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Schematic Help - Unknown Capacitors for raspberry pi project
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I'm recreating a raspberry pi project and ordered a custom pi hat to follow their schematic. The only issue is that it doesn't have all of the information. I've emailed the creator but am yet to hear a response.
The actual schematic:
http://www.smbaker.com/wordpress/wp-content/uploads/2018/03/piseeburg-schematic.jpg
And the board:
https://644db4de3505c40a0444-327723bce298e3ff5813fb42baeefbaa.ssl.cf1.rackcdn.com/d43e4bbeefd925914d29dc280e8d3a56.png
(The project is here: http://www.smbaker.com/converting-a-seeburg-3wa-wallbox-into-a-remote-for-a-modern-music-player)
I'm trying to figure out what the capacitances of C1, C2 and C7 are and where they go on the board as it's not very clear. Based on his photo of his final product, he didn't use one of those capacitors (I think it's C2). My guess is that C1 and C7 are the same.
Anyone out there to help?
capacitor
asked 4 hours ago
andiegoonie
61
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andiegoonie is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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up vote
1
down vote
favorite
I'm recreating a raspberry pi project and ordered a custom pi hat to follow their schematic. The only issue is that it doesn't have all of the information. I've emailed the creator but am yet to hear a response.
The actual schematic:
http://www.smbaker.com/wordpress/wp-content/uploads/2018/03/piseeburg-schematic.jpg
And the board:
https://644db4de3505c40a0444-327723bce298e3ff5813fb42baeefbaa.ssl.cf1.rackcdn.com/d43e4bbeefd925914d29dc280e8d3a56.png
(The project is here: http://www.smbaker.com/converting-a-seeburg-3wa-wallbox-into-a-remote-for-a-modern-music-player)
I'm trying to figure out what the capacitances of C1, C2 and C7 are and where they go on the board as it's not very clear. Based on his photo of his final product, he didn't use one of those capacitors (I think it's C2). My guess is that C1 and C7 are the same.
Anyone out there to help?
capacitor
asked 4 hours ago
andiegoonie
61
New contributor
andiegoonie is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |Â
up vote
1
down vote
favorite
up vote
1
down vote
favorite
I'm recreating a raspberry pi project and ordered a custom pi hat to follow their schematic. The only issue is that it doesn't have all of the information. I've emailed the creator but am yet to hear a response.
The actual schematic:
http://www.smbaker.com/wordpress/wp-content/uploads/2018/03/piseeburg-schematic.jpg
And the board:
https://644db4de3505c40a0444-327723bce298e3ff5813fb42baeefbaa.ssl.cf1.rackcdn.com/d43e4bbeefd925914d29dc280e8d3a56.png
(The project is here: http://www.smbaker.com/converting-a-seeburg-3wa-wallbox-into-a-remote-for-a-modern-music-player)
I'm trying to figure out what the capacitances of C1, C2 and C7 are and where they go on the board as it's not very clear. Based on his photo of his final product, he didn't use one of those capacitors (I think it's C2). My guess is that C1 and C7 are the same.
Anyone out there to help?
capacitor
asked 4 hours ago
andiegoonie
61
New contributor
andiegoonie is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I'm recreating a raspberry pi project and ordered a custom pi hat to follow their schematic. The only issue is that it doesn't have all of the information. I've emailed the creator but am yet to hear a response.
The actual schematic:
http://www.smbaker.com/wordpress/wp-content/uploads/2018/03/piseeburg-schematic.jpg
And the board:
https://644db4de3505c40a0444-327723bce298e3ff5813fb42baeefbaa.ssl.cf1.rackcdn.com/d43e4bbeefd925914d29dc280e8d3a56.png
(The project is here: http://www.smbaker.com/converting-a-seeburg-3wa-wallbox-into-a-remote-for-a-modern-music-player)
I'm trying to figure out what the capacitances of C1, C2 and C7 are and where they go on the board as it's not very clear. Based on his photo of his final product, he didn't use one of those capacitors (I think it's C2). My guess is that C1 and C7 are the same.
