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Multi-Way Conventional loudspeakers with crossovers

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Old 27th July 2004, 03:29 PM   #11
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Location: Fort Worth, Texas
I've been using Marchand Active crossovers for years, they do have a little thump, but nothing like what you describe. I find the best way to deal with this is to never turn off the crossover, mine's been on continuously for about 3 years, no reason to ever turn it off, in fact my amps are always on as well.
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Old 27th July 2004, 03:32 PM   #12
tiroth is offline tiroth  United States
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He is concerned about power failure.
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Old 27th July 2004, 03:42 PM   #13
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Konnichiwa,

Quote:
Originally posted by paulb
I don't recommend the 555. Here's an appropriate circuit from the renowned Rod Elliot: http://sound.westhost.com/project104.htm
The function of this is indentical to the 555 Based circuit with more parts and a less accurately defined trigger voltage and timing. But yes, it will work fine. As remarked, you can do the same thing in many ways, including fully discrete.

The essence is the following operation:

1) The circuit has a turn on Delay (a few seconds).
2) The circuit once turned on will switch off within in a very short time span (<< 100mS), unless re-triggered by an external pulse signal (eg. AC from the secondary of the mains transformer via a diode).
3) The trigger level is clearly defined such that if the the supply (AC) voltage drops below a certain level (brown out) the relais is released instantly.

The 555 can be set up as having very few added components in this operation and as doing it reliable and without significant supply voltage and thermal drifts of parameters. In that it is superior to either Rod Elliotts design or my old discrete one, though all will work just fine in practice.

Sayonara
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Old 27th July 2004, 08:45 PM   #14
AJ is offline AJ  United States
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Thanks everyone for the input - I'll know more about what to look for in the next one I buy.

In the meantime, the UPS looks to be a reasonable solution for me.

Best,
Allan
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