MIDI MERGER / SPLITTER 2 in -> 5 out thru Complete DIY Kit midithru box

Description

This MIDI Merger / Splitter is the special 2 input 5 output thru box which I designed from scratch while not being happy with other options.
Please see my store items and review Youtube video.
youtube.com/watch?v=HIda10k1Uxs
It has two MIDI input ports which are merged together by a microcontroller and then split to five MIDI outputs. Programmed microcontroller is included with a PCB or Kit purchase.
It has optimized schematics for 5V and 3.3V MIDI sender devices, optimized circuitry for optocoupler to minimize false triggering and improve sensitivity. Finally it uses hex inverter with a Schmitt trigger for driving a stronger output signal. This makes it very reliable device.
There are two options for external power
(same cost, leave a note on check out):
To be used with a standard wall adapter 6-12V and 5.5mm*2.1mm connector. In this case a Kit comes with corresponding socket and 7805 power regulator
To be powered from USB port. In this case a Kit includes USB->5.5mm*2.5mm cable, corresponding power socket (so you wont plug wall adapter) and doesn't include 7805. Instead of that you'll solder a jumper.
This is a complete kit with all ICs, passive components, sockets.
Beginner soldering skills required. That means you have to understand schematics, not just being able to solder two wires together. There are no high expectations, but being able to read schematics and understand polarity of components are quite important.
Board size and an enclosure choice:
Size: 5x17cm
Some of you wondered ideas for enclosure selection. Well, some kits produced here can be installed into cast cases, such as MidiThru-4 or MidiMerge_2in->5out into 1032L enclosure. It requires drilling and some patience. Other boards are just too big to go into typical aluminum case. I found it much easier to put them in between two acrylic panels cut to the size and connect them with plastic standoffs. I typically use M3 standoff 20mm and 5mm. 20mm goes on top, and has enough room to cover DIN5 sockets, while 5mm goes on the bottom. There is CorelDraw file on Github with precise board dimension and holes location.
Shipping:
Item will be shipped by Air Mail on the Same or Next Business day of receiving full payment.
This is international shipping from US. Exact delivery time varies from your location and could be up to 3-5 weeks.
NOTE: Don't be surprised, USPS has increased the shipping cost since Jan 01 2016, so the minimal package costs .50 for the first class international.