how to read old schematic capacitors??

Olegarich · Mar 31, 2019

I'm looking for a schematic of an old TV and capacitor are marked traditionally but instead of capacitance value uf, nf or pf - there is 22K, 47K, 10K - jsut like resistors, but those are capacitors and tthey marked like C1 - 10K, C2 - 47K. Why? and how to read that?

volker · Mar 31, 2019

The k is still a thousand multiplier, with the base size pF. So 22k is 22000pF, is 22nF. But the surrounding circuitry should tell you what a reasonable value would be.

Olegarich · Mar 31, 2019

thanks!!!

moamps · Mar 31, 2019

K most probably means tolerance (10%)
47k is 47pF, 10%

Third number is number of zeroes.
471 is 470pF, 223 is 22000 pF or 22nF and so on.

Rob Flinn · Mar 31, 2019

moamps said:
K most probably means tolerance (10%)
47k is 47pF, 10%

I think k means 1000. i.e 47K = 47,000pF or 47nF

moamps · Mar 31, 2019

You are right, I was wrong. If k is marking on the schematic it means x1000.
But I never saw it on a capacitor symbol.

JMFahey · Apr 3, 2019

"K" as an indicator of tolerance, same as "R" , "J" , etc, "is a modern thing" , way back then they were happy just indicating part value, and 20% tolerance was implicit, unless specifically noted otherwise.

10% was above normal and 5% was premium.

1% stuff? only inside Tektronik or Hewlett Packard Lab equipment, go figure.

In a way, a simpler life

how to read old schematic capacitors??

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