Capacitor working voltage codes. The working voltage for a capacitor is very important and therefore this parameter is often marked on capacitors and particularly in situations where there is space for alphanumeric coding.
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The numbers are read from left to right with the extra wide space being on the right you cant always go by the outer foil nipple.
How to read vintage capacitors. A capacitor might look ok when testing with an ohmmeter yet leak like crazy when enough voltage is applied. That function can tell you the capacitance value of a modern low voltage capacitor but its useless for checking vintage capacitors. Physically small capacitors are especially difficult to read due to the limited space available for printing.
How to read a capacitor. Editor if you are new to restoring antique tube radios here are some useful capacitor tips. The can styles are large enough t.
So the capacitor below is 22000 pf 10 1500 volts dc. In many instances where the capacitor is small no voltage coding is provided and care must be taken when using a capacitor without any knowledge of its working voltage. In this instructible i will try to explain the markings on capacitors and how to determine the values.
The same is true of modern multimeters with a capacitor test function. The color dots must be read in the correct sequence a b c from left to right in order to correctly interpert the color code. Note that the tolerance and voltage codes may not be exactly the same as used by other companies or other capacitor types.
This is a good thing for me as the ones that were given to me are pretty old new stock. It has very predictable temperature coefficients tcs and in general does not age with time. The can style flat disc and bead styles.
A npo ceramic capacitor is an ultrastable or temperature compensating capacitor. It is one of the most highly stable capacitors. When youre in the midst of a repair job dave cantelons simplified capacitor tips should be helpful.
Unlike resistors capacitors use a wide variety of codes to describe their characteristics. Capacitors can be puzzling to someone new to radio repair. In order to make certain that the capacitor will be held in the proper position while the dots are being read manufacturers have adopted several 3 dot marking arrangements.
Capacitor tips for the beginner. Firstly there are a few different styles of capacitor packages.
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