Nice picture HPotter.
Yes HPotter I agree with you about p2p wiring, it does sounds better. I have listened to many tube amps that way. I get a kick out of showing engineers and technicians Mr. Pass's p2p A40 picture in TAA 1978.
I p2p wired my output stages of two Borbely monoblocks amps. And the only problems I had was the gate resistors to the fets breaking off.
See a long time ago a dog bit me, a lazy dog so I'm lazy that why I like to use PCBs. After prototying circuits at work and prototyping at home (solderless proto boards) I don't have the energy to prototype any more.
Yes HPotter I agree with you about p2p wiring, it does sounds better. I have listened to many tube amps that way. I get a kick out of showing engineers and technicians Mr. Pass's p2p A40 picture in TAA 1978.
I p2p wired my output stages of two Borbely monoblocks amps. And the only problems I had was the gate resistors to the fets breaking off.
See a long time ago a dog bit me, a lazy dog so I'm lazy that why I like to use PCBs. After prototying circuits at work and prototyping at home (solderless proto boards) I don't have the energy to prototype any more.
Dale,
The sketch is also just an illustration. The inputs are on the left: Sense, Drain, Gate, Source (from top to bottom). The outputs are on the right, so that you can tie two boards together. The sense needs to only go into the first board.
This is the design that I would use if boards are going to be manufacturered. To get boards made, it only makes sense if you get the volume up there, and the boards with 3 each allow for a lot more versatility.
If you are going to etch boards for only an Aleph 2/4, I would just stick to Wayne Sankey's design.
--
Brian
gte619j@prism.gatech.edu
The sketch is also just an illustration. The inputs are on the left: Sense, Drain, Gate, Source (from top to bottom). The outputs are on the right, so that you can tie two boards together. The sense needs to only go into the first board.
This is the design that I would use if boards are going to be manufacturered. To get boards made, it only makes sense if you get the volume up there, and the boards with 3 each allow for a lot more versatility.
If you are going to etch boards for only an Aleph 2/4, I would just stick to Wayne Sankey's design.
--
Brian
gte619j@prism.gatech.edu
Peter,
I agree with you about point to point wiring, but I would go a bit further and run seperate returns for rails, grounds ect. a true star arrangement for best sonics rather than a bus. It takes a lot of work and wire but if you have the time...
Jam
I agree with you about point to point wiring, but I would go a bit further and run seperate returns for rails, grounds ect. a true star arrangement for best sonics rather than a bus. It takes a lot of work and wire but if you have the time...
Jam
Peter,
Try it you might be surprised, I would also add a small local decoupling capacitior where the supply rails attach to each output device.
Jam
Try it you might be surprised, I would also add a small local decoupling capacitior where the supply rails attach to each output device.
Jam
For you guys who are looking to do the output PCBs. I had already order all parts for the Aelph 2 including output stage components but no transistors before I ordered the PCBs through BrianGT. I brought 24 power resistors the Xicon kind from the Mouser catalog which with not fit on any of the output PCBs I have seen.
What I trying to say is that I am going to use ExpressPCB to personalize my output PCB to the parts I have and the hole pattern of my heatsinks fins. Though this may not be the cheapest way to go but it will be the fastest.
😎
What I trying to say is that I am going to use ExpressPCB to personalize my output PCB to the parts I have and the hole pattern of my heatsinks fins. Though this may not be the cheapest way to go but it will be the fastest.
😎
jam,
what exactly is a "true star arrangement"? Do you mean that you would run the seperate wires from the main board to each output device?
--
Brian
gte619j@prism.gatech.edu
what exactly is a "true star arrangement"? Do you mean that you would run the seperate wires from the main board to each output device?
--
Brian
gte619j@prism.gatech.edu
Brian,
You are correct. You would have to run seperate wires to each output device to the power supply and this is also true for the grounds. It might look messy with all the extra wire but there are sonic gains to be had if done correctly.
Jam
You are correct. You would have to run seperate wires to each output device to the power supply and this is also true for the grounds. It might look messy with all the extra wire but there are sonic gains to be had if done correctly.
Jam
Point to point
"I don't think I buy the "wiring sounds better" argument if you use 2 oz copper for these boards." And you would be wrong, point to point wiring sounds better..... I never have understood why anybody would want to do a one off board for a simple design since the effort exceeds point to point wiring for a simple circuit and compromises the sound. I have even seen comercial high end designs with PCBs where the long signal runs are still point to point wire.
H.H.
"I don't think I buy the "wiring sounds better" argument if you use 2 oz copper for these boards." And you would be wrong, point to point wiring sounds better..... I never have understood why anybody would want to do a one off board for a simple design since the effort exceeds point to point wiring for a simple circuit and compromises the sound. I have even seen comercial high end designs with PCBs where the long signal runs are still point to point wire.
H.H.
The point here was to show the difference between ' star' grounds, supplies and the 'bus' approach. For the bus to be optimal it has to have an impedence of zero ohms which is almost impossible to achieve (Cryogenics anyone).
You point about using a star on a pcb is taken but you still have to take the capacatiance of the board into account. I will have to admit that sometimes a board is superior especially if SMD's are used and short trace requirements are a must.
Jam
You point about using a star on a pcb is taken but you still have to take the capacatiance of the board into account. I will have to admit that sometimes a board is superior especially if SMD's are used and short trace requirements are a must.
Jam
I think Jam hits the nail on the head. There are more then a few very fine sounding amplifiers out there that have very little p2p wiring. And I'm sure there are about as many fine sounding amplifiers that are nothing but p2p wiring.
I think the implementation is as important, if not more important then the method. What ever the method, all of the factors like grounding, stray capacitance, trace or wire size, routing, etc. have to be considered. The design of the amp and the implementation of that design both have to be right whether PC boards are used or p2p.
Rodd Yamashita
I think the implementation is as important, if not more important then the method. What ever the method, all of the factors like grounding, stray capacitance, trace or wire size, routing, etc. have to be considered. The design of the amp and the implementation of that design both have to be right whether PC boards are used or p2p.
Rodd Yamashita
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