Stereo Mixer with Headphones Out

Custom Stereo Mixer with Headphones out.
This custom mixer is designed for Stereo Signals and be used as a summing box that can take 2 stereo signals (Input + AUX) and combine them into a single stereo output, also providing you the ability to simultaneously use a separate output for headphones connection. In the AUX-in you can connect even your phone or an mp3 player or similar device with a TRS output.
It features high-impedance inputs (buffered with JFET op amps) that can be driven either by instruments (guitar, bass etc) or line level signals as well. It makes use of low distortion, low noise op amps and each input has a volume knob that goes from mute, up to unity gain. The output impedance is very low, ensuring the best interconnectivity with the rest of your gear.
Input & output have separate TS jacks for L & R channels while the AUX-in is a single TRS jack.
The 3 potentiometers control the stereo volume for each signal: 1. AUX, 2. IN, 3. Headphones
Technical Specifications
  • Input impedance: 10MΩ
  • Aux Input impedance: 10MΩ
  • Output impedance: 100Ω
  • Typical headphones-out power: 300mW for 32Ω headphones @9V
  • Max headphones-out power: 0.5W
  • Flat Frequency response on the whole span of the audio spectrum.
  • Required power supply: 9-12 Volt DC
  • Polarity: negative tip
  • Current draw: 30mA @ 9V
  • Enclosure dimensions: 120 x 95 x 37mm
  • Weight: 320gr