Audio filtering circuit with capacitor shorted












2














I was looking at the Adafruit FONA cellular network modem breakout board schematic and found something that I can't quite understand. The breakout board has an audio input and output that both goes into the SIM5320A modem through a filter.



I found the audio filter quite strange as there is 2 capacitors where both terminals are connected together. See circled components



What is the purpose of such design?



enter image description here






audio modem filtering







share|improve this question






















  • Is there a materials list that calls out the actual part numbers for these capacitors?
    – The Photon
    3 hours ago
















2














I was looking at the Adafruit FONA cellular network modem breakout board schematic and found something that I can't quite understand. The breakout board has an audio input and output that both goes into the SIM5320A modem through a filter.



I found the audio filter quite strange as there is 2 capacitors where both terminals are connected together. See circled components



What is the purpose of such design?



enter image description here






audio modem filtering







share|improve this question






















  • Is there a materials list that calls out the actual part numbers for these capacitors?
    – The Photon
    3 hours ago














2












2








2







I was looking at the Adafruit FONA cellular network modem breakout board schematic and found something that I can't quite understand. The breakout board has an audio input and output that both goes into the SIM5320A modem through a filter.



I found the audio filter quite strange as there is 2 capacitors where both terminals are connected together. See circled components



What is the purpose of such design?



enter image description here






audio modem filtering







share|improve this question













I was looking at the Adafruit FONA cellular network modem breakout board schematic and found something that I can't quite understand. The breakout board has an audio input and output that both goes into the SIM5320A modem through a filter.



I found the audio filter quite strange as there is 2 capacitors where both terminals are connected together. See circled components



What is the purpose of such design?



enter image description here






audio modem filtering




audio modem filtering






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked 4 hours ago









Pier-Yves Lessard

29528




29528












  • Is there a materials list that calls out the actual part numbers for these capacitors?
    – The Photon
    3 hours ago


















  • Is there a materials list that calls out the actual part numbers for these capacitors?
    – The Photon
    3 hours ago
















Is there a materials list that calls out the actual part numbers for these capacitors?
– The Photon
3 hours ago




Is there a materials list that calls out the actual part numbers for these capacitors?
– The Photon
3 hours ago










1 Answer
1






active

oldest

votes


















4














Notice the designators are C14A, C14B, C14C, etc.



This likely indicates these capacitors are all part of a single capacitor array component. If the array the designer selected has too more individual capacitors than are actually needed, then shorting the unused ones avoids the possibility of static charge building up on them.



If you look at the physical layout it's likely you'll see the traces are arranged to make it easy to use cuts and jumps to re-connect those capacitors to the circuit.






share|improve this answer





















  • Yes, you are right. I missed that.
    – Pier-Yves Lessard
    3 hours ago











Your Answer





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1 Answer
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active

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1 Answer
1






active

oldest

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active

oldest

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active

oldest

votes









4














Notice the designators are C14A, C14B, C14C, etc.



This likely indicates these capacitors are all part of a single capacitor array component. If the array the designer selected has too more individual capacitors than are actually needed, then shorting the unused ones avoids the possibility of static charge building up on them.



If you look at the physical layout it's likely you'll see the traces are arranged to make it easy to use cuts and jumps to re-connect those capacitors to the circuit.






share|improve this answer





















  • Yes, you are right. I missed that.
    – Pier-Yves Lessard
    3 hours ago
















4














Notice the designators are C14A, C14B, C14C, etc.



This likely indicates these capacitors are all part of a single capacitor array component. If the array the designer selected has too more individual capacitors than are actually needed, then shorting the unused ones avoids the possibility of static charge building up on them.



If you look at the physical layout it's likely you'll see the traces are arranged to make it easy to use cuts and jumps to re-connect those capacitors to the circuit.






share|improve this answer





















  • Yes, you are right. I missed that.
    – Pier-Yves Lessard
    3 hours ago














4












4








4






Notice the designators are C14A, C14B, C14C, etc.



This likely indicates these capacitors are all part of a single capacitor array component. If the array the designer selected has too more individual capacitors than are actually needed, then shorting the unused ones avoids the possibility of static charge building up on them.



If you look at the physical layout it's likely you'll see the traces are arranged to make it easy to use cuts and jumps to re-connect those capacitors to the circuit.






share|improve this answer












Notice the designators are C14A, C14B, C14C, etc.



This likely indicates these capacitors are all part of a single capacitor array component. If the array the designer selected has too more individual capacitors than are actually needed, then shorting the unused ones avoids the possibility of static charge building up on them.



If you look at the physical layout it's likely you'll see the traces are arranged to make it easy to use cuts and jumps to re-connect those capacitors to the circuit.







share|improve this answer












share|improve this answer



share|improve this answer










answered 3 hours ago









The Photon

83.3k396194




83.3k396194












  • Yes, you are right. I missed that.
    – Pier-Yves Lessard
    3 hours ago


















  • Yes, you are right. I missed that.
    – Pier-Yves Lessard
    3 hours ago
















Yes, you are right. I missed that.
– Pier-Yves Lessard
3 hours ago




Yes, you are right. I missed that.
– Pier-Yves Lessard
3 hours ago


















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