Can Class D be built on a single side PCB???

Leolabs · 2nd January 2007, 12:48 AM

Saw that many are built on double side PCB,have anyone try single side only???

zilog · 2nd January 2007, 12:55 AM

You can, but it will perform much worse. That is, assuming that you would otherwise use the second side of a 2-side PCB as an uninterrupted ground plane which greatly reduces PCB track inductances.

BWRX · 2nd January 2007, 04:39 PM

You can build a class d amp on a breadboard if you want. How well it works depends on how well you construct it. How well a design works on a 1 layer board will also depend on how well the board is routed. 2 layers gives you more freedom and is usually the minimum number of layers you'd want to use if you're going to have boards made by a board house.

odnaizutra · 3rd January 2007, 04:34 PM

Try double layer ,you will not suffer as much as i did.

phase_accurate · 4th January 2007, 06:18 AM

The PCB is one of the most important components of a switching amp. A bad PCB (i.e. construction, layout etc) will make an amp perform worse than what would be potentially possible with a given circuit.

So you can definitely build an amp on a single-sided PCB in order to check if the circuit as such is working - but keep in mind that the time you spend on this might be better used for a first "proper" prototype. But you will not be able to get reliable performance measurements this way.

Regards

Charles

zilog · 4th January 2007, 06:36 AM

I am waiting to get my new set of PCB:s manufactured, this will be the first time I use uninterrupted ground planes as compared to my groundplanes everywhere-approach in my last amplifier.

Will be nice to see the differences now when I know how the last one performed.

fumac · 9th January 2007, 11:43 AM

i have built it 4X80W single side pcb
but it's a hard work

kcchow · 10th January 2007, 06:27 AM

It is not a good idea to use single side PCB! I designed over 10 projects using 5-6 kinds of class-D/class-T amplifier but all of them need to use double layer PCB!

classd_fromru · 10th January 2007, 08:51 AM

Hi,
I build my first UcDs on a single-side PCB, its work fine

http://www.classd.fromru.com/circuits/ucd1.html
http://www.classd.fromru.com/circuits/ucd2.html

But now i trying to use 2-side pcb, its better:

http://www.classd.fromru.com/circuits/ucd3.html
http://www.classd.fromru.com/circuits/ucd4.html

ChocoHolic · 12th January 2007, 03:09 PM

From my perception it might also depend on the power which you are adressing.
I am currently struggling even with my double sided board. But my currents are high. Somewhere around 40A output current the generated noise seems to trigger undesired shut downs. At this level the di/dt in the switching devices and related rail capacitors is ranging between 500A/us to 1000A/us.
Already quite small inductances do cause remarkable voltage drops. Furtheron such powerful and fast di/dt do induce unpleasant voltage peaks in all tracks nearby...

....from what I see on my board, I would expect that you can handle amps with output currents up to 10A peak (may be 15A) with on a single sided PCB.
Things are getting generally easier, if you are willing to reduce switching speed. Please note switching speed does not just mean the operating frequency. It is more about the dv/dt and especially di/dt in the switching devices.

2nd January 2007, 12:48 AM	#1
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	Can Class D be built on a single side PCB??? Saw that many are built on double side PCB,have anyone try single side only???

2nd January 2007, 04:39 PM	#3
BWRX diyAudio Moderator Emeritus Join Date: Jan 2005 Location: Pennsylvania	You can build a class d amp on a breadboard if you want. How well it works depends on how well you construct it. How well a design works on a 1 layer board will also depend on how well the board is routed. 2 layers gives you more freedom and is usually the minimum number of layers you'd want to use if you're going to have boards made by a board house. __________________ Brian

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2nd January 2007, 12:55 AM	#2
zilog diyAudio Member Join Date: Oct 2005	You can, but it will perform much worse. That is, assuming that you would otherwise use the second side of a 2-side PCB as an uninterrupted ground plane which greatly reduces PCB track inductances.

3rd January 2007, 04:34 PM	#4
odnaizutra diyAudio Member Join Date: Jan 2007	Try double layer ,you will not suffer as much as i did.

4th January 2007, 06:18 AM	#5
phase_accurate diyAudio Member Join Date: May 2002 Location: Switzerland	The PCB is one of the most important components of a switching amp. A bad PCB (i.e. construction, layout etc) will make an amp perform worse than what would be potentially possible with a given circuit. So you can definitely build an amp on a single-sided PCB in order to check if the circuit as such is working - but keep in mind that the time you spend on this might be better used for a first "proper" prototype. But you will not be able to get reliable performance measurements this way. Regards Charles

4th January 2007, 06:36 AM	#6
zilog diyAudio Member Join Date: Oct 2005	I am waiting to get my new set of PCB:s manufactured, this will be the first time I use uninterrupted ground planes as compared to my groundplanes everywhere-approach in my last amplifier. Will be nice to see the differences now when I know how the last one performed.

9th January 2007, 11:43 AM	#7
fumac diyAudio Member Join Date: Oct 2006	i have built it 4X80W single side pcb but it's a hard work

10th January 2007, 06:27 AM	#8
kcchow diyAudio Member Join Date: Jan 2007	It is not a good idea to use single side PCB! I designed over 10 projects using 5-6 kinds of class-D/class-T amplifier but all of them need to use double layer PCB!

10th January 2007, 08:51 AM	#9
classd_fromru diyAudio Member Join Date: Nov 2006	Hi, I build my first UcDs on a single-side PCB, its work fine http://www.classd.fromru.com/circuits/ucd1.html http://www.classd.fromru.com/circuits/ucd2.html But now i trying to use 2-side pcb, its better: http://www.classd.fromru.com/circuits/ucd3.html http://www.classd.fromru.com/circuits/ucd4.html

12th January 2007, 03:09 PM	#10
ChocoHolic diyAudio Member Join Date: Dec 2003 Location: Munich	From my perception it might also depend on the power which you are adressing. I am currently struggling even with my double sided board. But my currents are high. Somewhere around 40A output current the generated noise seems to trigger undesired shut downs. At this level the di/dt in the switching devices and related rail capacitors is ranging between 500A/us to 1000A/us. Already quite small inductances do cause remarkable voltage drops. Furtheron such powerful and fast di/dt do induce unpleasant voltage peaks in all tracks nearby... ....from what I see on my board, I would expect that you can handle amps with output currents up to 10A peak (may be 15A) with on a single sided PCB. Things are getting generally easier, if you are willing to reduce switching speed. Please note switching speed does not just mean the operating frequency. It is more about the dv/dt and especially di/dt in the switching devices.

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