Some plots of Q vs frequency for various iron powder cores:

• Q plots of cores 0.01 - 0.2 MHz (pdf)
• Q plots of cores 0.2 - 0.4 MHz (pdf)
• Q plots of cores 0.4 - 1 MHz (pdf)
• Q plots of cores 0.1 - 2 MHz (pdf)
• Q plots of cores 0.2 - 2 MHz (pdf)
• Q plots of cores 0.5 - 5 MHz (pdf)
• Q plots of cores 1 - 10 MHz (pdf)
• Q plots of cores 1 - 20 MHz (pdf)
• Q plots of cores 2 - 20 MHz (pdf)
• Q plots of cores 3 - 50 MHz (pdf)
• Q plots of cores 5 - 100 MHz (pdf)
• Q plots of cores 20 - 400 MHz (pdf)
• download pdf reader from "Links"