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I am designing a PSU for a valve amp,? ?and I want to supply the power amp from after the first LC filter stage,? and the preamp from after the next RC filter stage of the power supply.? What is the correct way to add the loads in the simulation schematic?

Hi, you can insert a current tap in various places in the chain. This would allow you to put a tap in for the power amp, and use the final load with a high value resistor (or constant current) to model the draw from the preamp.

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It might look something like this:

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My example above is shown as LC followed by RC, but you could have 2 x LC instead. Do the filters first, then right click on the lower part of the second filter to get the popup menu. From there you can insert the current tap:

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You can then right-click -> Edit on the current tap itself (or double-click) to change the amount of current draw. Hope this helps.

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Regards,

Duncan

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Duncan,

This is a very nice feature that I wasn't aware of.

Thanks for making the Power Supply Designer available and for your attentive replies whenever questions arise.

Cheers,

Tom