Using the Raspberry Pi Pico microcontroller, I was able to design a hearing aid with volume control. The components and a description of why they were used: MCP3008 - CONVERTS ANALOG AUDIO SIGNALS INTO DIGITAL DATA CONVERTED BY THE MICROCONTROLLER MCP4725 - CONVERTS DIGITAL AUDIO SIGNALS TO ANALOG SO THE AUDIO CAN BE OUTPUTTED THROUGH A SPEAKER LM358 - USED TO AMPLIFY WEAK SIGNALS IN THE HEARING AID, REMOVES UNWANTED FREQUENCIES SPU0410LR5HQB - THIS COMPONENT IS A MICROPHONE, SPECIFICALLY CHOSEN BECAUSE IT IS OMNIDIRECTIONAL AND CAN CAPTURE AMBIENT SOUNDS, IT IS A SMALL COMPONENT PERFECTLY USED FOR NOISE REDUCTION, ASSISTING IN CAPTURING CLEAR AUDIO PAM8302AASCR - EFFICIENTLY AMPLIFIES AUDIO, AUDIO SIGNAL FROM DAC (VOUT) IS FED INTO THE INPUT OF THE AUDIO AMPLIFIER, WHICH OUTPUTS IDEAL FREQUENCY AUDIO CEM-1203(42) - SPEAKER WHICH OUTPUTS THE AUDIO AMPLIFIER MODIFIED FEATURE: POTENTIOMETER - WITH THE CCW CONNECTED TO GND, CW CONNECTED TO VDD, WIPER CONNECTED TO PIN 27 OF THE MICROCONTROLLER, THIS FEATURE IS A VOLUME ADJUSTER, WE ARE ABLE TO FULLY TURN OFF AND ON THE VOLUME BY ADJUSTING THE HEARING AID FOR THE IDEAL AUDIO OUTPUT

The PAN JIT SEMICONDUCTOR PJC831K is a 50V N-Channel Enhancement Mode MOSFET designed for switch load and PWM applications, with added ESD protection up to 2KV HBM. Utilizing advanced trench process technology, it offers low RDS(on) values of <1.60Ω at VGS=10V, <2.50Ω at VGS=4.5V, and <4.50Ω at VGS=2.5V. The component is capable of handling a continuous drain current of 360 mA and a pulsed drain current of up to 1200 mA, constrained by a maximum power dissipation of 236 mW at 25°C. The MOSFET is housed in a SOT-323 package with excellent thermal resistance characteristics (530°C/W junction to ambient). It meets RoHS 2.0 compliance and IEC 61249 standards with a green molding compound. Featuring minimal gate charge and fast switching times, this MOSFET is optimized for efficiency and reliability in demanding applications.

Placa PCB Integrada para Control Ambiental y de Motores con Raspberry Pi 5, ESP32 y Sensores