Anyone out there to help?
capacitor
capacitor
asked 4 hours ago
andiegoonie
61
New contributor
andiegoonie is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 4 hours ago
andiegoonie
61
New contributor
andiegoonie is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 4 hours ago
andiegoonie
61
New contributor
andiegoonie is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 4 hours ago
andiegoonie
61
asked 4 hours ago
andiegoonie
61
61
New contributor
andiegoonie is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
andiegoonie is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
andiegoonie is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |Â
add a comment |Â
2 Answers
2
active
oldest
votes
up vote
2
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Looks like Damien beat me to it :-)
C1, C7 would be the Vcc decoupling capacitor for the I2C parallel port IC_X (no designator in schematic that I can see, but given the footprint right below IC2), and IC2, its located by the notch on IC2 and D5. Normally these are 0.1uf ceramic.
IC1 relay driver based on pin connections (6,7,8 going to ground) is to the left of C4 and C2 is the ceramic bypass to to free-wheel diode common (pin 9).
C2 is a -polarized- capacitor located just to the left of JP3 (note the + sign when installing). Value there not easy to determine, given typical sizing/voltage at 5V for a 2-3 safety margin of 10-16WVDC I'd say 4.7-22uF given the overall radial diameter.
answered 3 hours ago
isdi
6816
add a comment |Â
up vote
2
down vote
C1 is a bypass capacitor for the IC that is just beside. Since not all the parts are labelled, it's difficult to know where it is placed on the board. My guess would be the one on the center right, before the dashed line.
C2 seems to be a bulk cap for the relay, so that there is no power drop when the relay is activated. C7 is also probably a bulk cap for VDD.
Although it's not obvious where it's placed on the board and seems it might not be there at all.
The circuit could work without those caps, although it is usually very recommended to have bypass cap (like C1) as you might start to get into some very difficult to understand issues if they are missing.
For C2 and C7, those are like reservoir of power, the circuit might also work without.
There is something more of a concern on this circuit, is that the relays doesn't have a flyback diode. Unless it's relay with integrated flyback diode, when switched off, the coil of the relay will generate a high voltage spike that might kill the ULN2003 or more components. Flyback diodes Included in the ULN2003
answered 3 hours ago
Damien
1,071112
I seem to recall the ULN2003 has those integrated within (don't have the datasheet, so I'd double check to make sure (bedtime for me).
– isdi
3 hours ago
the ULN2003 has flyback diodes for each output, connected to the COM terminal so it's okay. That's exactly what they are there for.
– Spehro Pefhany
3 hours ago
You are correct, my bad
– Damien
2 hours ago
add a comment |Â
2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
2
down vote
Looks like Damien beat me to it :-)
C1, C7 would be the Vcc decoupling capacitor for the I2C parallel port IC_X (no designator in schematic that I can see, but given the footprint right below IC2), and IC2, its located by the notch on IC2 and D5. Normally these are 0.1uf ceramic.
IC1 relay driver based on pin connections (6,7,8 going to ground) is to the left of C4 and C2 is the ceramic bypass to to free-wheel diode common (pin 9).
C2 is a -polarized- capacitor located just to the left of JP3 (note the + sign when installing). Value there not easy to determine, given typical sizing/voltage at 5V for a 2-3 safety margin of 10-16WVDC I'd say 4.7-22uF given the overall radial diameter.
answered 3 hours ago
isdi
6816
add a comment |Â
up vote
2
down vote
Looks like Damien beat me to it :-)
C1, C7 would be the Vcc decoupling capacitor for the I2C parallel port IC_X (no designator in schematic that I can see, but given the footprint right below IC2), and IC2, its located by the notch on IC2 and D5. Normally these are 0.1uf ceramic.
IC1 relay driver based on pin connections (6,7,8 going to ground) is to the left of C4 and C2 is the ceramic bypass to to free-wheel diode common (pin 9).
