ER-MIDI-THRU

Features

• MIDI In on DIN-5 or 3.5mm TRS Type A
• 4 Channel MIDI outputs on 3.5mm TRS Type A
• Activity LED
• Front Panel is 6 HP wide (30mm)
  • Daughtercard is 28mm wide for easy installation into rack
• 3U tall
• Eurorack 2x8 power jack
  • Uses 5V only

Design

• MIDI In DIN

• MIDI In TRS-A

• MIDI Out TRS-A

Connectors

Daughtercard

Reference Documents

• Deftaudio
  • TRS version
  • DIN version
• All you need to know about TRS MIDI connections

The SOURCE provides the power, whether 3.3v or 5v, to power an LED in the optocoupler in the receiving device, 
while the SINK pulls that power to ground whenever there is data to be transmitted. 

DIN MIDI Connector
In the good old DIN5 MIDI Connectors, 3 out of the 5 pins are used. Pin 2 is used as GROUND, 
Pin 4 is used as the current SOURCE, while Pin 5 is used as the current SINK. 

Type A 
The Type A TRS connection is the official standard adopted by the MIDI Association. The Tip is the Sink (pulls the data line down) and the Ring is the Source.

Assembly Sheet

• ER-MIDI-THRU Rev 1 Interactive BOM
• ER-MIDI-THRU Rev 1 Assembly Sheet