I am working on Nelson Pass First Watt Amps PCB, let me know if you guys would be interested too !
Line level inputs (Disc, CD, Video, Aux, Tuner, Tape1, Tape2)
Input impedance (R and C) 20k? + 470pF
Input sensitivity (ref. rated power) 240mV
Maximum input signal 6V
Errr. What exactly do you mean? Are you working on building the PCB?
Which version? The F5 is supposed to be the best of the lot so far, and is easily tweaked for a variety of power outputs, plus the support thread on DIYA is huge..
I have pre-amp with variable gain ! but thats designed for 5.1channel.
If I find similar, same can be modified for your kind of use..
will start working on such pre-amps.. !
First Watt F1 PCB Image ...
PCB's are Ready, costing around Rs.170 Each Board.
If I there is more requirement, based on nos costing will go less.
PCB Type : FR-4, 70micron copper, PTH , Solder mask, and Silk screen..
Also I am working on F3, F5 and LM3886 based, op-amp based Projects.. will post as I complete.. (there will be relevant thread.. )
also can help you guys with custom projects..