I'm trying to do a SPICE model for the amp I'm building but I have run into a difficulty around the transformers.

I have a Hyeboer 18W HT-6135 output transformer. I know the turns ratios an nominal impedance in ohms but SPICE wants the impedance in Henrys.

I have tried measuring the impedances but although I have a decent oscilloscope I don't have an even half way decent signal generator so I didn't get very far with that.

The primary to secondary turns ratios and impedences in ohms are

Yellow 48:1 3 ohm

Green 27:1 7 ohm

Orange 22:1 15 ohm

When I get this working I'm going to try modeling the power supply and then I'll need to do it again with a much more complex transformer.

Thanks for any pointers.

Hank

I have a Hyeboer 18W HT-6135 output transformer. I know the turns ratios an nominal impedance in ohms but SPICE wants the impedance in Henrys.

I have tried measuring the impedances but although I have a decent oscilloscope I don't have an even half way decent signal generator so I didn't get very far with that.

The primary to secondary turns ratios and impedences in ohms are

Yellow 48:1 3 ohm

Green 27:1 7 ohm

Orange 22:1 15 ohm

When I get this working I'm going to try modeling the power supply and then I'll need to do it again with a much more complex transformer.

Thanks for any pointers.

Hank

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