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Two Astrons 70's

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  #1  
Old 03-08-2009, 07:20 PM
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Default Two Astrons 70's


Someone told me you that it is possible to connect two Astron 70's together for running an amp that will draw 110 amps. Can anyone confirm that? And do I need any special connectors? I already have one and thought it may be the way to go.
Thanks
Gage


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Old 03-08-2009, 07:51 PM
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Originally Posted by glnelso View Post
Someone told me you that it is possible to connect two Astron 70's together for running an amp that will draw 110 amps. Can anyone confirm that? And do I need any special connectors? I already have one and thought it may be the way to go.
Thanks
Gage
Yes you can, sit one one top of the other and connect positives and negatives and you're set to go but what's gonna happen is the the ps with the lowest output will dictate the total output so you probably won't see double the amp output but it should be close and as far as connectors just use what the supply calls for from the power supplies to the device.

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Old 03-08-2009, 08:03 PM
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Cool, thank you.
Will I be able to determine my total amps used by checking both meters? Or will that number be compromised with that set up?

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Old 03-09-2009, 07:20 AM
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Quote:
Originally Posted by glnelso View Post
Someone told me you that it is possible to connect two Astron 70's together for running an amp that will draw 110 amps. Can anyone confirm that? And do I need any special connectors? I already have one and thought it may be the way to go.
Thanks
Gage
The voltage regulators in those things arent designed for current sharing.
The power supply with higher voltage output will dominate until it hits current limit.

You have two options:

1) if you run class C amp: you can simply not use regulation, get the power straight off the huge capacitors, which is before the regulator. Paralleling two power supplies are possible if both supplies have identical transformers and bridge rectifiers. Cannot use this on radio because its unregulated = high voltage at no load.

2) split the power feed on the amplifier.
Example: if you have a 4-pill amp, you could power two pills from one supply, and the other two from another power supply. DC feed in amplifier would need to be re-wired to isolate the connections. Both power supplies must be enabled/disabled together or you'll burn up the amp.

this is why tube amps are used for base-station

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Old 03-09-2009, 06:16 PM
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Quote:
Originally Posted by dudmuck View Post
The voltage regulators in those things arent designed for current sharing.
The power supply with higher voltage output will dominate until it hits current limit.

You have two options:

1) if you run class C amp: you can simply not use regulation, get the power straight off the huge capacitors, which is before the regulator. Paralleling two power supplies are possible if both supplies have identical transformers and bridge rectifiers. Cannot use this on radio because its unregulated = high voltage at no load.

2) split the power feed on the amplifier.
Example: if you have a 4-pill amp, you could power two pills from one supply, and the other two from another power supply. DC feed in amplifier would need to be re-wired to isolate the connections. Both power supplies must be enabled/disabled together or you'll burn up the amp.

this is why tube amps are used for base-station
Then what will he do when the imbalance caused by powering 2 different amp stages that are combined with different voltages and current draws?

Maybe he'll have to buy a balance resistor that will carry the imbalance after determining what the imbalance is.

Last edited by mackmobile43; 03-11-2009 at 08:11 PM.

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Old 03-11-2009, 05:23 PM
295 295 is offline
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Quote:
Originally Posted by dudmuck View Post
The voltage regulators in those things arent designed for current sharing.
The power supply with higher voltage output will dominate until it hits current limit.[/b]
Actually, my Astrons VS-70M has a special lug connector on the back to facillitate hooking up two of the big supplies in parallel, but I am not sure how it works. I would place a call to Astron and ask them about it...949-458-7277.

I know that some dealers advertise the ability to parallel the Astron supplies.

73

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Old 03-15-2009, 09:16 AM
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Default Thanks all

Thanks 295, sounds like a smart thing to do.
G

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Old 03-15-2009, 09:24 AM
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This is true, Astron actually comes with a "load sharing" feature, which causes their voltage to be equal, for near perfect load sharing. It is the spring connection, where you put the wire between both power supplys

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