Wow! Eleven years since I last revisited this topic!
Anirvan,
The inputs are AC coupled together, but not DC coupled. This protects the IC from damage. in the eleven years since last posting - neither or nor the current owner of the amplifier has had any issues with this arrangement.
If you are speaking of the RCA and 1/4 inch jack, Those are isolated from the IC by the FET. Again, no problems known. :dbtu:
Regarding the 220 uF vs 470 uf in the feedback circuit - the Xc of 470uF is about 4.2 ohms at 80 Hz, and Xc of 220 uF is about 9 ohms at 80 Hz.
Looking at the feedback resistive setup - i think that going with a 220 uF would reduce the bass amplification response of the amplifier - by how much? I have not a clue. :cheesy:
Anirvan,
The inputs are AC coupled together, but not DC coupled. This protects the IC from damage. in the eleven years since last posting - neither or nor the current owner of the amplifier has had any issues with this arrangement.
If you are speaking of the RCA and 1/4 inch jack, Those are isolated from the IC by the FET. Again, no problems known. :dbtu:
Regarding the 220 uF vs 470 uf in the feedback circuit - the Xc of 470uF is about 4.2 ohms at 80 Hz, and Xc of 220 uF is about 9 ohms at 80 Hz.
Looking at the feedback resistive setup - i think that going with a 220 uF would reduce the bass amplification response of the amplifier - by how much? I have not a clue. :cheesy: