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Question Capacitor Voltage?

 
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Last Post by WaveyDipole 3 weeks ago
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crustytv
 crustytv
(@crustytv)
Posts: 12242
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OK here's one for you, I have a batch of these, capacitors, I'm trying to ascertain the rated voltage. The code on the cap is as follows:-

A50     - is this the voltage 50V?
472M  -clearly the code for 4700pF/4.7nF/.0047uF
C929  - no idea

Any ideas on the voltage front?

20240917 073740[1]

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Posted : 17/09/2024 6:45 am
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Capacitor Voltage
Forum 136
 irob2345
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I would guess 50 volts but there is an easy, non-destructive way to find out.

Obtain a source of about 500 volts - TV B+Boost?

Connect a 1M resistor and the cap in series.

Put a (high impedance) meter across the cap.

Switch on.

See what the voltage goes up to.

Halve it to get your safe working voltage.

 
Posted : 17/09/2024 8:31 am
crustytv
 crustytv
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👍Thanks Ian, I'll try that, my bridge can supply up to 500V.

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Posted : 17/09/2024 8:53 am
Boater Sam
 Boater Sam
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I have some similar small caps in various values, not with those number. They are all 50v rated however.

Boater Sam

 
Posted : 17/09/2024 4:07 pm
WaveyDipole
 WaveyDipole
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That seems to be a reasonable assumption.

A - axial 

50 - 50Vdc

472 - 4700pF or 4.7nF

M - tolerance 20%

C929 - also no idea. Perhaps manfacturers batch code or something.

Interesting measurement technique. I presume that's still putting excessive voltage across the dielectric though, all be it with limited current?

 
Posted : 18/09/2024 2:00 pm
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