Beginner Coin-Cell RGB LED Tutorial Board with CR2032, Slide Switch, and Guided PCB Design Steps

Arduino Uno Shield for Blue Light Optical Sensor. The circuit generates a 2.1kHz sinusoidal signal to send to LEDs and contains a filtering and amplification circuit to preprocess the signal. Powered by 24V and regulated down to 12V and 5V to power Arduino. #ArduinoUno

555 Type, Timer/Oscillator (Single) IC 100kHz 8-PDIP #Timer #commonpartslibrary

Battery Holder (Open) Coin, 20.0mm 1 Cell SMD (SMT) Tab bate or batt #forLedBlink