capacitor is probably an interference suppressor type. Is it a square / oblong cap with 2 leads? If it is then you need to look at it and find the capacitance value and the voltage. In the UK it is something like 0.1uF / 250 Volt (or higher). Some have 3 leads, 2 go to the motor power leads and the other is an earth connection. If it's a cylinder type then it will probably be either a mains filter cap or a motor start cap. Either way you should be able to get one from electronic component suppliers or even Ebay. As long as you can get the info off the original cap.

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WHAT IS THE COEFFIIENT OF FRICTION?


250 kg is sitting on a horizontal surface. Hence, the ground or the horizontal surface is exerting 250 * 9.8 = 2450 N to support the crate. Now, coeff is 750/2450 = 0.306 . The force you have to exert to move crate depends on how heavy the crate is. If crate is heavy you will end up exerting more force. The ratio of the forces provide the coeff of friction.

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1 Answer

Can i use 10nf3k ceramic capacitor to replace10pf3k ?


Hi Max,

Ceramic types are often found at the low range of capacitive values and electrolytic types are are the high end of capacitive values. Ceramic and electrolytic caps do certain jobs better when of one design instead of the other. The capacitive values may be the same, but there are other qualities that don't get printed on the part. One of the most noticeable differences is that electrolytic types don't do a very good job passing radio frequencies (RF). You'll often see several ceramic types in parallel (if needed) to get the correct amount of capacitance when a single electrolytic would appear to do the job in an circuit where the frequency is in the RF range. Audio Frequencies (AF) on the other hand are significantly lower and do not pose the same problem. There are other types of caps and they each have situations where they would do the best job.

In short, the developer / manufacturer selects all the parts based on a wide range of variables he needs to control based on design and testing. You should always replace components with like components, otherwise you risk adverse reaction(s) from one of those variables that had originally been contained.

Click the link below for some basic info about caps:

http://dev.emcelettronica.com/guide-to-capacitors-electrolytic-capacitor-ceramic-capacitor-and-others

I hope this was helpful & good luck!

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The "Aw, Snap" screen is an error message displayed when the Chrome browser crashes. It may indicate that your Chrome installation has been corrupted, or some malware/virus in your computer.

See this Chrome help page on steps you should take to address that problem:
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1 Answer

A/C unit fan doesn't run.


Check the fan capacitor.
  1. Using a multimeter to check a capacitor
    Plug the red lead into the positive port of the multimeter. Plug the black lead into the negative port of the multimeter. On some multimeter's the negative port is labeled "common." The other ends of the leads have alligator clips attached to them.
  2. Turn on power to the multimeter. Change the measurement dial to the microfarad capacitive setting.
  3. 3 Connect the black alligator clip to the negative lead of the oil-filled capacitor. Connect the red alligator clip to the positive lead of the oil-filled capacitor. The capacitance, in microfarads, of the oil-filled capacitor is displayed on the multimeter screen. If this reading is 0 or differs from the capacitance written on the capacitor's casing by more than 5 percent, replace the oil-filled capacitor.

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1 Answer

My beaitiful Knight KG 250 amp has a loudly humming 6 lead filter cap. Can I ever find a replacement? This amp had a wonderful, rich tone. Thanks, Floydian


Try to search for "filter capacitor" at www.ebay.com

I did a search and found some. Look for the value of your current filter caps and find capacitors with the same value.

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2 Answers

Lights dimming


Your lights are dimming because your system is pulling too much current from your car. Your battery provides long-term sustained power, but your system wants to draw power faster than your alternator and battery can provide it. When the amp attempts to draw more amperage than the battery and alternator can produce, it creates a voltage differential in your system, which attempts to steal electricity from the rest of your system (like your lights). The most common solution for lights dimming is to add some level of adequate capacitance to your car. Capacitors store electricity and deliver it quickly to your amps as needed. Capacitors resist voltage changes by producing large amounts of amperage. This means that the capacitor(s) will provide the electrical bursts that your amps want so that it doesn't have to steal it from your lights. You can start out with 1.0 Farad, if the problem doesn't go away, add another one, and so on until the problem is gone. You cannot have too much capacitance, it's just an electrical buffer for your audio system.

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Easy fix. Wipe the capacitance sensing metal stripes located right below the inside of the filter. Make sure the 2 metal stipes are very clean. This measures the capacitance of the clothes and constantly records differences till the clothes are dry.if **** is on these then you would have failure. Porvavor.

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