Bypassing an op-amp low pass/high pass filter

Discussion in 'General Electronics Chat' started by A.J, Jan 30, 2014.

  1. A.J

    Thread Starter New Member

    Jan 30, 2014
    Hi all, new user here, question:

    I have an old Sony Sub-Woofer unit, uses STK 404, I want to bypass the op-amps in charge of the low pass/high pass filtering, uses 4558, schematics are at sm.pdf
    I just want to bypass IC-602, is there any way to easily bypass this unit without too much modification? Any help would be appreciated.
  2. Brevor

    Active Member

    Apr 9, 2011
    Remove C605, C608 and R611. Run a wire from the empty hole from where you removed C605 that connects to Pin 1 of IC601, run it to the empty hole from where you removed C608 that connects to pin 3 of IC602.