#define SS_PIN 10 #define RST_PIN 9 #define SERVO_PIN 3 #define GREEN_LED 6 #define RED_LED 7 MFRC522 rfid(SS_PIN, RST_PIN); Servo myServo; byte authorizedUID[4] = {0x91, 0x61, 0x31, 0x03}; // !!!

This Pre-Amplifier circuit is a minimalistic design, a.o. inspired by valve design, which should help sound clarity. The circuit counts 5 transistors, has 0.1% distortion (expected from 60dB loop gain ...

You can create a release to package software, along with release notes and links to binary files, for other people to use. Learn more about releases in our docs.