STEPS and amveco transformers

[fergie232]

im looking at building the STEPS power supply as detailed on tagent's website
i was just wondering, im looking to use the Amveco series of pc mount transformers, as specified on the website
i was looking at the 25VA series,
the 12V one in particular,
and i was wondering - on the website it says the output is 2x12 volts at 1041mA
does this mean that when using both DC outputs in series, the mA is halved?
as in, 24VDC at 520.5mA?
thanks for any help
-fergie

 

[tangent]

No. 24 V * 1.041 A = 25 VA That's one of the main reasons transformers are specified primarily in VA terms to begin with...because they don't know exactly which arrangement you will use, so they just specify the power.

 

[fergie232]

ahhhhhhh thanks alot tangent

silly me lol
so if its 24V at 1.041 A, does that mean i can daisy chain another power output, and have two 24VDC outputs at 520.5mA?
does 24VDC@520mA sound like enough to power a millet or say a PPA?
cos thats what im thinking of doing, wiring in two power out jacks
and running two amps off it (at same time)
your thoughts?
-fergie

 

[Jam_Master_J]

Quote:

Originally Posted by fergie232 /img/forum/go_quote.gif ahhhhhhh thanks alot tangent silly me lol so if its 24V at 1.041 A, does that mean i can daisy chain another power output, and have two 24VDC outputs at 520.5mA? does 24VDC@520mA sound like enough to power a millet or say a PPA? cos thats what im thinking of doing, wiring in two power out jacks and running two amps off it (at same time) your thoughts? -fergie

520.5mA is plenty for either amp. Remember though, all the power supplied by the transformer is not supplied to the load, there are losses in the circuit. A Millet should draw in the range of around 250mA.

 

[fergie232]

my electronics knowledge really fails me sometimes lol
i have a question
im thinking of building a STEPS with 3 power outs, all 24VDC@~340mA
there'll probably be little chance of me ever running all 3 amps at once
lol
so if i have 3 power outs wired together, and i turn the STEPS on,
even tho only one amp is being powered (load of about 250-300mA)
would that amp receive the full 1A or so of power the transformer has to offer?
granted there is some lost in the circuit
but would it only get ~340mA or would it get the full ~1A or so? (probably a stupid question but im a noob

)
also, does it make a difference if the power-out jacks are wired in series or parallel?
thanks for all your help so far
-fergie

p.s. also, how much current does a PPA or M3 draw?

 

[Jam_Master_J]

Wire the jacks in parallel. And don't worry about designating a certain current to each output, just ensure that the total doesn't exceed the supply.