Ground connection
Hello,
who can help me ?
I have built a six channels integrated amplifier. I have put only one transformer outside the main box. I have put the preamplifier psu with its low power transforer inside then main box. So I have two PSUs. How and where can connect the then 0V reference of the two PSU?
When you have two power supplies and six signal ground from amplifiers , six signal ground from preamplifier plus two 0V grounds from PSUs , what's the best way in order to reduce the 50Hz hum ?😕
... and the security earth point ?
Thank-you. MATTEO
Hello,
who can help me ?
I have built a six channels integrated amplifier. I have put only one transformer outside the main box. I have put the preamplifier psu with its low power transforer inside then main box. So I have two PSUs. How and where can connect the then 0V reference of the two PSU?
When you have two power supplies and six signal ground from amplifiers , six signal ground from preamplifier plus two 0V grounds from PSUs , what's the best way in order to reduce the 50Hz hum ?😕
... and the security earth point ?
Thank-you. MATTEO
When doing the ground layout there are several things to consider. The most importat step is to make sure that every circuit only has one ground return, to avoid creating ground loops. Also, each wire and it's respective ground return should be kept as close as possibel to avoid creating big current return loop areas - these pick up noise and the signal wires are specially sensitive to this. Anyway, for further reading see:
Fun with Tubes
Go to the "eliminating ground loops" section.
Fun with Tubes
Go to the "eliminating ground loops" section.
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