Bourns PEL12S Rotary Encoder with Red Illuminated Shaft — 24 Detents, 12mm, No Pushbutton

Bourns PEL12S Rotary Encoder with Red Illuminated Shaft — 24 Detents, 12mm

The Bourns PEL12S-4224S-N1024 is a premium 12mm vertical-mount incremental rotary encoder with a red illuminated knurled shaft — designed for applications where multiple encoders are used simultaneously, such as MIDI controllers, audio mixing equipment, and Eurorack synthesizer modules. The clear knurled shaft is designed to be used without a knob so the red LED illumination is visible, creating a distinctive and functional visual indicator. 24 detents per revolution provides fine control resolution.

Electrical Specifications

• Part Number: Bourns PEL12S-4224S-N1024
• Type: Incremental rotary encoder (no absolute position)
• Detents per Revolution: 24 (24 clicks = 1 full rotation)
• Outputs: A (CLK) and B (DT) quadrature outputs
• Pushbutton: None (no shaft press function)
• Rotation: Continuous 360° (no mechanical stop)
• LED Color: Red
• LED Max Current: 25mA (recommended: 5–10mA with 220–330Ω resistor)
• LED Operating Voltage: 3V–12V (with appropriate current limiting resistor)
• Operating Voltage: 3.3V – 5V
• Base Dimensions: 12.4 × 13.2mm
• Total Height with Shaft: 24mm
• Breadboard Compatible: Yes (bend or trim mounting tabs)

Pin Configuration (5 pins total)

• LED side (2 pins): LED+ and LED− — connect with current limiting resistor (220–330Ω for 5V)
• Encoder side (3 pins):
  • A = Clock (CLK) output → MCU digital input (interrupt-capable recommended)
  • C = Ground
  • B = DT (Direction of Travel) output → MCU digital input

Direction Detection Logic

• Clockwise (CW): When A changes state, B ≠ A
• Counter-Clockwise (CCW): When A changes state, B = A
• Use interrupt-driven reading (pins 2 & 3 on Arduino Uno) for best performance

Typical Applications

• MIDI controllers: Multiple illuminated encoders for parameter control with visual feedback
• Audio mixing: Volume, pan, and EQ control with LED status indication
• Eurorack synthesizers: Modulation depth, frequency, and envelope control
• DJ equipment: BPM, filter, and effect parameter control
• Industrial HMI: Illuminated rotary control with active/inactive visual feedback

Package Contents

• 1 × Bourns PEL12S-4224S-N1024 rotary encoder with red illuminated knurled shaft

Premium Bourns quality — 24 detents, red illuminated shaft, 12mm footprint. The professional-grade encoder for MIDI controllers, audio equipment, and multi-encoder user interfaces.

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