AndrewT said:Hi Andrea,
rewire your mains and transformer.
The mains Safety Earth (third wire) must go straight to chassis and be PERMANENTLY connected with a MECHANICAL fixing, not soldered.
The two secondary windings must go to the four connections on the PSU board.
Sorry Andrew, you can modify my design in the right way? So is more clear for me!
Thanks
Andrea,
if I were you, I will try what Andrew said:
Cheers
Peppe
if I were you, I will try what Andrew said:
AndrewT said:The two secondary windings must go to the four connections on the PSU board.
Cheers
Peppe
Ciao Andrea,
from my experience with Aleph30 (2 built) I can suggest:
-Use the gnd area on the power supply pcb as star ground
-Bring there all gnd connections, including signal gnd
-Connect safety earth from IEC socket to case but not directly to GND. This will prevent earth loop if another appliance is connected to earth without loosening safety.
In case you can connect them with a resistor, a RC network or whatever you like.
I also strongly suggest the use of a separate rectifier bridge for each secondary winding. With your PCB it must be wired externally but I think it is worth it.
Ciao!
Andrea
from my experience with Aleph30 (2 built) I can suggest:
-Use the gnd area on the power supply pcb as star ground
-Bring there all gnd connections, including signal gnd
-Connect safety earth from IEC socket to case but not directly to GND. This will prevent earth loop if another appliance is connected to earth without loosening safety.
In case you can connect them with a resistor, a RC network or whatever you like.
I also strongly suggest the use of a separate rectifier bridge for each secondary winding. With your PCB it must be wired externally but I think it is worth it.
Ciao!
Andrea
News:
I've modify the layout (sorry but attach file don't working) and now the problem is resolved
Thank you all for helping!!
Last thing........very strange
If I link both RCA, ONLY in speaker right feel a slight hum.....if I reverse the link, the hum exit from left speaker.
I suppose that the problem is not the Aleph......right?
I've modify the layout (sorry but attach file don't working) and now the problem is resolved
Thank you all for helping!!
Last thing........very strange
If I link both RCA, ONLY in speaker right feel a slight hum.....if I reverse the link, the hum exit from left speaker.
I suppose that the problem is not the Aleph......right?
Peppe said:Good news Andrea,
if you reverse the cables and the hum chance channel, no.
Try with other source and/or others cables.
Enjoy tour Aleph
Cheers
Peppe
Yeah, i'll try........first with another cable, after with another source
Now, Aleph needs a pre......P 1.7 or what?
Peppe said:BOZ because of simplicity (IMHO good starts for newbie)
B1 because (with your speaker) the gain you need is enough
P1.7 because of balanced in/out
Any other you like...
It is up to you
Peppe
Mmmm i think P1.7 is the best choice because I want to connect through balanced out pre with final.
there are no tube pre made by pass?
know where i find the PCB for P1.7?........Mmmmm KK-PCB or where?
I Attach the mass layout that i used
Attachments
Edit: Andrew was faster than me.
Andrea,
I see NO star-ground!
Follow what Andrea said:
Mmmm... 3 Andrea in this thread!
Ciao
Peppe
Andrea,
I see NO star-ground!
Follow what Andrea said:
Andypairo said:
-Use the gnd area on the power supply pcb as star ground
-Bring there all gnd connections, including signal gnd
Mmmm... 3 Andrea in this thread!
Ciao
Peppe
Peppe said:Edit: Andrew was faster than me.
Andrea,
I see NO star-ground!
Follow what Andrea said:
Mmmm... 3 Andrea in this thread!
Ciao
Peppe
.......But If i attach the Earth with the GND on the power pcb the hum restart
Argh!......this amply make me crazy
You don't have to connect safety earth and signal gnd with a short, start with a low value resistor (10 Ohm or so) and report what happens.
Do you have other earthed appliances in the audio chain ?
Ciao
Andrea
Btw my suggestion included to wire the input socket gnd direct to the power supply pcb.
Do you have other earthed appliances in the audio chain ?
Ciao
Andrea
Btw my suggestion included to wire the input socket gnd direct to the power supply pcb.
Andypairo said:You don't have to connect safety earth and signal gnd with a short, start with a low value resistor (10 Ohm or so) and report what happens.
Do you have other earthed appliances in the audio chain ?
Ciao
Andrea
Btw my suggestion included to wire the input socket gnd direct to the power supply pcb.
Ok i try with a resistor and report what happens. Watt of resistor is important?
Mi source CD have a earth.
Input gnd RCA directly to the Power PCB or through the Main Amplifier PCB is the same thing IMHO.......see the layout of Main PCB
Ciao,
since you already have the CD earthed you can connect the gnd of the amp with a resistor (at least 1W) or with a RC network.
Connecting the gnd of input sockets (I hope these are isolated from the chassis!) to the main board won't do any harm if almost no current flows into the connection between main board and star ground.
Hint: where do you connect the speaker return?
Ciao!
Andrea
since you already have the CD earthed you can connect the gnd of the amp with a resistor (at least 1W) or with a RC network.
Connecting the gnd of input sockets (I hope these are isolated from the chassis!) to the main board won't do any harm if almost no current flows into the connection between main board and star ground.
Hint: where do you connect the speaker return?
Ciao!
Andrea
Andypairo said:With this wiring the return current form the speaker will flow into the wire between the 2 pcbs, modulating the voltage of the "gnd" of the main pcb.
Do you understand now why I said that is better to bring all gnd wires to the star ground?
Cheers
Andrea
Ok Andy, i understand ........I'll try tomorrow to modify the wiring when you advice.
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