3-Wire Electret Microphone Pre-Amplifier
This 3-wire microphone pre-amplifier is designed using the low-power, low-noise, and low-distortion OPA1692 audio operational amplifier, making it ideal for high-performance electret microphone applications. The circuit is optimized for electret microphones that use a 3-wire interface, providing excellent audio quality while maintaining minimal power consumption.
The primary application of this pre-amplifier is in wireless microphone systems, where high audio fidelity and long battery life are essential. A typical wireless microphone consists of an electret microphone element, an analog pre-amplifier stage, and a transmission circuit that may use either analog or digital communication methods.
Features
- Power Supply +/-5V DC
- Current Consumption less than 1.5mA (Without LED)
- Maximum Sound Level Pressure SPL 120dB
- On Board Power LED
- Bandwidth 20Hz to 20Khz
- Gain 11.79 V/V or 21.43 dB
- PCB Dimensions: 25.88 x 13.34 mm
Connections
- CN1: Pin 1 = +5V DC, Pin 2 = GND, Pin 3 = -5V
- CN2: Pin 1 = Audio Output, Pin 2 = GND
- D1: Power LED
- MIC: Pin 1 = +5V, Pin Signal, Pin 3 = GND
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This 3-wire microphone pre-amplifier is designed using the low-power, low-noise, and low-distortion OPA1692 audio operational amplifier, making it ideal for high-performance electret microphone applications. The circuit is optimized for electret microphones that use a 3-wire interface, providing excellent audio quality while maintaining minimal power consumption.
The primary application of this pre-amplifier is in wireless microphone systems, where high audio fidelity and long battery life are essential. A typical wireless microphone consists of an electret microphone element, an analog pre-amplifier stage, and a transmission circuit that may use either analog or digital communication methods.
Features
- Power Supply +/-5V DC
- Current Consumption less than 1.5mA (Without LED)
- Maximum Sound Level Pressure SPL 120dB
- On Board Power LED
- Bandwidth 20Hz to 20Khz
- Gain 11.79 V/V or 21.43 dB
- PCB Dimensions: 25.88 x 13.34 mm
Connections
- CN1: Pin 1 = +5V DC, Pin 2 = GND, Pin 3 = -5V
- CN2: Pin 1 = Audio Output, Pin 2 = GND
- D1: Power LED
- MIC: Pin 1 = +5V, Pin Signal, Pin 3 = GND
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