ruckus328
Well-known member
Hoping somebody can help clear this up for me. On an output stage, assuming I'm using either a 5534 or OPA604, and going into a 1:2 step up transformer, and assuming I'll be going into a 600R load (say a pultec, etc), is it ok to drive the transformer directly off of the opamp or will the current demand kill it? If this is ok, then when is it not ok? Does the step up ratio affect impedance seen at the primary (opamp side) of the transformer? I would expect that sure it does, but I'm not really clear there.
I see alot of designs where they're doing just this (like API312, etc), running it directly off a 5534 or DOA, but then consider the LA4 output, why do they have a class AB amplifier there to drive a 1:1 output transformer? LA4 uses TL074 though, so don't know if that might have something to do with it.
I see alot of designs where they're doing just this (like API312, etc), running it directly off a 5534 or DOA, but then consider the LA4 output, why do they have a class AB amplifier there to drive a 1:1 output transformer? LA4 uses TL074 though, so don't know if that might have something to do with it.