RA16PA Tech Notes TN0256 Running a Medusa PreAmp off an external battery TN0245 Preamplifier clipping indicators light when signal input voltage is below the input range TN0217 Using RZ processors, BioAmp input appears clipped or larger than expected TN0103 3 kHz noise masks neural activity TN0067 Some RA16PA and RA4PA generate a 3 kHz noise that masks neural activity