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 Post subject: Is this a capacitor?
PostPosted: Dec Sat 02, 2017 4:31 am 
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 Post subject: Re: Is this a capacitor?
PostPosted: Dec Sat 02, 2017 5:07 am 
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Location: Syracuse NY
It is a 3.3 PFD ceramic cap. As long as it's not physically damaged, it should be fine.

Bob

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 Post subject: Re: Is this a capacitor?
PostPosted: Dec Sat 02, 2017 5:37 am 
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That's one type of tubular ceramic cap.
Those were available in extremely small values, including <1.0 pfd.
Guaranteed to be good unless broken.

- Leigh

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 Post subject: Re: Is this a capacitor?
PostPosted: Dec Sat 02, 2017 4:37 pm 
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Joined: Jan Mon 16, 2017 3:08 am
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Location: Boise, Idaho
Thanks for confirming what my meter was telling me. At first I thought it was a funky resistor until I put leads to it and got no reading

It may be the source of a ticking I am trying to track down At the very least it is part of the circuit that's ticking because when I pushed on it with the tip of a paint brush the ticking went away and now with one end removed the ticking is not there anymore.

Thanks.


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 Post subject: Re: Is this a capacitor?
PostPosted: Dec Sat 02, 2017 6:57 pm 
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If you put a x10 scope probe on one or the other side of it what sort of signal is present on the part, I would wonder. Then for bonus points, nudge it with your stick. Does it change the trace on the scope? Could be that it's a part on the edge of failure, or perhaps there's just a cyclical spike at this point in the circuit that's causing the cap to chirp in a sort of piezoelectric manner.

- Scott


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 Post subject: Re: Is this a capacitor?
PostPosted: Dec Sat 02, 2017 10:43 pm 
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Joined: Jan Mon 16, 2017 3:08 am
Posts: 157
Location: Boise, Idaho
flanneltuba wrote:
If you put a x10 scope probe on one or the other side of it what sort of signal is present on the part, I would wonder. Then for bonus points, nudge it with your stick. Does it change the trace on the scope? Could be that it's a part on the edge of failure, or perhaps there's just a cyclical spike at this point in the circuit that's causing the cap to chirp in a sort of piezoelectric manner.

- Scott


Further testing this morning would indicate it's not the problem after all. Removing it from the circuit simply shifted the frequency of the problem. By adjusting the pa plate capacitor the noise came back.


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