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3rd October 2003, 11:43 AM
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#1 |
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diyAudio Member
Join Date: Jul 2002
Location: Denmark - Jutland
 
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About my amps mains connections
I’m building an amp with four channels I one box (For biamping and/or bridging)
For the power supply I’ll 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’m 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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4th October 2003, 09:56 AM
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#2 |
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diyAudio Member
Join Date: Jul 2003
Location: Israel , haifa
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4th October 2003, 11:11 AM
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#3 |
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diyAudio Member
Join Date: Jun 2003
Location: Woodlands Circle
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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...
__________________
Kids in the back seat cause accidents...Accidents in the back seat cause kids... |
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4th October 2003, 12:31 PM
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#5 |
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diyAudio Member
Join Date: Jul 2002
Location: Denmark - Jutland
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Delay for shorting the resistors
Thanks for the info on the ESP page,
I have made a 1½ second delay before the resistors are shorted. Don't you worry about this stuff when you build amps? \Jens |
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4th October 2003, 01:39 PM
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#8 |
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Electrons are yellow and more is better!
diyAudio Member
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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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/Per-Anders (my first name) or P-A as my friends call me Tube Buffered Gainclone in work |Thread |
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4th October 2003, 02:24 PM
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#10 |
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diyAudio Member
Join Date: Jul 2002
Location: Denmark - Jutland
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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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