Zobel network calculations

Vintage Asylum

Classic gear from yesteryear; vintage audio standing the test of time.

Follow-up to the thread below, "Fisher 500C Maximum frequency reproduced."
Calculating the inherent inductance of a speaker is not a simple thing. As the link to white paper states.
An example I could find was one used on solid-state 100watt Vox amps:
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"Stability
The existing Vox amplifier designs are sensitive to reactive loading. Modern amplifiers do two things to help with reactive loading. First, they use a series inductor to decouple the speakers and speaker cable at higher frequencies. Usually this is one or two layers of #18 wire wound on the body of a 10 ohm (approx. 6uH), 2W resistor. Second, there is usually a "Zobel" network there.
A Zobel network is usually a 0.1 uF cap in series with a 4.7 to 10 ohm resistor to ground. This helps stabilize the amp loading. Both help with stability - modern amps usually have both. These things are so cheap, it's hard to understand why they're not already in there. I guess that the advantages of these simple networks were just not known to the designers of the amps at the time - but we know, and we can add them easily."

White Paper (Open in New Window)

Edits: 12/12/17 12/12/17 12/12/17 12/12/17

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Topic - Zobel network calculations - FenderLover 07:45:51 12/12/17 (0)

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