Our Technical Support team will be out of the office on Wednesday, April 23 starting at 12pm. Tech Support will reopen with normal hours on Thursday, April 24 at 9am. Thank you



Member Since: August 14, 2011

Country: United States

  • Product BOB-09964 | about 2 years ago

    Looking at the schematic, I see R1 and C1 forming a high pass filter, followed by C3 and R5 forming a low pass filter. The general equation for RC filter corner frequencies is

    3db corner freq in hz = 1/(2 * Pi * R in ohms * C in farads)

    I calculate (better check my math!)

    high pass = 1/(6.28 * 2.210^+3 * 4.710^-6) = 15.4 Hz

    That sounds reasonable unless you want infrasound.

    low pass = 1/(6.28 * 1010^+3 * 1210^-12) = 1,300,000 Hz

    That sounds a little high to me for audio!

    If they used C3=12 nanofarads instead of picofarads the low pass would have been 1,300 Hz, which is in the audio ballpark.

    I wonder if there is a typo in the schematic, or if the circuit is incorrect? Again, better check my analysis!

No public wish lists :(