[sdiy] Matrix 12 PSU

[ASSI]

On Saturday 03 April 2004 12:25, Bert wrote:
> Does somebody know the output voltage (AC) of the power transformer
> of the matrix 12

Funny you should ask that. As nobody seemed to know the answer last 
week, I just had to measure it... Mine is putting out 18V~ to the SPS, 
primary current is around 380mA at 230V (this may not be correct due to 
higher harmonics, but I can't see the waveform at 7.5A/unit range and 
the next step down is unfortunately just 400mA), secondary current is 
2.7A, conduction angle about 45° both halves of the wave, with peak 
currents reaching just about 7.5A. 

So it appears that a 50VA toroidal transformer is a perfect, but 
somewhat tight fit (they are rated for 2x1.39A secondary @ 18V) and 
80VA should work well also, but with a bit higher output voltage as it 
would be loaded to just 60% of the rated power.


Achim.
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