Acoustic Guitar Preamp Power Control and Indicator
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Solution Overview
Problem
Acoustic guitar preamps powered by 9-volt batteries face issues with short battery life, requiring frequent battery replacement during performances and potential loud sound spikes when unplugging the guitar cable, which can damage equipment and disturb audiences.
Innovation Solution
A power control and indicator device is integrated into the acoustic guitar preamp system, featuring a low-voltage push-button switch and LED indicator to manage power and alert the user of battery levels, allowing for safer and more convenient operation by minimizing loud disconnections and extending battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the preamp is powered by a 9-volt battery, then the preamp can function, but the battery life is short and requires frequent replacement
Solution Approach 1:
The patent implements a low-voltage warning system that activates before the battery is completely depleted. The warning indicator alerts the user in advance, allowing them to replace the battery during non-performance periods or take other preparatory actions, thus avoiding interruption during performances.
2Duration of action of stationary object
If the guitar cable is unplugged to conserve battery, then battery life is extended, but a loud sound spike occurs that can damage equipment
Solution Approach 1:
The patent introduces a relay switch as an intermediary device between the user and the preamp power circuit. When the user activates the power control switch, the relay opens the circuit connection, safely disconnecting power to the preamp without creating abrupt electrical changes that would cause loud sound spikes through the audio system.
Solution Approach 2:
The patent implements a controlled power disconnection mechanism that prevents the harmful effect of sudden unplugging. By using the relay switch to gradually and controlledly disconnect power, the system counteracts the potential for loud sound spikes before they can occur, allowing battery conservation without equipment damage.
3Speed
If the preamp remains powered during breaks, then the system is ready for immediate performance, but battery is depleted faster
Solution Approach 1:
The patent implements a dynamic power management system that allows the user to adjust preamp power state based on performance needs. The power control switch enables transitions between powered and unpowered states, while the low-voltage warning system provides feedback to help users make informed decisions about when to power down during breaks versus maintaining readiness.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device ensures longer battery life for acoustic guitar preamps and prevents sudden loud sounds when disconnecting the cable, enhancing performance reliability and audience experience.
Implementation Method 1
a light emitting diode circuit coupled in parallel to the battery
Data Source
AI summary
A power control and indicator device for coupling to an acoustic string instrument preamp is provided. The device includes a light emitting diode having an anode terminal and a cathode terminal, a switch having a first terminal and a second terminal, the switch having a closed position that closes a circuit between the first and second terminal and an open position that opens the circuit between the first and second terminal, a battery connector having a positive terminal and a negative terminal, the battery connector adapted to couple to a battery, a preamp connector having a positive terminal and a negative terminal, whereby with a battery connected to the battery connector, wherein with the switch in the closed position, the light emitting diode is powered and illuminates and the battery connector is coupled to the preamp connector, the battery provides power to the preamp connector, and wherein with the switch in the open position, the light emitting diode is not powered and does not illuminate and the battery connector is not coupled to the preamp connector and the battery does not provide power to the preamp connector.