{"title":"Adafruit 555 PWM Output STEMMA - 1.5K~25 KHz or 1.5~250 Hz","handle":"adafruit-555-pwm-output-stemma-1-5k-25-khz-or-1-5-250-hz-ada5963","url":"/products/adafruit-555-pwm-output-stemma-1-5k-25-khz-or-1-5-250-hz-ada5963","description":"The Adafruit 555 PWM Output STEMMA is a fully assembled 555 timer board that generates an adjustable square-wave PWM signal — no breadboard wiring or external components needed. An onboard trimmer pot lets you tune the frequency across two selectable ranges: approximately 1.5 KHz to 25 KHz, or 1.5 Hz to 250 Hz.\n\nThe output is buffered by a 74HC1G04 inverter, capable of sourcing or sinking up to 12.5 mA — enough to drive piezos, modulate IR signals, generate audio tones, or fake a PC fan tachometer signal. Power the board from 3–12V DC; an onboard regulator caps the 555 and buffer at 5V, so the output stays at logic level regardless of input voltage.\n\nKey Features\n\n\nTwo Frequency Ranges – Selectable ~1.5 KHz–25 KHz or ~1.5 Hz–250 Hz\n\nAdjustable Output – Onboard trimmer pot for precise frequency tuning\n\nBuffered Output – 74HC1G04 inverter can source/sink up to 12.5 mA\n\nWide Input Voltage – 3–12V DC with onboard 5V regulator\n\nSTEMMA JST PH Connector – 3-pin 2 mm pitch for power, ground, and signal\n\nOptional Header – 0.1\" spaced header pads if you prefer soldering\n\nNo Microcontroller Needed – Standalone analogue signal generation\n\n\nIdeal For\n\nPC fan tachometer signal emulation\nDriving piezos and buzzers\nAudio signal generation and testing\nIR signal modulation\nGeneral-purpose square-wave generation\n\n\nPackage Contents\n\n1× Adafruit 555 PWM Output STEMMA (assembled and tested)\n\n\n\nNote: STEMMA JST PH 3-pin cable not included. No soldering required when using the STEMMA connector.\n","vendor":"Adafruit","product_type":"physical","in_stock":true,"options":[],"variants":[{"id":1028,"title":"Default Title","sku":"AF-5963","mpn":"ADA5963","price":7.83,"compare_at_price":0.0,"on_sale":false,"in_stock":true,"available_quantity":100,"option1":"Default Title"}]}