Audio filtering circuit with capacitor shorted
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?
audio modem filtering
asked yesterday
Pier-Yves Lessard
30528
add a comment |
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?
audio modem filtering
asked yesterday
Pier-Yves Lessard
30528
Is there a materials list that calls out the actual part numbers for these capacitors?
– The Photon
yesterday
add a comment |
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?
audio modem filtering
asked yesterday
Pier-Yves Lessard
30528
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?
audio modem filtering
audio modem filtering
asked yesterday
Pier-Yves Lessard
30528
asked yesterday
Pier-Yves Lessard
30528
asked yesterday
Pier-Yves Lessard
30528
asked yesterday
Pier-Yves Lessard
30528
asked yesterday
Pier-Yves Lessard
30528
30528
Is there a materials list that calls out the actual part numbers for these capacitors?
– The Photon
yesterday
add a comment |
Is there a materials list that calls out the actual part numbers for these capacitors?
– The Photon
yesterday
Is there a materials list that calls out the actual part numbers for these capacitors?
– The Photon
yesterday
Is there a materials list that calls out the actual part numbers for these capacitors?
– The Photon
yesterday
add a comment |
1 Answer
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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 many 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.
edited 20 hours ago
jusaca
54137
answered yesterday
The Photon
83.4k396194
Yes, you are right. I missed that.
– Pier-Yves Lessard
yesterday
add a comment |
Your Answer
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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 many 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.
edited 20 hours ago
jusaca
54137
answered yesterday
The Photon
83.4k396194
Yes, you are right. I missed that.
– Pier-Yves Lessard
yesterday
add a comment |
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 many 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.
edited 20 hours ago
jusaca
54137
answered yesterday
The Photon
83.4k396194
Yes, you are right. I missed that.
– Pier-Yves Lessard
yesterday
add a comment |
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 many 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.
edited 20 hours ago
jusaca
54137
answered yesterday
The Photon
83.4k396194
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 many 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.
edited 20 hours ago
jusaca
54137
answered yesterday
The Photon
83.4k396194
edited 20 hours ago
jusaca
54137
edited 20 hours ago
jusaca
54137
edited 20 hours ago
jusaca
54137
54137
answered yesterday
The Photon
83.4k396194
answered yesterday
The Photon
83.4k396194
answered yesterday
The Photon
83.4k396194
83.4k396194
Yes, you are right. I missed that.
– Pier-Yves Lessard
yesterday
add a comment |
Yes, you are right. I missed that.
– Pier-Yves Lessard
yesterday
Yes, you are right. I missed that.
– Pier-Yves Lessard
yesterday
Yes, you are right. I missed that.
– Pier-Yves Lessard
yesterday
add a comment |
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Is there a materials list that calls out the actual part numbers for these capacitors?
– The Photon
yesterday