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Old 6th April 2004, 08:59 PM   #11
piewie is offline piewie  Belgium
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i still have got a slight humm when both amplifiers are switched on and connected to the same source. How could i best solve this.
No hum whatsoever with only one channel switched on.
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Old 6th April 2004, 09:54 PM   #12
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Location: Ruhrgebiet
Sounds like a ground loop effect.
Both amps connected to the same wall mains outlet?
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Old 6th April 2004, 10:07 PM   #13
piewie is offline piewie  Belgium
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both are indeed connected to the same outlet and are grounded.
It is indeed a grounding problem, question is how will i solve this.
I still have 4 VDR's laying around. Would it be wise to connect the supply gnd with these to the starground of the monoblocks.

Specifications

* operating voltage:
o Vac: 50V
o Vdc: 65V
* type: S20K
* dimensions:
o D: 22.5mm
o T: 4.5 .. 5.3mm
o d: 1.0mm
* pitch:
o e: 10mm
* response time: < 25ns (< 10ns with SMD varistors)
* electric strength: 2.5kV
* insulation resistance: > 1Gohm
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Old 7th April 2004, 12:51 PM   #14
piewie is offline piewie  Belgium
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Solved the problem with inserting a 5W 100ohm resistor between star ground and ac gnd connection of one monoblock. Now the ground loop has disappeared.

picture of finished project.
I'll anodise them later

Click the image to open in full size.
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Old 7th April 2004, 01:43 PM   #15
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piewie,

Great job, nice pair...

Alain.
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