Hoffman Amplifiers Tube Amplifier Forum

Other Stuff => Solid State => Topic started by: FranciscoPerez on February 24, 2011, 10:47:06 am

Title: Toroidal transformer in power supply.
Post by: FranciscoPerez on February 24, 2011, 10:47:06 am

Hi there,

I'm building a stereo lm1875 based amp for my ipod.
For the power supply, I have a 300VA toroidal transformer with 2x18v secondaries. It fits in the power supply enclosure without much space left, so I planned to place the psu circuitry on top of it. (Sry for the rough mspaint image).
Is it a good idea having the circuitry that close to the toroidal in that position? The magnetic field generated by the toroidal would perturb the rectified output signals?

(http://img218.imageshack.us/img218/1395/psudiag.gif)

Thanks very much in advance!!
Regards,
Francisco Pérez

Title: Re: Toroidal transformer in power supply.
Post by: PRR on February 24, 2011, 08:38:44 pm

> Is it a good idea

No.

Try it loose before you get too committed.

Title: Re: Toroidal transformer in power supply.
Post by: FranciscoPerez on February 25, 2011, 06:14:10 am

Thanks a lot PRR!
Then I'll probably change the enclosure, but what are de disadvantages of placing the board on top?
Where would you recommend placing the circuit board instead?