So, i have a little issues that might need extra hands to get it right, last night I did power up my 300 VA toroidal and it is making a quiet buzz.
On smaller toroidals this usually means there is a short somewhere right, but in my case the buzz persists continuously with the transformer bolted down, or with bolt removed, at a different location, and with bridge+filters connected or not.
Does anyone know what might be causing this ?
On smaller toroidals this usually means there is a short somewhere right, but in my case the buzz persists continuously with the transformer bolted down, or with bolt removed, at a different location, and with bridge+filters connected or not.
Does anyone know what might be causing this ?
Many possibilities: a typical (but non-limitative) example: a hair-drier operating at half-power thanks to a series diode.
Many cheap soldering irons also use the trick.
The problem does not necessarily originates from your house: any neighbour on the same circuit could cause it
Many cheap soldering irons also use the trick.
The problem does not necessarily originates from your house: any neighbour on the same circuit could cause it
Does the unloaded transformer heat up excessively when powered for a while? Also, toroidals are sensitive to any DC component in the AC power because the magnetic paths are so good at what they do. Also, excessive capacitance on the rectifier output can cause that due to extreme current spikes on the charging cycles of the AC input waveform.
Try shutting off as many electrical appliances as possible. Does the noise change?
Or, take it to a different building and see what happens.
Or, take it to a different building and see what happens.
Search around on this site and learn about the potential bad habits of toroidal transformers; the topic has been discussed here a million times....
Okay, yes i am making some more research but there are two smaller toroidals (50VA and 80VA) which are not making this buzzing noise, unless you pull like 90% of their rated current. Also, there are two fluorescent tubes transformers which are making similar buzzing noise, I suppose for different reasons. The soldering iron station also buzzes when it heats. I presume all those symptoms are unrelated.
The buzzing is mechanical, something is vibrating.
Could it be the core is fragmented? Could it be there is a few loose windings ?
In either case could this mean the transformer is unsafe and a potential risk?
The buzzing is mechanical, something is vibrating.
Could it be the core is fragmented? Could it be there is a few loose windings ?
In either case could this mean the transformer is unsafe and a potential risk?