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Digital oscilloscope project/kit

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RobWilson:
My bad John

I copied wrong part number    :Doh:    , I meant this one   p#   312-612   12 - 0 - 12 3A 72VA Chassis Transformer   

So you reckon the op amps need upgrading , any recommendations mate . 

Rob
 

RobWilson:
Anyway to small ,   why use VA ?    is VA just Watts ? 


volts  x amps .


Rob

awemawson:
VA is WATTS with the Power Factor taken into consideration. Power Factor relates to the way the phase of the voltage and current vary. Typical PF of a motor is 0.8


https://en.wikipedia.org/wiki/Power_factor

http://www.power-solutions.com/watts-va

RobWilson:
Hi Andrew


so if an electric motor was    240v x8A x 0.8 pf =  1536 VA or near enough 1.5Kva  ,  any idea what the power factor of a transformer would be ?  is that another can of worms lol


Rob 

awemawson:
Big transformers have PFs nearer to unity whereas little ones can be as low as 0.5 - it depends how much trouble they went to designing the magnetic circuit

http://www.the-power-factor-site.com/Transformer-Capacity.html

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