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Active/Passive and Battery Drain

 
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RJMiller



Joined: 17 Feb 2006
Posts: 4
Location: Minnesota

PostPosted: Tue Mar 21, 2006 4:18 am    Post subject: Active/Passive and Battery Drain Reply with quote

I have a Skjold with active/passive electronics.

Am I correct that the system turns on and the battery is being used as soon as the amp cord is plugged in, even if the amp isn't turned on?

If the active/passive knob is pulled out to put the bass in passive mode, is the battery still being drained if the amp cord is plugged in? I'm asking because I thing it would be easier to pull out the active/passive knob than to disengage the jack lock and pull out the chord when I'm not going to play the bass for awhile.

Hope this hasn't been discussed before and I missed the thread. Thanks for your reply.

RJM
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RJMiller



Joined: 17 Feb 2006
Posts: 4
Location: Minnesota

PostPosted: Thu Apr 20, 2006 12:01 pm    Post subject: Reply from John East Reply with quote

From:
John E Retro - East UK <john_e_retro@btinternet.com>

Subject:
Re: Battery Drain in Passive Mode?

Date:
Thu, 20 Apr 2006 07:56:14 +0100


Hi Dick

The Question:
> My bass has an active/passive pull knob. If the bass is in passive
mode is there battery drain when ever a chord is plugged into the send
jack (as there is in active mode)?

John's Answer:
Yes, the active/passive pull pot does not switch off the battery. The reason
is because as the power is switched on and off, a huge transient thump is
caused, just as when you might inadvertently plug the jack into an active
bass, when your rig is live.

This is caused by the power surge into the preamp on switch on, and the
power drain on switch off. To switch the power silently would require some
sort of soft start or mute circuit whilst the DC conditions stabilise. You
often get relay circuits in power amps and hi-fi units, where the speakers
aren't switched on until the power has settled, that's the sort of thing I'm
talking about.

The other way to do it is with a 3 stage switch, passive, standby and
active, where the power settles down in the standby setting, but that
requires a toggle.

Get back to me if you have any further questions?

Thanks

John
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