3.5mm TRS Audio Jack – Stereo Socket for Audio Electronics Projects
3.5mm TRS Audio Jack – Stereo Socket for Audio Electronics Projects
The 3.5mm TRS audio jack is a stereo socket connector for adding wired audio input/output to Arduino, ESP32, Raspberry Pi, and other DIY electronics projects.
Key Specifications
| Specification | Value |
|---|---|
| Connector Type | 3.5mm (1/8″) TRS stereo jack socket |
| Gender / Style | Female, panel-mount or through-hole soldering |
| Number of Pins | 3 (Tip, Ring, Sleeve) or 5 with switch (variant dependent) |
| Contact Resistance | ≤ 30 mΩ (typical) |
| Insulation Resistance | ≥ 100 MΩ at 500 V DC |
| Rated Voltage / Current | 30 V DC / 0.5 A |
| Mating Plug Diameter | 3.5 mm |
| Mounting Hole | ~6 mm diameter (for panel mount) |
What You Can Build With This
- Arduino Beginner: Build a simple tone generator using tone() and a capacitor filter to play melodies through headphones.
- ESP32 IoT: Create a Wi‑Fi streaming radio player that outputs stereo sound via the onboard DAC to this socket.
- Raspberry Pi Retro: Add a dedicated headphone jack for a RetroPie gaming console using PWM audio output on GPIO 18.
- CBSE/ATL Lab: Assemble a transistor amplifier on a breadboard and use the socket to safely connect an external speaker.
- B.Tech / Smart India Hackathon: Design a portable audio spectrum analyser with FFT algorithm, outputting live monitoring to a headphone jack.
Compatibility
| Platform | Compatible | Connection | Library / Method |
|---|---|---|---|
| Arduino Uno R3 | Yes with condition | Pin 5 or 6 (PWM) to Tip via capacitor | toneAC, direct PWM + RC filter |
| Arduino Nano | Yes with condition | D5 or D6 (PWM) to Tip via capacitor | toneAC, direct PWM + RC filter |
| Arduino Mega 2560 | Yes with condition | Pin 9 or 10 (PWM) to Tip via capacitor | toneAC, direct PWM + RC filter |
| ESP8266 NodeMCU | Yes with condition | I2S (D1, D2, D3) or PWM (D2) | ESP8266Audio, I2S |
| ESP32 Dev Board | Yes | GPIO25 (DAC1) or GPIO26 (DAC2) to Tip/Ring | ESP32 audio library, Audio.h |
| Raspberry Pi Pico | Yes with condition | GP0 to GP28 (PWM) with low pass filter | pico-extras audio_pwm library |
| Raspberry Pi 4 / 5 | Yes | GPIO 18 (PWM0) via filter, or I2S | PiGPIO, WiringPi, ALSA |
Wiring and Interface Notes
For stereo output, connect the tip to the left audio channel and the ring to the right channel, sharing a common ground on the sleeve. Always place a 10–100 µF coupling capacitor in series with the signal line to block DC from microcontroller pins. When panel‑mounting, tighten the nut by hand plus a quarter‑turn with pliers – overtightening may crack the plastic body.
Frequently Asked Questions
Can I connect Arduino output directly to this jack for headphones?
No, Arduino pins output 0 V/5 V square waves. Add an RC low‑pass filter (e.g., 1 kΩ + 10 µF) and a coupling capacitor to produce safe audio levels.
Is this socket suitable for 3D printed enclosures?
Yes, the threaded barrel and nut are designed for panel mounting. Drill a 6 mm hole, solder wires first, then install the nut to avoid stress on the solder joints.
Ask Soldr above what you can build with this — it knows every Compoden kit this part appears in.
Shipping Information
- Prepaid Orders: ₹75 for orders up to ₹999, FREE shipping above ₹999
- COD Orders: ₹125 shipping + ₹50 COD fee = ₹175 total
- Delivery Timeline: Dispatch in 1-2 days, delivery in 2-7 days depending on location
Returns & Warranty
- 7-Day Return: Manufacturing defects only (approval required)
- Warranty: 7 days from delivery
- Non-Returnable: Batteries, consumables, cut wires, clearance items