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Old 3rd October 2003, 11:43 AM   #1
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Question About my amps mains connections

I知 building an amp with four channels I one box (For biamping and/or bridging)

For the power supply I値l be using 2*500 VA torrid transformers. But the question is how to do the mains cabling?

I have a capacitorbank of 240mF that needs to get started when I turn on the amp. This made me think about how you all make the connection on the primary side of your transformers on bigger amps.

I also wonder about what type of switches you use for your mains?

My plan is to have a stand by 12 V inside the box to power a series of relays for the mains and amp output relays. The mains will run thru a series resistor to the primary side of the transformer, and after a second or so this resistor will be shorted out to make the mains be coupled directly to the primary side of the torrid.

I知 making an interface to connect the amp to my B&O preamplifier; this controls power up and muting of the amp. This could also be used to control the amp via some small switches and there by not having to worry about high current switches?

Any comments and ideas are welcome

Thanks

\Jens
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Old 4th October 2003, 09:56 AM   #2
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try rod elliots site
at www.sound.au.com
project 39- soft start circuit
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Old 4th October 2003, 11:11 AM   #3
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Essentially it places a few resistors before the trafo and then shorts it out a couple of seconds later using a relay...you do have to get a long-life relay though...
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Old 4th October 2003, 11:50 AM   #4
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i your transformers are very bigu can give it some time before shorting it , then the relay will last longer
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Old 4th October 2003, 12:31 PM   #5
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Default Delay for shorting the resistors

Thanks for the info on the ESP page,

I have made a 1ス second delay before the resistors are shorted.

Don't you worry about this stuff when you build amps?

\Jens
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Old 4th October 2003, 12:40 PM   #6
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i'm using relays too
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Old 4th October 2003, 12:55 PM   #7
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Guess there are no better ways...only a clean relay will do...
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Old 4th October 2003, 01:39 PM   #8
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You only need 0.1-0-5 s for the delay (a couple of periods) but up to 1 sec is OK. I have around 0.2 sec only for 600 VA transformer. This helps the fuses not blowing.
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Old 4th October 2003, 01:45 PM   #9
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How about a full revised schematic with all the component values and a simple layout??
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Old 4th October 2003, 02:24 PM   #10
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Default PCB and schmatics

I have a prototype PCB (single sidet) working, will post the final result incl. pictures when I have it.

\Jens
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