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Transformer coupling instead of cap?
Transformer coupling instead of cap?
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Old 1st April 2014, 05:50 PM   #1
777funk is offline 777funk  United States
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Default Transformer coupling instead of cap?

If I have a transformer on the last stage of a line level circuit (essentially a pre) can I use a non gapped transformer instead of a cap to block the DC?

...for example in an opamp circuit where there would be around 2-3 VDC on the output pin measured to ground.

Is a gapped core always necessary if there's going to be any amount of DC?


Similar question, how does a gapped core effect the sound?
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Old 1st April 2014, 08:25 PM   #2
PChi is offline PChi  United Kingdom
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There are many interdependent parameters.
A gapped core isn't essential for DC.
A gapped core might be used because there is a limit to the maximum flux density that a core can take before saturating where the distortion will increase badly that wont sound good and the inductance drops loosing bass.
Using a gapped core means that more turns need to be used for the same magnetizing inductance which increases the winding resistance which reduces the current so reducing the flux density so less of problem with the bass but higher leakage inductance between the windings so the treble suffers.
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Old 1st April 2014, 11:16 PM   #3
sreten is offline sreten  United Kingdom
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Hi,

Its a very poor solution to the problem. Redundant
if the driven input is AC coupled, and nearly all are.

rgds, sreten.
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Old 1st April 2014, 11:28 PM   #4
777funk is offline 777funk  United States
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This is true but even so you usually don't see audio outputs with DC on them in commercial equipment. Isn't it considered bad practice have have DC voltage on an output to the real world?
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