2 _HKI(
"### Pi Attenuator\n" 3 "___a___ is attenuation in dB<br>\n" 4 "___Z<sub>in</sub>___ is desired input impedance in Ω<br>\n" 5 "___Z<sub>out</sub>___ is desired output impedance in Ω<br>\n" 7 "___L = 10<sup>a/20</sup>___<br>\n" 8 "___A = (L+1) / (L−1)___<br><br>\n" 9 "___R2 = (L−1) / 2·√(Z<sub>in</sub> · Z<sub>out</sub> / L)___<br>\n" 10 "___R1 = 1 / (A/Z<sub>in</sub> − 1/R2)___<br>\n" 11 "___R3 = 1 / (A/Z<sub>out</sub> − 1/R2)___\n"