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RE: Wiring autoformer as HF attenuator

Posted by Randal P (A) on July 31, 2016 at 18:37:17

In Reply to: RE: Wiring autoformer as HF attenuator posted by freddyi on July 31, 2016 at 17:41:42:

This is in 1 dB steps as well (custom order). I figured with 802's going for $500 a pair it was worth the extra cash.

Is there a way to measure/calculate the impedance at each attenuation level? Does the autoformer as as a series resistor?

With the added impedance of the autoformer, I may be able to experiment with a smaller capacitor (i.e., a nicer capacitor since the value will be smaller). If instead of 8 ohm impedance,the total impedance is now 28 ohms, I can go from a 3uF to 0.82uF capacitor.

Am I completely off base?

EDIT: Dave Slagle in another thread stated "another interesting thing with the autoformers is you can do the crossover network at higher impedances making the cap values smaller."

Using an online l-pad calculator, if I need 6dB attenuation, R1 will be 4 ohms and R2 will be 8 ohms. Plugging this into a first order calculator gives me a 2uF capacitor (12 ohms) with an 8 ohm damping resistor.

Edits: 07/31/16

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