Shared Projects by dewhisna

This is the STM32F103 replacement for the AN3813K BLDC VCR Cylinder Motor Driver Arduino Shield PID Version V1 board.

PID Loop version of the AN3813K Brushless DC Motor Driver Arduino Shield for use with VCR Cylinder Motors. PID Loop Control done via on-board STM32F103CBT6 coprocessor. The I2C master communicates with the on-board DACs used to drive the AN3813K chip and the slave I2C communicates with the main processor via the Arduino header pins.

All smaller surface mount discrete parts are 0805 footprint except for the higher current resistors which are 1206 parts.

Note: Populate either C1-C3 with R1-R3 or populate C12-C14 without R1-R3. C1-C3 is a low-side filter and C12-C14 is a high-side filter. Only one set is needed. Preference is generally for C12-C14. In either case, those capacitors should be bipolar.

STM32F103C8T6 “Blue Pill” version of the Zeppelin Design Labs Altura MIDI Theremin.

Details on this remix, including source code, schematics, bill-of-materials, and 3D Printed case files, can be found on GitHub.

ERRATA: The MIDI Out DIN port incorrectly inverts the PA9 (USART Tx) output via Q1. This needs to be modified to either add a second inversion to the Q1 buffer logic to invert it back or to remove the Q1 buffer entirely, as the STM32 output can sink enough current. The simplest in-place fix is the latter, which can be implemented by removing Q1 and R3 and replace them with a LL4148 diode with the anode at pin 3 of the Q1 (i.e. its collector pin and connection point to R2) and the cathode at the PA9 end of R3. The reason for the diode is to make the STM32’s output only sink the MIDI pin to ground. This is needed because without it, the +3.3v output of the STM32 may be enough to turn on the MIDI receiver’s optoisolator since the other side of the MIDI connection is powered via +5v.

This is a compact 3-Digit 7-Segment LED Display board, which uses the 5631BH Common Anode LED Display with the Titan Micro TM1637 LED Driver Chip. It is very similar to the many off-the-shelf variations, but is slightly more compact in that it has 3-Digits instead of 4-Digits, as most of-the-shelf versions are, and is thus targeted for applications needing only 3-Digits.

If board overhang isn’t an issue with the mounting technique, the 5631BH can be swapped for a 5641BH 4-Digit Display, as the 4th common anode lead is wired to the TM1637 Driver.

Also, all traces were intentionally left out of the end-plates so that they could be trimmed, if desired, to fit in an even more compact area that doesn’t require the #2 sized mounting holes.

SMD passives are 0805 size.

Schematic, gerbers, and bill-of-materials for this board can be found on GitHub as a sub-part of the Altura-MIDI-Theremin Remix Project, as this board was originally built to use with that project.

EEPROM Add-on Board for the STM32F746G Discovery board via the EXT I2C connector.

Dual-Resonance Solid-State Tesla Coil 340VDC Bus Supply (from 120VAC only).

This version is designed to be used with large electrolytic capacitors, such as Cornell-Dubilier 500C series screw-terminal mount. The prototype circuit is using two 10,000uF 450VDC Cornell-Dubilier 500C series capacitors. Or optionally, you can use the DRSSTC Bus Caps V2 board to mount smaller, through-hole, bus caps to this board using 710-7461097 : Würth Terminals WP-BUFU Pin-Plate 16Pin Bush M6 180A.

This new version allows for either a circuit-breaker or a fuse, and has a completely redesigned digital soft-start circuit to suppress the inrush current at startup, but doing so without the extreme heat of an always in-circuit NTC component. It also switches to heatsinkable through-hole parts for the main diodes at a 30amp rating instead of 15amp.

NOTE: While this design works great as-is, depending on the size of your capacitor bank, consider bumping R18 from 100K up to 150K or so for a longer soft-start charge time.

This design replaces the older DRSSTC Bus Supply V1 version.