C2 is a -polarized- capacitor located just to the left of JP3 (note the + sign when installing). Value there not easy to determine, given typical sizing/voltage at 5V for a 2-3 safety margin of 10-16WVDC I'd say 4.7-22uF given the overall radial diameter.
answered 3 hours ago
isdi
6816
add a comment |Â
up vote
2
down vote
up vote
2
down vote
Looks like Damien beat me to it :-)
C1, C7 would be the Vcc decoupling capacitor for the I2C parallel port IC_X (no designator in schematic that I can see, but given the footprint right below IC2), and IC2, its located by the notch on IC2 and D5. Normally these are 0.1uf ceramic.
IC1 relay driver based on pin connections (6,7,8 going to ground) is to the left of C4 and C2 is the ceramic bypass to to free-wheel diode common (pin 9).
C2 is a -polarized- capacitor located just to the left of JP3 (note the + sign when installing). Value there not easy to determine, given typical sizing/voltage at 5V for a 2-3 safety margin of 10-16WVDC I'd say 4.7-22uF given the overall radial diameter.
answered 3 hours ago
isdi
6816
Looks like Damien beat me to it :-)
C1, C7 would be the Vcc decoupling capacitor for the I2C parallel port IC_X (no designator in schematic that I can see, but given the footprint right below IC2), and IC2, its located by the notch on IC2 and D5. Normally these are 0.1uf ceramic.
IC1 relay driver based on pin connections (6,7,8 going to ground) is to the left of C4 and C2 is the ceramic bypass to to free-wheel diode common (pin 9).
C2 is a -polarized- capacitor located just to the left of JP3 (note the + sign when installing). Value there not easy to determine, given typical sizing/voltage at 5V for a 2-3 safety margin of 10-16WVDC I'd say 4.7-22uF given the overall radial diameter.
answered 3 hours ago
isdi
6816
answered 3 hours ago
isdi
6816
answered 3 hours ago
isdi
6816
answered 3 hours ago
isdi
6816
6816
add a comment |Â
add a comment |Â
up vote
2
down vote
C1 is a bypass capacitor for the IC that is just beside. Since not all the parts are labelled, it's difficult to know where it is placed on the board. My guess would be the one on the center right, before the dashed line.
C2 seems to be a bulk cap for the relay, so that there is no power drop when the relay is activated. C7 is also probably a bulk cap for VDD.
Although it's not obvious where it's placed on the board and seems it might not be there at all.
The circuit could work without those caps, although it is usually very recommended to have bypass cap (like C1) as you might start to get into some very difficult to understand issues if they are missing.
For C2 and C7, those are like reservoir of power, the circuit might also work without.
There is something more of a concern on this circuit, is that the relays doesn't have a flyback diode. Unless it's relay with integrated flyback diode, when switched off, the coil of the relay will generate a high voltage spike that might kill the ULN2003 or more components. Flyback diodes Included in the ULN2003
answered 3 hours ago
Damien
1,071112
I seem to recall the ULN2003 has those integrated within (don't have the datasheet, so I'd double check to make sure (bedtime for me).
– isdi
3 hours ago
the ULN2003 has flyback diodes for each output, connected to the COM terminal so it's okay. That's exactly what they are there for.
– Spehro Pefhany
3 hours ago
You are correct, my bad
– Damien
2 hours ago
add a comment |Â
up vote
2
down vote
C1 is a bypass capacitor for the IC that is just beside. Since not all the parts are labelled, it's difficult to know where it is placed on the board. My guess would be the one on the center right, before the dashed line.
C2 seems to be a bulk cap for the relay, so that there is no power drop when the relay is activated. C7 is also probably a bulk cap for VDD.
Although it's not obvious where it's placed on the board and seems it might not be there at all.
The circuit could work without those caps, although it is usually very recommended to have bypass cap (like C1) as you might start to get into some very difficult to understand issues if they are missing.
For C2 and C7, those are like reservoir of power, the circuit might also work without.
There is something more of a concern on this circuit, is that the relays doesn't have a flyback diode. Unless it's relay with integrated flyback diode, when switched off, the coil of the relay will generate a high voltage spike that might kill the ULN2003 or more components. Flyback diodes Included in the ULN2003
answered 3 hours ago
Damien
1,071112
I seem to recall the ULN2003 has those integrated within (don't have the datasheet, so I'd double check to make sure (bedtime for me).
