Communication is modelled down to Windows driver level, with all requests to and replies from the simulated USB device displayed in the USB Transaction Analyser. See license.txt for additional information.You can now design your own USB peripheral device entirely in Proteus (using one of the supported microcontrollers) and then test both the firmware and the hardware by simulating the circuit. The format is EagleCAD schematic and board layoutįor more details, check out the product page at LicenseĪdafruit invests time and resources providing this open source design, please support Adafruit and open-source hardware by purchasing products from Adafruit!Īll text above must be included in any redistributionĭesigned by Limor Fried/Ladyada for Adafruit Industries.Ĭreative Commons Attribution/Share-Alike, all text above must be included in any redistribution. PCB files for Adafruit MAX4466 Electret Mic Amplifier. The output is rail-to-rail so if the sounds gets loud, the output can go up to 5Vpp!
That's down to be about 200mVpp (for normal speaking volume about 6" away) which is good for attaching to something that expects 'line level' input without clipping, or up to about 1Vpp, ideal for reading from a microcontroller ADC. On the back, we include a small trimmer pot to adjust the gain. This breakout is best used for projects such as voice changers, audio recording/sampling, and audio-reactive projects that use FFT.
For the amplification, we use the Maxim MAX4466, an op-amp specifically designed for this delicate task! The amplifier has excellent power supply noise rejection, so this amplifier sounds really good and isn't nearly as noisy or scratchy as other mic amp breakouts we've tried! This fully assembled and tested board comes with a 20-20KHz electret microphone soldered on. Adafruit MAX4466 Electret Mic Amplifier PCBsĬlick here to purchase one from the Adafruit shopĪdd an ear to your project with this well-designed electret microphone amplifier.
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