My Aleph J is balanced (XLR). From XLR I have conected plus and minus to RCA. I use jumpers in the XLR connectors between ground an and minus.
When nothing is connected on input I get hum with jumpers.
Without jumpers it's quiet.
When I connect preamp/source its also hum with jumpers inside. But the strange here is that its becomes quiet if I only remove one jumper.
Can someone help me?
Is it necessary to use jumpers when I use rca connections. If I remove jumpers and only use plus and minus it will become quiet. I also think minus and ground will be connected in the preamp side. with jumpers it will be connected at the Alpeh side two, but is it necessary.
When nothing is connected on input I get hum with jumpers.
Without jumpers it's quiet.
When I connect preamp/source its also hum with jumpers inside. But the strange here is that its becomes quiet if I only remove one jumper.
Can someone help me?
Is it necessary to use jumpers when I use rca connections. If I remove jumpers and only use plus and minus it will become quiet. I also think minus and ground will be connected in the preamp side. with jumpers it will be connected at the Alpeh side two, but is it necessary.
pictures, pretty please
to paraphrase you- from XLR you need to connect plus and GND to RCA
minus goes to pcb directly
to paraphrase you- from XLR you need to connect plus and GND to RCA
minus goes to pcb directly
Thanks.
But if I connect ground and plus to rca and use jumper in xlr between ground and minus it will be the same. Do I need this jumper?
But if I connect ground and plus to rca and use jumper in xlr between ground and minus it will be the same. Do I need this jumper?
first do it as it must be done
and yes, if going unbalanced in, XLR pin 3 ( negative phase) must be grounded
and yes, if going unbalanced in, XLR pin 3 ( negative phase) must be grounded
Hi, I have connected ground and plus to rca
The blue wires is ground wire for experimentation.
If I use the blue wire for ground instead of ground to the cards on each side it's less hum. You can see a thermistor between chassis ground and power connection ground. The best solution is If I remove ground to each cards on the sides and connect one of the blue wire to chassisground and the other one to powersuply ground. Then it will be quit in one chanal and a litle bit hum in the other one.
The blue wires is ground wire for experimentation.
If I use the blue wire for ground instead of ground to the cards on each side it's less hum. You can see a thermistor between chassis ground and power connection ground. The best solution is If I remove ground to each cards on the sides and connect one of the blue wire to chassisground and the other one to powersuply ground. Then it will be quit in one chanal and a litle bit hum in the other one.
Attachments
Didn't notice this part before...that might be causing the ground loop. Since the Aleph is where the higher current circuits are keep the ground jumpers on that side and remove on the preamp side.
Hi,
It's two power boards, One for 24v plus and one for 24V minus.
I'ts ground jumpers between the boards. My idea is to remove these ground jumpers and ground each of the board to chassis ground, one directly and the other one with a CL60 thermistor. Then I will connect ground from the left power board to the left signal board and opposite with the right one. Is it possible to do like this? Then I will break the ground between left and right.
It's two power boards, One for 24v plus and one for 24V minus.
I'ts ground jumpers between the boards. My idea is to remove these ground jumpers and ground each of the board to chassis ground, one directly and the other one with a CL60 thermistor. Then I will connect ground from the left power board to the left signal board and opposite with the right one. Is it possible to do like this? Then I will break the ground between left and right.
I'm still working with the ground in Aleph J to keep it quiet. With XLR it's completely quiet, but with RCA it's noisy.
If I connect as shown in the picture, it will also be quiet when using RCA. I then connect ground from one XLR to chassis ground and from the other XLR to ground in the power supply. It's a CL60 thermistor between these ground points.
Are there any disadvantages to grounding this way?
If I connect as shown in the picture, it will also be quiet when using RCA. I then connect ground from one XLR to chassis ground and from the other XLR to ground in the power supply. It's a CL60 thermistor between these ground points.
Are there any disadvantages to grounding this way?
