Confused about transformers

billybob66 · 12th March 2009, 05:38 PM

I have a toroidal transformer with dual (30v) secondaries for my power supply (Hammond 182P30) I'll be using a single bridge rectifier into four large caps. I'm thinking the "hot" side of each secondary wires to the rectifier, and the neutral wires connect to the ground plate between the caps. Is this correct?

DougL · 12th March 2009, 05:44 PM

A drawing would be priceless in this instance.

The answer as it stands is "I think so, but I am not sure"

Doug

audiofan · 12th March 2009, 06:07 PM

According to hammond documentation

blue & gray link and used as center tap

red to rectifier

yellow to opposite side of rectifier

leadbelly · 12th March 2009, 06:08 PM

Quote:

Originally posted by billybob66
I'm thinking the "hot" side of each secondary wires to the rectifier, and the neutral wires connect to the ground plate between the caps.

There is no such thing as a neutral secondary, unless you've done something wrong like wired one of the secondary's leads back to the mains neutral.

AndrewT · 12th March 2009, 06:13 PM

post3 shows the tapping to ground between the caps and the centre tap.
No, take the tapping from the junction of the caps to the main audio ground.

The current passing along the centre tap to the caps is in short duration high current spikes. Don't let this contaminate your main audio ground.

audiofan · 12th March 2009, 06:18 PM

The post was only to give correct color and phase for transformer not layout or ground loops.

leadbelly · 12th March 2009, 06:54 PM

Quote:

Originally posted by audiofan
The post was only to give correct color and phase for transformer not layout or ground loops.

I agree. AFAIK schematics were never intended to convey layout instructions.

billybob66 · 12th March 2009, 10:01 PM

Thanks for the info, Audiofan....I hate to be guessing when it comes to this stuff!

AndrewT · 21st March 2009, 01:29 PM

I would hate to be reading an obituary because someone was too embarrassed to ask.

Fools go in uninformed.
The rest of us survive.

12th March 2009, 05:38 PM	#1
billybob66 diyAudio Member Join Date: Mar 2008	Confused about transformers I have a toroidal transformer with dual (30v) secondaries for my power supply (Hammond 182P30) I'll be using a single bridge rectifier into four large caps. I'm thinking the "hot" side of each secondary wires to the rectifier, and the neutral wires connect to the ground plate between the caps. Is this correct?

12th March 2009, 05:44 PM	#2
DougL diyAudio Member Join Date: Feb 2004 Location: Wheaton IL. Blog Entries: 28	A drawing would be priceless in this instance. The answer as it stands is "I think so, but I am not sure" Doug __________________ Scienta sine ars nihil est - Science without Art is nothing. (Implies the converse as well) Mater tua criceta fuit, et pater tuo redoluit bacarum sambucus

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12th March 2009, 06:13 PM	#5
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	post3 shows the tapping to ground between the caps and the centre tap. No, take the tapping from the junction of the caps to the main audio ground. The current passing along the centre tap to the caps is in short duration high current spikes. Don't let this contaminate your main audio ground.

12th March 2009, 06:18 PM	#6
audiofan diyAudio Member Join Date: May 2003 Location: quebec	The post was only to give correct color and phase for transformer not layout or ground loops.

12th March 2009, 10:01 PM	#8
billybob66 diyAudio Member Join Date: Mar 2008	Thanks for the info, Audiofan....I hate to be guessing when it comes to this stuff!

21st March 2009, 01:29 PM	#9
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	I would hate to be reading an obituary because someone was too embarrassed to ask. Fools go in uninformed. The rest of us survive.