Electromagnetic Influence

fmak · 9th January 2004, 09:24 PM

I have just learnt a big lesson in the effect of LF EM waves. Trying to improve the power supply of a Swissonic ADC (seems very well designed), I was getting some very shrill sounds when I added decoupling capacitors to the analogue and digital rails. Replacing the wall plug with a substantial toroid made matters worse.

By accident, I had switched on a LF EMC detector and found moderate readings close to my ADC and DAC which had their seperate transformers placed some 10cm from the edge of their boxes.

Moving these away until I couldn't get a reading restored sonics to normality and I am most annoyed as I now need to spend several days evaluating the PS again!

The whole situation is reproducible

Does anyone else have the same experinece? It seems that my transformers need to be at least 20-30 cm away from the boxes!

9th January 2004, 09:24 PM	#1
fmak diyAudio Member Join Date: May 2001 Location: London UK	Electromagnetic Influence I have just learnt a big lesson in the effect of LF EM waves. Trying to improve the power supply of a Swissonic ADC (seems very well designed), I was getting some very shrill sounds when I added decoupling capacitors to the analogue and digital rails. Replacing the wall plug with a substantial toroid made matters worse. By accident, I had switched on a LF EMC detector and found moderate readings close to my ADC and DAC which had their seperate transformers placed some 10cm from the edge of their boxes. Moving these away until I couldn't get a reading restored sonics to normality and I am most annoyed as I now need to spend several days evaluating the PS again! The whole situation is reproducible Does anyone else have the same experinece? It seems that my transformers need to be at least 20-30 cm away from the boxes!

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
beta influence	maxpou	Solid State	2	27th August 2007 11:38 AM
I/V - op amp offset influence on DAC performance ?	Bernhard	Swap Meet	1	4th September 2005 08:45 PM
Replace the field coil spk with Electromagnetic dynamic spk	pioneervn	Tubes / Valves	6	3rd July 2005 03:48 PM
Electromagnetic Speakers	djdan	Multi-Way	23	19th July 2004 12:40 AM
Motionless Electromagnetic Generator	jcarr	Everything Else	7	11th May 2003 02:03 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)