– isdi
3 hours ago
the ULN2003 has flyback diodes for each output, connected to the COM terminal so it's okay. That's exactly what they are there for.
– Spehro Pefhany
3 hours ago
You are correct, my bad
– Damien
2 hours ago
add a comment |Â
up vote
2
down vote
up vote
2
down vote
C1 is a bypass capacitor for the IC that is just beside. Since not all the parts are labelled, it's difficult to know where it is placed on the board. My guess would be the one on the center right, before the dashed line.
C2 seems to be a bulk cap for the relay, so that there is no power drop when the relay is activated. C7 is also probably a bulk cap for VDD.
Although it's not obvious where it's placed on the board and seems it might not be there at all.
The circuit could work without those caps, although it is usually very recommended to have bypass cap (like C1) as you might start to get into some very difficult to understand issues if they are missing.
For C2 and C7, those are like reservoir of power, the circuit might also work without.
There is something more of a concern on this circuit, is that the relays doesn't have a flyback diode. Unless it's relay with integrated flyback diode, when switched off, the coil of the relay will generate a high voltage spike that might kill the ULN2003 or more components. Flyback diodes Included in the ULN2003
answered 3 hours ago
Damien
1,071112
C1 is a bypass capacitor for the IC that is just beside. Since not all the parts are labelled, it's difficult to know where it is placed on the board. My guess would be the one on the center right, before the dashed line.
C2 seems to be a bulk cap for the relay, so that there is no power drop when the relay is activated. C7 is also probably a bulk cap for VDD.
Although it's not obvious where it's placed on the board and seems it might not be there at all.
The circuit could work without those caps, although it is usually very recommended to have bypass cap (like C1) as you might start to get into some very difficult to understand issues if they are missing.
For C2 and C7, those are like reservoir of power, the circuit might also work without.
There is something more of a concern on this circuit, is that the relays doesn't have a flyback diode. Unless it's relay with integrated flyback diode, when switched off, the coil of the relay will generate a high voltage spike that might kill the ULN2003 or more components. Flyback diodes Included in the ULN2003
answered 3 hours ago
Damien
1,071112
edited 2 hours ago
answered 3 hours ago
Damien
1,071112
answered 3 hours ago
Damien
1,071112
answered 3 hours ago
Damien
1,071112
1,071112
I seem to recall the ULN2003 has those integrated within (don't have the datasheet, so I'd double check to make sure (bedtime for me).
– isdi
3 hours ago
the ULN2003 has flyback diodes for each output, connected to the COM terminal so it's okay. That's exactly what they are there for.
– Spehro Pefhany
3 hours ago
You are correct, my bad
– Damien
2 hours ago
add a comment |Â
I seem to recall the ULN2003 has those integrated within (don't have the datasheet, so I'd double check to make sure (bedtime for me).
– isdi
3 hours ago
the ULN2003 has flyback diodes for each output, connected to the COM terminal so it's okay. That's exactly what they are there for.
– Spehro Pefhany
3 hours ago
You are correct, my bad
– Damien
2 hours ago
I seem to recall the ULN2003 has those integrated within (don't have the datasheet, so I'd double check to make sure (bedtime for me).
– isdi
3 hours ago
I seem to recall the ULN2003 has those integrated within (don't have the datasheet, so I'd double check to make sure (bedtime for me).
– isdi
3 hours ago
the ULN2003 has flyback diodes for each output, connected to the COM terminal so it's okay. That's exactly what they are there for.
– Spehro Pefhany
3 hours ago
the ULN2003 has flyback diodes for each output, connected to the COM terminal so it's okay. That's exactly what they are there for.
– Spehro Pefhany
3 hours ago
You are correct, my bad
– Damien
2 hours ago
You are correct, my bad
– Damien
2 hours ago
add a comment |Â
andiegoonie is a new contributor. Be nice, and check out our Code of Conduct.
andiegoonie is a new contributor. Be nice, and check out our Code of Conduct.
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