Dr.EM said:I remember you mentioning the earth lifing, but when I tried it it was even worse doing it that way? The buzzing got louder with the increasing volume instead of remaining low all the time.
It's here he seems to make a point of earthing the 0v secondary line;
**broken link removed**
where as you say it is safe not to do so with those transformers? I would definately earth any metal chassis and that doesn't seem to cause any problems, but it's the 0v line that can.
EDIT: Also, how is it that the bridge in the breaker circuit doesn't pass any current except in the event of a fault? Because the voltage is nominally too low to overcome the diode drops in a normal earth loop so the current flows through the 10ohm resistor instead?
Oh yeah, another thing. My own bought amplifier (Rotel RA01) is in a metal case, yet it can't possibly have any earth since it connects via a 2 pin inlet. How is it that is "safe"?
Dr.EM said:How would you go about making a class 2 appliance then? You'd presumably require a special transformer, which those Rapid ones are not? I can't feel any charge on the amp, but it collects a lot of dust
Nigel Goodwin said:You seem to have an obsession with 'special' transformers?, the Rapid ones should be fine - most class II audio systems use really cheap and nasty Chinese transformers.
Hero999 said:Double insulated transformers are always wound on double section safety bobbins whist class I designs the primary and secondaries are all wound on a single section bobbin.
All of the above applies to transformers with lamimated E-cores. I don't know about torroidial types, it might depend on the degree of insulation between the primary and secondaries.
grim said:Class III - only generates low voltages.
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?