Tobiah wrote:
Oh, you want the link I suppose!
http://sound.whsites.net/project66.htm
They want $22 for the circuit board. Not sure what the components
cost.
** The PCB allows two low noise per-amps to be built.
By the time you have purchased all the small components, a pair of 10kohm reverse log pots and XLR sockets the total cost will be over $40.
The NE5532 can be swapped for a TL072 with some saving and less current draw, but stick with the recommended 2N4403 input transistors or you will not get anywhere near the specified low noise.
The idea is that it would be incorporated inside equipment that lacked such pre-amps.
..... Phil