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# What is this component?

I recently took up an interest in selling kits for my instructable "The Light Theremin." However upon ordering the exact parts I realized I still don't know what type of capacitor I used! When I built it I assumed from its size that it was 1.0uF, and judging from the lack of complaints on the instructable I must be somewhat right. Here is all the information i know and can provide...

- its marked "104" on one side

- It is a ceramic disk capacitor.

- light brown in color.

- and seems to work well in an experiment around 9 volts direct current.

Here is a link to my instructable: https://www.instructables.com/id/Light-Theremin/

Thank You!

## Discussions

7 years ago

Thank you all for your help!

Best Answer 7 years ago

See AndyGadget's link, or the Wikipedia article on capacitor markings. The three-digit codes are a compact "exponential notation:"

xyz== (xy) × 10^{z}, with a base unit of picofarads (pF).Your capacitor is marked "104", which becomes 10 × 10

^{4}= 10 × 10000 = 100,000 pF = 0.1 µF.7 years ago

I do believe you are correct, 104 = 1.0x10^4 nF = 1000 nF = 1uF

Answer 7 years ago

You've dropped two zeros and added three :-) The first two digits are the mantissa, so "104" actually means 10 × 10

^{4}, or 100,000 (not 1,000). Also, the base unit for those three-digit codes is pF, not nF. The net result is 0.1 µF.Answer 7 years ago

I knew someone would jump in :) I thought the 2 digits was 1 and 1 of precision...good to know :)

7 years ago

100nF, 0.1uF

Steve

7 years ago

It's a 0.1uF capacitor. Here's a table to help.