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Planar Speaker Asylum Welcome! Need support, you got it. Or share your ideas and experiences. |
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In Reply to: Satie, I don't think my preamp has posted by rrob on August 14, 2010 at 15:08:32:
I looked at the schematic and the pics of the assembled pre. There is indeed an output cap, so I guess his simplified power supply is the cause, as it may leak current into the signal path and cause the coupling cap to charge rapidly and create a thump, and the signal ground can also introduce pops from the power supply at turn on if there is no control of its hookup prior to stabilization.
That said, your own Threshold experimentation shows that it is responsible for the DC at turn on, so you must have a cap in series with the Threshold's output. At least until you have a service tech deal with the issue.
An active line level crossover may prevent your preamp's start up spike - depends on the wiring, but a passive line level crossover will not do it because ground will be direct coupled and we suspect the ground to be a conduit for the DC.
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Follow Ups
- RE: Satie, I don't think my preamp has - Satie 16:02:24 08/15/10 (2)
- RE: Satie, thanks for checking - rrob 16:33:04 08/15/10 (1)
- RE: Satie, thanks for checking - Davy 17:34:21 08/15/10 (0)
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