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General| Manufacturer | Radio Shack |
|---|---|
| Model | VoxBox TRS-80 |
| Category | Control Unit |
| Compatibility | TRS-80 computers |
| Connection | Expansion port |
| Interface | Expansion port |
Lists and explains BASIC programs to verify operation and debug the VOXBOX unit.
Step-by-step instructions for safely disassembling the VOXBOX unit for internal access.
Details the power supply voltages, test points, tolerance, and ripple specifications.
Explains the microphone preamp's function, gain, and frequency compensation for signal processing.
Describes the low and high bandpass filters and their output characteristics.
Describes the zero-crossing detector operation and its output signal characteristics.
Explains the rectifier/averager stages, their input/output signals, and role in speech energy detection.
Explains address decoding, port access, and data bus format for TRS-80 communication.
Instructions for reassembling the VOXBOX unit after servicing or inspection.
Details the dynamic microphone and its push-to-talk switch, specifying signal output.
Explains the preamp's pre-emphasis, gain stages, and output bias for signal processing.
Describes the low and high bandpass filters, their passbands, and output characteristics.
Details the internal power supplies (+5V, +12V) and voltage regulation circuits.
Explains the data bus format for speech recognition results, as shown in Figure 4.
Provides general information including function, type, vocabulary size, and connectivity.
Specifies power requirements and voice input details for the VOXBOX device.
Lists dimensions, temperature range, humidity, and weight.
Detailed list of capacitors used in the VOXBOX, including reference designator, description, and part numbers.
Detailed list of resistors used in the VOXBOX, including reference designator, description, and part numbers.
Lists integrated circuits, semiconductors, and miscellaneous components.
Circuit diagrams and logic for 74LS30, 74LS02, and 74126 integrated circuits.
Schematic and connection diagrams for LM339 comparator and LM324 amplifier.
Schematic and connection diagrams for 78L12 and 78M05 voltage regulators.
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