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Old 4th August 2006, 05:33 PM   #1
ash_dac is offline ash_dac  United Kingdom
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Default Bridge rectifier - confusion

Hi,

I am drawing up a parts list for a gainclone, and will probably go for a bridge rectifier configuration.

The bridge rectifier has two ac inputs, and a negative / positive output.

Do I need dual secondaries and two rectifiers for +- supply ?

Also does the negative need to be grounded to centre tap ?

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Old 4th August 2006, 05:44 PM   #2
poobah is offline poobah  United States
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Quote:
Do I need dual secondaries and two rectifiers for +- supply ?
You need dual secondaries, OR, 1 center-tapped secondary. You do not need 2 bridge assemblies. In the case of dual secondaries, you will need to carefully observe the "phasing" when creating your center tap. The "dotted" end of one secondary must connect to the UNdotted end of the other.

Draw 2 cap in series where you presently show one. Connect the center tap to the node (junction) between the two caps.

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Old 4th August 2006, 05:50 PM   #3
poobah is offline poobah  United States
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Old 4th August 2006, 05:57 PM   #4
ash_dac is offline ash_dac  United Kingdom
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Quote:
Originally posted by poobah


You need dual secondaries, OR, 1 center-tapped secondary. You do not need 2 bridge assemblies. In the case of dual secondaries, you will need to carefully observe the "phasing" when creating your center tap. The "dotted" end of one secondary must connect to the UNdotted end of the other.

Draw 2 cap in series where you presently show one. Connect the center tap to the node (junction) between the two caps.


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Thanks.

Should that node between the two caps become the star earth ?
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Old 4th August 2006, 06:02 PM   #5
poobah is offline poobah  United States
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Actually, that precise point will have large currrents flowing through it. Some short piece of wire should go from that point to the "star"

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Old 4th August 2006, 06:08 PM   #6
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Default this would work

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Old 4th August 2006, 06:10 PM   #7
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