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Old 13th March 2004, 02:28 PM   #1
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Default Di box

Is a DI box mearly a transformer? If so what impeadence? Do active DI boxes have any advantage?
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Old 13th March 2004, 02:32 PM   #2
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A DI box is nothing but an isolation transformer.
Active isn't a good idea. You really need the isolation to avoid ground loops.
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Old 13th March 2004, 02:35 PM   #3
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They're usually 600:600 ohm transformers for line level sources.
Bridging transformers (10k:10k) will also work.
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Old 13th March 2004, 07:08 PM   #4
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Stupid thing is: I have searched the maplins site and RS components for "matching", "1:1", "600", and "10k" . Nothing
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Old 13th March 2004, 07:58 PM   #5
usekgb is offline usekgb  United States
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A DI box converts a high impedence unbalanced instrument signal to a low impedence balanced signal. DI's are normally used to send instrument such as keyboards or bass guitars down a snake or in to a mic pre-amp. A passive DI is basically just an impedence matching transformer with a pad and a ground lift switch. An active DI uses various electronics to match impedences. They both have their advantages. A passive DI can convert signals in both directions while an active DI can only go from Hi Z to Low Z. An active DI generally has more headroom in the low frequencies and is often used on bass guitar, keyboard, and for DJ's. When a passive DI is pushed very hard, the transformer can begin to saturate causing LF distortion.

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Zach
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Old 11th April 2008, 01:32 AM   #6
slor is offline slor  United States
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Default RE: Bridging Transformer?

Frank, you posted that a bridging transformer (10K - 10K) would work for a DI.... Can you explain? I was under the impression that you wanted to end up with lo-Z in a DI box....

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Seth
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Old 11th April 2008, 12:28 PM   #7
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Quote:
I was under the impression that you wanted to end up with lo-Z in a DI box
Wouldn't that require an isolation transformer + output buffer (hence active DI box)?
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