centre tap or floating heaters?

lt cdr data · 22nd August 2006, 09:56 PM

which is best?

and bridge or full wave 2 diode recitication?

thanks

Geek · 23rd August 2006, 06:02 AM

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.

Tony · 23rd August 2006, 06:11 AM

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.

cm_ls1 · 23rd August 2006, 06:35 AM

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

22nd August 2006, 09:56 PM	#1
lt cdr data diyAudio Member Join Date: Dec 2003 Location: earth	centre tap or floating heaters? which is best? and bridge or full wave 2 diode recitication? thanks

23rd August 2006, 06:11 AM	#3
Tony diyAudio Member Join Date: May 2003 Location: Palatiw, Pasig City	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. __________________ http://www.electronicslab.ph/forum/i...?topic=32688.0

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23rd August 2006, 06:02 AM	#2
Geek diyAudio Member Join Date: Sep 2004	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.

23rd August 2006, 06:35 AM	#4
cm_ls1 diyAudio Member Join Date: Mar 2006 Location: AUs	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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