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how can i keep an input sine wave negative/positive with a unipolar supply?
basically im trying to build an amp but im not sure if its possible to keep a sine wave with a negative peak when im powering transistors with +35v and 0v. ive made a few different preamp simulations using crocodile clips, such as the mesa boogie dual rectifier pre amp (but simulated transistors instead of tubes) and a distortion pedal i found online. none of these use negative suplies but the waves they produced still had negative peaks. ive tried playing around with single transistors on the same program but i cant find a way to keep the negative part of the input signal.
What you do is bias the waveform, making it fully positive DC of varying level.
AC coupling, as Bill has indicated, will remove the DC bias voltage later, leaving the + and - sine wave once again.
You must use the particular transistor's spec. sheet to find the linear amplification part of its curve and keep within it, or distortion will occur in the output waveform.
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