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Limited offer of Aleph30 PCB boards

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#102
yes, I know that is signal ground from aleph 30 wiki, but don't understand the different between the signal ground and power ground. what is it good for. when I traced the circuit from the circuit board, look like it go no where (maybe I am wrong). and also, resistor R6 has 3 holes. I just want to understand the circuit better. look like the board can allow people to use slightly different circuit design other than the original aleph 30 design. If yes, what are those design?
 
#103
hc167 said:
I got few questions about the board. what is the different between GND and SC on the board. look like I suppose to connect GNG and SC together in order to made it work (by connect the opt). what is the purpose of having SC? I really don't understand this. Second, look like I always need to connect the two jumpers on the back of the board. right? also, for the speaker output negative terminal, is it ok to connect from the ground of the filter capacitors in the PS circuit or I better connect the ground of the filter capacitors in the PS circuit to the board, and then route to the speaker negative terminal? thanks a lot for all of your answer.
Click to expand...

The GND and SG connection points have been explained here: http://www.diyaudio.com/forums/showthread.php?postid=617070#post617070
In most cases they are connected together, and that's how I did it in the amp I built for myself. You can also run separate wires from those points to your star ground, as some people apparantely reported improvement from such arrangement.

Yes, the two jumpers need to be always installed, I just couldn't run traces there.

The negative speaker terminal should be connected directly to ground of the filter capacitors, the SG and GND from the board connect to that point as well (with a single or two separate wires)
 

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#104
hi Peter,

after reading your post, I think I got your idea. so ground need to connected to the ground of the filter capacitors. however, you physically separate the input signal ground and the constant current ground, you created GND and SG so that they both won't connected directly. In this case, althrough they are still connected, the ground of the signal will go directly into filter caps ground without using the route of the constant current ground. right? I believe this will have improvment (but maybe not very obvious). for the same reason, speaker ground should go from filter cap to SG and then to the speaker terminal negative output to get better performance (again, the improvement may not be obvious), do you think so?
 
#105
hc167 said:
for the same reason, speaker ground should go from filter cap to SG and then to the speaker terminal negative output to get better performance (again, the improvement may not be obvious), do you think so?
Click to expand...

You are correct about GND and SG.

However, the output ground is high current connection and should go directly from main filter caps to ouput terminal, you don't want to run it through the board and affect low current signals there. Connecting SG and GND with wires to main caps is basically the same though, just done away from the board.

I've built some Alephs before (usually p2p) and always had some hum problems. With those boards the amp is dead quiet.
 
#107
Gainclone?

Peter, I notice you are active in the Chip amp forum as well. As tired as this question may be, and as variable as people's set-ups, how would you compare the sound of the Aleph 30 to your favorite flavor of chip amp?

Thanks again for all the information.

Steve
 
#108
To be diplomatic, I will say the comparison would be similar to Aleph 30 and Zv9, as the Zv9 that I've built sounds very similar to my favourite GC 😉

What I remember from A30 was very nice midrange: liquid and melodic. I didn't like highs that much, but it's probably a matter of components selection. Also, Aleph can be better with difficult loads.

Properly built GC has involvement factor that is really hard to match by most amps.
 
#109
Ufff...

Peter, I just found your Audiosector web page. Very impressive.

The more I look, a chip amp might be more appropriate for my skill level (which you can guess from the kind of questions I'm asking). Putting together a power supply with 150,000uF of capacitance, I don't know....

I'll make my way through the project pages for the different boards you sell. It is possible that I might come back to the Pass Labs idea. In any case, thanks again for the information and advice.
 
#113
Is there a specific type of screw/fastener used to secure mosfet to heatsink?
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The data sheet (you can find them by searching by device name) calls out a 6-32 or m-3 screw. This implies preparing a tapped hole or drilling through and fastening a nut on the backside. Don't overlook lock washers, insulators & heat transfer grease. The washers should be those that match the screw.
 
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