Flexible MIDI sync box with DIN sync support and independent configurable outputDesigned by Deftaudio in United States of America
This is MIDI synchronization device with native support for Din Sync (or also called Sync24) output as well as configurable sync output on 6.3mm jack. The later one can be used for synchronization of…Read More…
This is MIDI synchronization device with native support for Din Sync (or also called Sync24) output as well as configurable sync output on 6.3mm jack. The later one can be used for synchronization of other devices such as drum machines, arpeggiators in synths, sequencers and others. There is a dip switch which can set a pulse rate all the way up to 48ppqn.
Microcontroller is responsible for driving all sync signals and it's included with a PCB or Kit purchase.
There are two options for switches - micro slide type of the switch or a jumper. Jumpers are for more hardwired environment there you need the robust option that you can't move by a mistake. While slide switch option is for flexibility to choose MIDI input port. For more info refer to the picture.
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. This is an active circuit, so it does require an external power. That’s the way it should be according to the MIDI specs.
There are two options for external power:
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 between Pin 1 and Pin 3. Leave Pin 2 not connected. Please make sure, you use USB port or adapter with 5V output and verify it prior to connecting to the board. There are some QuickCharge USB chargers which can bump a voltage. Please, avoid using them.
I actually designed a whole family from the most basic to the complex MIDI devices with merging capabilities, please see my store items and review Youtube video.
Board size and an enclosure choice: Size: 4x12cm
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.
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Benjamin | April 30, 2022
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