In transformer, input voltage and output voltage are low. Transformer is positive device, its input voltage is same of output voltage. When we use high voltage in primary winding of a transformer, the secondary side of winding of a transformer provides high voltage, so primary winding is affected by high current flow and will be damaged.
In amplifier, we know, low voltage signal converts to a high voltage signal.
According your question, if we use op amp output to a transformer’s primary side as an input voltage, the secondary side will be provided huge voltage signal and amplitude. So primary winding of the transformer will be damaged by high current flow.
I think that you can use transformer’s output to a op amp because transformer provides low voltage. And low voltage signal can be converted to high voltage using op amp. For this, there is no affection in op amp because we know op amp can converts low voltage to high voltage signal.
Thanks for sharing your question.
