Dear forum,
My problem is that I want to eliminate switching noises from light switches into my power supply - and finally to my speakers.
Initial situation:
Power Supply: (from mains 230V in, to DC out +/- 35VDC)
1.) Mains Inlet Filter Schurter FKH 4304.4003 Medicinal Version (http://www.schurter.se/pdf/german/typ_FKH.pdf)
2.) 500VA Noratel Toroid Transformer (Encapsulated Series)
3.) Two Rectifier Bridges (35 Amp. Glass Passivated Bridge Rectifier (Fagor FB 3510)
4.) Fuse
5.) Smoothing caps (2 x 47’000 uF per Rail)
6.) Filtering Caps (2 x 1000uF, 2 x 100 uF 2 x 10 uf, 2 x 0.1 uF) per Rail
Problem:
I can hear switching noises thru my speakers when lights are turned of by light switch or for example also by taking of an electric iron power plug from mains and …
Till now I installed a 0.1uF/630V cap in parallel after the Mains Inlet Filter and in front of the Toroid Transformer. It helped a little bit, but the switching noises are still present.
How can I eliminate those switching noises ? Any opinions ?
Where can i find a frequency spectrum of such a noise to design a filter for it ?
Thanks in advance
artQuake
My problem is that I want to eliminate switching noises from light switches into my power supply - and finally to my speakers.
Initial situation:
Power Supply: (from mains 230V in, to DC out +/- 35VDC)
1.) Mains Inlet Filter Schurter FKH 4304.4003 Medicinal Version (http://www.schurter.se/pdf/german/typ_FKH.pdf)
2.) 500VA Noratel Toroid Transformer (Encapsulated Series)
3.) Two Rectifier Bridges (35 Amp. Glass Passivated Bridge Rectifier (Fagor FB 3510)
4.) Fuse
5.) Smoothing caps (2 x 47’000 uF per Rail)
6.) Filtering Caps (2 x 1000uF, 2 x 100 uF 2 x 10 uf, 2 x 0.1 uF) per Rail
Problem:
I can hear switching noises thru my speakers when lights are turned of by light switch or for example also by taking of an electric iron power plug from mains and …
Till now I installed a 0.1uF/630V cap in parallel after the Mains Inlet Filter and in front of the Toroid Transformer. It helped a little bit, but the switching noises are still present.
How can I eliminate those switching noises ? Any opinions ?
Where can i find a frequency spectrum of such a noise to design a filter for it ?
Thanks in advance
artQuake