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Old 22nd August 2006, 09:56 PM   #1
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Default centre tap or floating heaters?

which is best?

and bridge or full wave 2 diode recitication?

thanks
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Old 23rd August 2006, 06:02 AM   #2
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Hi,

I've used centre tap as well as floating w/one leg grounded with a 'lytic cap (2.2-4.7uF) in mic stages, where noise is very noticeable. I'd say there's at best a 6dB favor for the centre tap. However, if you tie the heaters to say, +30V, there seems moot difference between the methods.
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Old 23rd August 2006, 06:11 AM   #3
AJT is offline AJT  Philippines
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a two diode full wave bridge has one side of the transformer cut-off, doing nothing, at reverse phase.

a 4 diode full wave bridge otoh uses the full secondary winding at all times, therefore in terms of transformer utilisation is better the the 2 diode ones.
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Old 23rd August 2006, 06:35 AM   #4
cm_ls1 is offline cm_ls1  Australia
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i found

referencing the centre tap of the heater to 1/4 b+ with a voltage divider coupled to earth the quietest .

next best was grounding the CT

and floating produced quite a bit of hum

this is with ac heaters
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