part replacement

[trigger]

not just east copy west.... but also some US fabless will copy and improve the chips.

One example is california microdevice (hmm... hope I haven't mistaken) .... they have single opamp with low noise and wide bandwidth which is pin to pin compatible with NS one..... but I forget the part number......

And that single opamp is used in an AGC video circuit with very fine performance....... even better the original one......

 

[audioguru2]

MP,
Good point! Reducing the output level effectvely extends the high frequency response to well over 20KHz.
I was going to ask how are we going to keep the output level down during sound peaks (limiter?) until I saw on the mixer's schematic that it has a maximum gain of only one. With low-impedance microphones? Or a phonograph cartridge without RIAA EQ? The output level will be extremely low.