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Old 19th February 2013, 06:25 PM   #1
rif is offline rif  United States
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Default What is a .01 cd capacitor on a 1970s era schematic

I'm still learning here, so please bear with me.

I'm looking at a schematic published in the '70s. Around the +/- Vcc for an opamp, it has a capacitor connecting to ground, I assume for filtering. It's labelled ".01 cd". What is "cd"? I would have expected nF, pF etc...

Sorry, but I only have a hard copy. But I can say it's a straightforward opamp schematic.
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Old 19th February 2013, 06:31 PM   #2
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Sounds like a standard power supply bypass (a.k.a "decoupling") capacitor. The "CD" is probably an abbreviation for "ceramic disc". Nothing really special or critical about the part - ceramic discs were probably the cheapest component available at the time with that capacitance.

Dale
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Old 19th February 2013, 06:34 PM   #3
Mooly is offline Mooly  United Kingdom
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It would be 0.01uf (=10nf) and function as Dale mentioned. Would have to see it to be 100% sure but if its from rail to ground then its as described.
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Old 24th February 2013, 03:15 PM   #4
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Ceramic disc for sure.
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