Just bought this DIY kit for a preamp ( together with a very cool case )
This is in Japan, and all instructions are in japanese which I cannot read. Maybe somebody here can help me out.
l1st attached image shows the schematics, 2nd the wiring.
I am using stereo mini for in and out. So I connected the 'grounds' and run the 'S' ( uuh, they are difficult to see, will post better fotos later. The 'S' are the conncections on the in and out which are not ground ) on the input schematics to the middle and front contact of the stereo mini.
Same I did for the 'out', grounds connected together to the ground of the stereo mini, and the connection named 'S' for left and right channels to the middle and tips of a stereo mini.
On trial I ran into a problem: only one channel is showing.
what's my mistake?
please also have a look at the 3nd and 4rd schematics:
the 3rd shows how to conect a potentiometer as gain selector. Here I am lost. The square shown to the left is the preamp, the middle the battery, but what is the big square on the right side with many words inside?
the 4th image shows two samples of two different mics connected, the first with two cables, the other with 3 cables which shows a resistor has to be added. For which kind of mic is that added resistor necessary? ( right now I am connecting an AT822, later an SP-CMC4 )
Generally: what do you think about this circuit? Worth while?
The opamp used says: GO15A ( or CO15A ) but I also bought another which says: G001B ( or C001B )
should I replace it?