1:1 transformer replace with line filter

kipman725 · 19th August 2009, 12:40 AM

Hi for my HT supply I have a 1:1 transformer however it seems abit rubbish as even at 100VA it causes a very nasty transient in my other amplifier plugged into one of the rooms same sockets. It also seems to have a huge radiated field that's causing mains hum issues. This has me thinking, if the only reason for using 1:1 transformers is for protection against mains bourne transients and to prevent a device injecting noise onto the power line then can't I just replace the transformer with a line filter?

The transformer is enclosed in a steel case that is grounded to mains earth so I don't think there is any safety implications from this.

Wavebourn · 19th August 2009, 01:10 AM

Looks like it has an interwinding short.

leadbelly · 19th August 2009, 01:41 AM

Quote:

Originally posted by kipman725
This has me thinking, if the only reason for using 1:1 transformers is for protection against mains bourne transients and to prevent a device injecting noise onto the power line then can't I just replace the transformer with a line filter?

That's not even close to being the reason. They are there for galvanic isolation, an absolute must for safety.

19th August 2009, 12:40 AM	#1
kipman725 diyAudio Member Join Date: Jun 2007 Location: London/N.lincs	1:1 transformer replace with line filter Hi for my HT supply I have a 1:1 transformer however it seems abit rubbish as even at 100VA it causes a very nasty transient in my other amplifier plugged into one of the rooms same sockets. It also seems to have a huge radiated field that's causing mains hum issues. This has me thinking, if the only reason for using 1:1 transformers is for protection against mains bourne transients and to prevent a device injecting noise onto the power line then can't I just replace the transformer with a line filter? The transformer is enclosed in a steel case that is grounded to mains earth so I don't think there is any safety implications from this.

19th August 2009, 01:10 AM	#2
Wavebourn diyAudio Member Join Date: Sep 2006 Location: Pleasant Hill, CA	Looks like it has an interwinding short. __________________ The devil is not so terrible as his mathematical model! Wavebourn: We Create Creativity!

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