Shiawassee Amateur Radio Association ~ W8QQQ
Whiskey 8 Quack Quack Quack
James P. Capitan Center, Lower Level; 149 E. Corunna Ave.; Corunna, MI 48817
Our ham station is located in Grid Square EN72wx at the EOC Center for James P. Capitan Center, Lower Level.
Latitude: 42.9819 N Longitude: -84.1164 W Alitude: 760 ft
Capacitor Markings (Ceramic & Monolithic Caps)
IMPORTANT: Values below 100 pF maybe marked in two ways: Two digits (ex: '22' = 22 pF; '47' = 47 pF) OR three digits (ex: '220' = 22 pF; '221' = 220 pF; '222' = 2200 pF) where the third digit is the number of zeros following the first two digits.
|1pF; 2pF; 5pF||1; 3; 5||
2.7pF, 3pF or 3.3pF are interchangeable
4.7 or 5 pF are interchangeable
|10 pF||10 or 100||0.001 uF||102||0.10 uF||104|
|12 pF||12 or 120||0.0012 uF||122||0.12 uF||124|
|15 pF||15 or 150||0.0015 uF||152||0.15 uF||154|
|18 pF||18 or 180||0.0018 uF||182||0.18 uF||184|
|22 pF||22 or 220||0.0022 uF)||222||0.22 uF||224|
|27 pF||27 or 270||0.0027 uF||272||0.27 uF||274|
|33 pF||33 or 330||0.0033uF||332||0.33 uF||334|
|39 pF||39 or 390||0.0039uF||392||0.39 uF||394|
|47 pF||47 or 470||0.0047uF||472||0.47 uF||474|
|58 pF||58 or 580||0.0056 uF||562||0.56 uF||564|
|68 pF||68 or 680||0.0068 uF||682||0.68 uF||684|
|82 pF||82 or 820||0.0082 uF||822||0.82 uF||824|
|100 pF||101||0.01 uF||103||1.0 uF||105 or 1 uF|
|120 pF||121||0.012 uF||123|
|150 pF||151||0.015 uF||153|
|180 pF||181||0.018 uF||183|
|220 pF||221||0.022 uF||223|
|270 pF||271||0.027 uF||273|
|330 pF||331||0.033 uF||333|
|390 pF||391||0.039 uF||393|
|470 pF||471||0.047 uF||473|
|560 pF||561||0.056 uF||563|
|680 pF||681||0.068 uF||683|
|820 pF||821||0.082 uF||823|
Temperature stable capacitors are usually marked "NPO", "COG" or monolyth may have a 'Black' top.
Performance ratings from CDE Cornell Dubilier are typical of what you can expect from disc ceramics - CDE Performance.
Capacitor ThoughtsSooner or later you will wish to build/repair a piece of equipment that uses capacitors. So what do you really need to know about a physical capacitor and how do you test one? Physical size may be one of your factors, but that is assumed correct, so waht about the electrical needs? There are 'ratings' usually marked on a physical capacitor... observe and follow these. Working voltage needs to be equal or higher then the circuit voltage. You can use a meter to measure the actual part capacitance... make sure it close (with-in tolerance) of your desired value. Using a different meter, yoiu can measure the Equivalent Series Resistance [ESR] for your capacitor. The meter uses aa audio frequency alternating current / voltage in it's circuit to test the series connected resistance for your capacitor. It need to be 'low' for the particular capacitance value of ther device. 'High' is BAD. If it is high, pitch it and keep looking for a valid device. Next worry is the 'leakage current value', again another meter can check for leakage resistance at the proper voltage for your capacitor. Here, 'high leakage' is BAD, again if it does not show good, pitch the capacitor. If you know the values are indeed good, then you can use it in your circuit. If any one of these bad you do NOT want that device in your circuit. So using capacitors of any type means you need to know that the four items are okay.
- Working Voltage
- Capacitance Value
- Leakage Current