![]() The first circuit that we will look at is the negative voltage generator, whose main component is a 555 (IC1). ![]() The circuit has four main sub-circuits: a negative voltage generator, an AC bias circuit, a filter circuit, and a simple mixer. This circuit has multiple sub-circuits that try to improve the quality of recorded data so that, when it is played back, errors are minimized. While audio such as speech and music can be understood, data for computers (depending on the recording protocol) may not be easily read back. How Does the Audio Mixer Work? Cassettes are typically not very good at recording and playing back audio for many reasons, including the quality of the cassette player itself and the inherent properties of tapes.
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