@voxac30
For pcb i use basically schematic (you have on first page). But for short curcuit protection (with NE555) I used Nmos schematic. His basically schematic is ok and corect and workig, but part with ne555 is "new" and i decided to make pcb.
Wait until tomorrow, I will have basically pcb with some other thinks 🙂
For pcb i use basically schematic (you have on first page). But for short curcuit protection (with NE555) I used Nmos schematic. His basically schematic is ok and corect and workig, but part with ne555 is "new" and i decided to make pcb.
Wait until tomorrow, I will have basically pcb with some other thinks 🙂
giovyy: I posted replay but i dont know where it is 🙂
Your pcb is good, but traks for main supplay rail are very thin, and output to. Bold traks for V+ V- Output and trak that conecting drain source and output coil.
Your pcb is good, but traks for main supplay rail are very thin, and output to. Bold traks for V+ V- Output and trak that conecting drain source and output coil.
Thanks Dzony988. Can i make PCB without any modificaiton? how was your experience of this amp?
This PCB?
The width of the tracks is not that much a problem.
The biggest problem is that each cycle there are currents flowing through both supplies and ground. Body diode conduction at hard switching is one of them.
The way it flows in your PCB is through GND connection which goes round the whole board with all the sesnitive circuits inside the loop, also it includes input audio ground.
Is that really that hard to accept continous unbroken ground plane?
I could design a good PCB for this design if the people are interested, but I would have my terms...
darkfenriz... the problem is that most of the users on this forum that can design PCBs are experienced in standard PCB design not RF PCB design.
People try to understand the following:
If you use unshielded cables for audio amp input you will have lots of unwanted noise at the output.
The same principle applies to class d amps. they have to be as shielded as possible in order to work properly. other important thing is to use traces as short as possible especially power and signal traces and also you have to avoid loops as much as possible.
regards,
savu
People try to understand the following:
If you use unshielded cables for audio amp input you will have lots of unwanted noise at the output.
The same principle applies to class d amps. they have to be as shielded as possible in order to work properly. other important thing is to use traces as short as possible especially power and signal traces and also you have to avoid loops as much as possible.
regards,
savu
seems much better. connect the ground plane as close to the ground wire supply connection so that it won't make loops. also remove the long ground trace and just solder the component pins directly to the ground plane trough holes in the PCB.
regards,
savu
regards,
savu
much better...
try to make it smaller by reducing the lenght on the board. you have unused space on the left that you can reduce.
regards,
savu
try to make it smaller by reducing the lenght on the board. you have unused space on the left that you can reduce.
regards,
savu
Here are my scope pictures (and the test setup)
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
