Microphone Device With Constant Current LED Display Circuit
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Solution Overview
Problem
Conventional microphone devices with light emitting elements experience noise interference during lighting and non-lighting operations due to fluctuations in power supply voltage, affecting audio signal quality and visibility of the LEDs.
Innovation Solution
A microphone device configuration that includes a condenser microphone unit, an audio output circuit, a power supply circuit, and a display circuit with constant current elements and a constant voltage element, where the light emitting elements are connected in series with a transistor driven by a manual switch, and the constant voltage element provides a stabilized voltage through a balanced transmission line, preventing noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If light emitting elements are connected directly to the power supply circuit, then the lighting operation can be controlled, but noise interference occurs due to power supply voltage fluctuations
Solution Approach 1:
A constant current element is introduced as an intermediary between the power supply circuit and the light emitting elements. This constant current element stabilizes the current flowing through the LEDs, preventing power supply voltage fluctuations from causing noise in the audio signal circuit while still allowing lighting control through the manual switch.
Solution Approach 2:
The power supply system is segmented into separate functional blocks: a power supply circuit for the audio output circuit, and a display circuit with its own constant current element for the light emitting elements. This segmentation isolates the noise-generating lighting operations from the audio signal path, eliminating mutual interference.
2Illumination intensity
If multiple light emitting elements are connected in parallel, then visibility is improved, but power consumption increases and control complexity increases
Solution Approach 1:
A constant current element serves as a mediator that enables multiple light emitting elements to be connected in series while maintaining stable current flow. This series connection with constant current control achieves the visibility of multiple LEDs without the excessive power consumption and control complexity of parallel connections.
3Use of energy by moving object
If light emitting elements are connected in series, then power consumption is reduced, but voltage requirements increase
Solution Approach 1:
A constant current element is introduced as an intermediary that decouples the light emitting elements from direct power supply voltage fluctuations. This allows series connection of multiple LEDs (reducing power consumption) while the constant current element handles the voltage requirements, preventing noise interference that would otherwise occur with high voltage swings.
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
This configuration ensures stable operation voltage and current for the LEDs, preventing noise interference with the audio signal output circuit and allowing for improved visibility of multiple LEDs connected in series.
Implementation Method 1
display circuit including light emitting elements that perform lighting and non-lighting according to an operation of the manual switch, wherein the display circuit includes constant current elements that generate a constant current through the balanced transmission line
Implementation Method 2
a constant voltage element that is connected to the constant current elements and generates a constant voltage
Implementation Method 3
LED which consumes little power and has good visibility is used as the light emitting element
Data Source
AI summary
A microphone device includes an audio signal output circuit that balanced-outputs, through a balanced transmission line, an audio signal output from a condenser microphone unit, a balanced output terminal including a hot terminal, a cold terminal, and a ground terminal connected to the balanced transmission line, a power supply circuit that supplies a phantom power supply to the audio output circuit from the balanced output terminal through the balanced transmission line, and a display circuit including light emitting elements that perform lighting and non-lighting according to an operation of a manual switch, and the display circuit includes constant current elements that generate a constant current through the balanced transmission line, a constant voltage element connected to the constant current elements and which generates a constant voltage, and light emitting elements connected to the constant current elements, and to which the constant voltage by the constant voltage element is applied.