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Capacitor whining?

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Here's an ATX schematic. The data sheet for the controller is available here.


Note that the TL494 is characterized for operation at 10kHz, with 1kHz being the lower limit.


The signal on the secondary (T3 in the schematic) will bear no resemblance to a sine wave. It's just a series of pulses generated by Q1 and Q2 in response to the load.


There are no bridges in the secondary as the secondary is ground-referenced, i.e. there are no "negative" voltages, so no need for a bridge.


I've never seen a toroidal transformer in an ATX supply. There are toroidal inductors, but every transformer I've seen is an E-frame. Here's a photo of the internals showing the transformer.

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