ARCHIVED FORUM -- March 2012 to February 2022READ ONLY FORUM
This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022
Peter Pan: Solder Pin 2 and Pin 7 together to ensure enough ground. Too little ground provides noise.
Solder Pin 2 and Pin 7 together to ensure enough ground. Too little ground provides noise.
Be carefull with making more groundings than necessary. Groundloops are caused by these, with unwanted noise as result.
Peter Pan: Trigger flow is from > 2.5 Volts DC. to < 5.0 Volts DC.
Trigger flow is from > 2.5 Volts DC. to < 5.0 Volts DC.
There is no need to restrict the triggervoltage to 5.0 V maximum. No zener is needed for that. Will result in unnecessary powerdissipation.
If a zener is used for protection, use one for 15V. When 12V is applied to the triggerinput, only 9mA will flow through the 22K resistor to the base of the transistor for triggering used. Almost negligible..
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Well, you could read the answer in one of the postings. "Using a 12V trigger".
So, it will work. But if the beolab stays on to long (after switching the receiver off), then I would suggest a resistor parallel to the triggersupply for discharging the outputcapacitor. Which value depends on the capacity of it.
Start experimenting.
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tuttivini:Ps: I don't hear it when I listen to music. Audio quality is good (as good as it gets with relative simple 6000's...) But I just don't like the fact that they make some sort of noise, hearable from the tweeters (max 20cm's away), when they are on and no music is playing. Is this called 'white noise'?
I don't know, but... why not take the easy solution, and stop listening to your speakers from 20 cm away when no music is playing?
--mika
tournedos: tuttivini:Ps: I don't hear it when I listen to music. Audio quality is good (as good as it gets with relative simple 6000's...) But I just don't like the fact that they make some sort of noise, hearable from the tweeters (max 20cm's away), when they are on and no music is playing. Is this called 'white noise'? I don't know, but... why not take the easy solution, and stop listening to your speakers from 20 cm when no music is playing?
I don't know, but... why not take the easy solution, and stop listening to your speakers from 20 cm when no music is playing?
Patient: Doctor, doctor, it hurts when I do this!
Doctor: So? Don't do that!
Jeff
I'm afraid I'm recovering from the BeoVirus.
Sorry, had some actual info too... I just listened to my BL8000s (connected to a BC9500 with Powerlink cables). Yes they hiss a little, and might have slight hum as well. I don't care a bit.
BeoNut since '75
tuttivini:Is this on ALL beolabs? Other forum members who can/want to check this on there systems?
I have 4000 and 8000, have had these connected line and with PL never had any "his" and has had these connected to different amps as well
Collecting Vintage B&O is not a hobby, its a lifestyle.
I had problems with one of my 4000s (hum) but never a "his", and when repaired I started to get nervous about the other speakers, no sound what so ever from any when in standby.When there was no sound from amps, the speakers turned off after 30-60 sec. after that no sound. Even before going into standby, no sound.
What happens if you shorten the input while powered up?
Be aware of the fact that thes are just analog amplifiers without any volumecontrol in itself. So, even the slightest noise or hum picked up, or caused by cables are amplified. So, it might even be caused by the internal cross-over filter.
And there is a difference between audiophile and just creating something without any purpose. If you can't hear the noise from a distance, don't bother.
tuttivini:What do you mean with 'shorten the input'? Isn't this harmful for the beolabs?