Also, if I made the follow circuit
τροφοδοτικο +24v, -24v, +12v και -12v
and on the position which is the bridge and capacitors change and put the battery 36v (3*12v in series) / 1.2Ah with fuse on every voltage is good choice? I have not some very special power supply. everything which is simple...but portable power supply with DC input.
second, must I power the preamplifier on serial port back of nim module?