Re: Behaving like undervoltage?
- From: Pooh Bear <rabbitsfriendsandrelations@xxxxxxxxxxx>
- Date: Fri, 30 Sep 2005 21:52:22 +0100
Anahata wrote:
> apa wrote:
> > I went into my studio last night to find a dim overhead light and my 4
> > RNC's buzzing like a vibrating cellphone in a pile of bottlecaps.
>
> It has a bypass relay that comes on when you power it up.
> Under low supply voltage, the power supply regulator will drop out of
> regulation and the ripple will appear on the power rails, hence the
> relay chatter (most likely guess anyway).
>
> > and the sound stops. Then I notice that many of the peak lights are on
> > on the board. The record light has come on on the tape deck (it usually
> > doesn't light unless the transport is engaged). There is a hum through
> > the monitors and the only other piece of gear that's powered up (an
> > Orban 642) is peaking on one channel and peaking about once a second on
> > the other channel.
>
> The control logic will get into all sorts of funny states if its power
> supply has big ripple and sub-spec level because of lack of regulation.
>
> Same with analog audio circuits - when the rails drop out of regulation
> that ripple will find its way into the audio chain.
No point me repeating everything you posted.
So - yes - that explains the observed symptoms.
Graham
.
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