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Re: design power supply 240vac to 12vdc (uper 350ma)
To convert 240Vac to 12Vdc,definitely u will need a transformer.When we design a power supply system,we should and must take safety(to power source,cascades after the power supply,even human body) into consideration.
sorry. my words are confusing.i thought the wire between two component as a node just now. How ridiculous！
And i didn't misunderstand ur ansewr,i just misunderstood the KCL's Law(2 nodes,OMG...)
thx anyway,for pointing out the mistake
Lvw,
i think u r righti. i guess it's not correct to include two different nodes when using Kirchhoff's Law in most cases.
And i'm really appreciated for ur help:smile:
haha^.^
i replaced the eq2 as (Vi-Vt)/R3=Vt/(1/sC1)+Vt/R2+(Vt-Vo)/R3,then the result turned right.
but i still can't understand why i can't use the previous eq2,since there is current flowing into the negative input of the op-amp under ideal circumstances:???:
LvW,
thx for pointing out the mistake
actually,it's my typo.it should be (Vi-Vt)/R3=Vt/(1/sC1)+(Vt-Vo)/Rp,where Rp=R1//(R2+1/sC2)
and i didn't get the same answer as TI's.
regards
lizardno1
i am working on some filter topologies,trying to figure out how these filters work.and in a TI's application report ,i find the MFB filter circuit
the Laplace transfer function given by the document is
however,the Laplace tranfer function derived by myself dosen't match the one above,and i'm...
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