"...in theory there is no difference between theory and practice, while in practice there is...." ζs=R/L Zo=√(L/C) Δ Ω σ μ Ï„ ω β δ η ϕθ λ Ï€ ζ ∞ ° √ Δ ∂ ∫ Æ© ± ≈ ≠ µ Ω ± ÷ Θ « » ≦ ≧ Σ Φ ε • θ λ ρ ω κ ² ³ ½ ¼ ¾ ° ∞ ∫≈ ≠ ≡ Ξ ∑ Ï€ Π © ® õáûz{ }~€{‚ƒ „…†‡ˆ‰Š‹‚ŒŽŸ‘’“”•–—˜}˜™š›œ0×0Ÿ0Ë ¡¢0ú¤¥¦§¨©ª«¬­®¯°±²³ª´Á¶·¸¹º»¼½0☺ 50♥0¹³²■ ☺☻♥­±‗¾¶§÷ < Low ESR Caps , High SRF L with a BPF example (options> Show Phase to be enabled) You can use Ideal Op Amps or change gain but add ESR ( check View gain/phase & Log View boxes) draw arbitrary waves or preset ones. :) gmail: tony.sunnysky Richmond Hill, ON, Canada Time Zone : Retired Standard Time ©