Building a 5 V Single-Supply Electret Microphone Preamp
The TLV6741 is a 10 MHz op amp with low broadband noise. Its small SC70-5 package and low operating voltage make it well suited to this kind of preamplifier circuit.
The circuit uses the op amp in a transimpedance amplifier configuration, converting the microphone's current output into an output voltage. A resistive divider biases the non-inverting input at mid-supply, holding the common-mode voltage constant. This eliminates input-stage crossover distortion that would otherwise appear at the extremes of the signal swing.
Specs and Features
- Power input: 5 V DC
- Frequency response: 20 Hz to 20 kHz
- Output voltage: 1.2 V
- Key IC: Texas Instruments TLV6741 op amp (SC70-5 package, 10 MHz, low broadband noise)
- Microphone: PUI Audio condenser microphone (MK1)
- Single 3-pin header for power, ground, and audio output
- PCB dimensions: 22.54 mm x 8.26 mm
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The TLV6741 is a 10 MHz op amp with low broadband noise. Its small SC70-5 package and low operating voltage make it well suited to this kind of preamplifier circuit.
The circuit uses the op amp in a transimpedance amplifier configuration, converting the microphone's current output into an output voltage. A resistive divider biases the non-inverting input at mid-supply, holding the common-mode voltage constant. This eliminates input-stage crossover distortion that would otherwise appear at the extremes of the signal swing.
Specs and Features
- Power input: 5 V DC
- Frequency response: 20 Hz to 20 kHz
- Output voltage: 1.2 V
- Key IC: Texas Instruments TLV6741 op amp (SC70-5 package, 10 MHz, low broadband noise)
- Microphone: PUI Audio condenser microphone (MK1)
- Single 3-pin header for power, ground, and audio output
- PCB dimensions: 22.54 mm x 8.26 mm
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