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 4 hours ago
Pier-Yves Lessard
29528
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 4 hours ago
Pier-Yves Lessard
29528
Is there a materials list that calls out the actual part numbers for these capacitors?
– The Photon
4 hours ago
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 4 hours ago
Pier-Yves Lessard
29528
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 4 hours ago
Pier-Yves Lessard
29528
asked 4 hours ago
Pier-Yves Lessard
29528
asked 4 hours ago
Pier-Yves Lessard
29528
asked 4 hours ago
Pier-Yves Lessard
29528
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
4 hours ago
add a comment |
Is there a materials list that calls out the actual part numbers for these capacitors?
– The Photon
4 hours ago
Is there a materials list that calls out the actual part numbers for these capacitors?
– The Photon
4 hours ago
Is there a materials list that calls out the actual part numbers for these capacitors?
– The Photon
4 hours ago
add a comment |
1 Answer
1
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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 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.
answered 4 hours ago
The Photon
83.3k396194
Yes, you are right. I missed that.
– Pier-Yves Lessard
3 hours ago
add a comment |
Your Answer
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active
oldest
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oldest
votes
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.
answered 4 hours ago
The Photon
83.3k396194
Yes, you are right. I missed that.
– Pier-Yves Lessard
3 hours ago
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 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.
answered 4 hours ago
The Photon
83.3k396194
Yes, you are right. I missed that.
– Pier-Yves Lessard
3 hours ago
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 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.
answered 4 hours ago
The Photon
83.3k396194
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.
answered 4 hours ago
The Photon
83.3k396194
answered 4 hours ago
The Photon
83.3k396194
answered 4 hours ago
The Photon
83.3k396194
answered 4 hours ago
The Photon
83.3k396194
83.3k396194
Yes, you are right. I missed that.
– Pier-Yves Lessard
3 hours ago
add a comment |
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
add a comment |
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Is there a materials list that calls out the actual part numbers for these capacitors?
– The Photon
4 hours ago