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Old 11th April 2004, 06:55 PM   #1
diyAudio Member
Join Date: Nov 2001
Location: Malaysia
Default Gainclone

Has anyone tried using gainclone chips LM3875/2875 to drive small inductive loads? I'm thinking using one to drive a small 30VA toroid transformer in a power regeneration project.

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Old 12th April 2004, 09:53 AM   #2
adx is offline adx  New Zealand
diyAudio Member
Join Date: Mar 2004
Location: Christchurch
I've done similar things. It should work well, an inductive load is a naturally easy load for an amplifier chip. The chips are overcurrent and overtemperature limited so they are reasonably robust.

A couple of caveats:

I ran into HF oscillation problems - normal GC precautions (Zobels, not running at low gain, short FB path etc) should see it work well.

Watch out for the low DC resistance of the transformer. Even a small offset voltage will cause a reasonable DC current to flow, and toroids saturate very easily. Some way of tweaking out the offset might help (see National appnotes).
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