It'a a high pass filter and eventually it will roll off so that the
transistor is not ever biased on. Mine rolled off somewhere below 15
Hz. At 5 Hz the drive was 400 mV, well below Vbe required to bias the
transistor. That's why I changed to a level shifter by dividing the
signal and clamping it to ground. Fewer parts and works to 'DC'.
Dave
transistor is not ever biased on. Mine rolled off somewhere below 15
Hz. At 5 Hz the drive was 400 mV, well below Vbe required to bias the
transistor. That's why I changed to a level shifter by dividing the
signal and clamping it to ground. Fewer parts and works to 'DC'.
Dave