MRBus-enabled two channel DC model railroad throttle. Source and BoM can be found at Iowa Scaled Engineering’s Github account

4th Order filter

Standard 35RAPC4BH3 stereo jacks and 1mil header or KF2510 header Breakout Board Schematics http://aaes.us/bitx/stereo12-package.zip

5-knob version of Valve Wizard’s Engineer’s Thumb for a 125B enclosure with top mounted jacks. Layout by storyboardist/Effects Layouts

smartbell #smartlock #433mhz #ws2812b

Breakout board for the common and widely available STM32F103C8T6 “sticks”. Provides easy connection for both I2C channels at both +5V and +3.3V with level converters. Has dual serial FTDI ports with level shifters, MicroSD Card slot on SPI #2, Waveshare compatible SN65HVD230 CAN connector port, and breakout connectors for Analog, PWM, and SPI #1.

Assembly Note: Be sure to trim the bottoms of the ST-Link connector pins on the STM32F103C8T6 board before soldering it to this breakout board. If you don’t, those pins will likely collide with C1 and perhaps R20 and R24. Trimming them, however, gives plenty of clearance.

DO NOT BUILD This circuit has serious design issues rendering it virtually useless. The biggest problem is that the sensor input circuit’s filter time-constant is greater than the PLL frequency, causing it to never detect lock. It comes closer to working without C2 and C7 installed, but even then has such a small window of detection that it’s useless.

A better variation would be to remove C2 and C7, ditch the entire HC7046 PLL and 74LVC1G123 debounce circuit, tie the input side of R8 and R15 to +5V, and just use the 74HCT14 output signals directly. But that basically means throw this board away and just use the sensors with a couple of schmitt trigger inputs for filtering.

For a usable version of this circuit, see the original Modulated Reflectivity Sensor Driver instead.

Attempt to reproduce functionality of HP’s bubble display using Lumex’s 0201 white leds.

The TinyFPGA Programmer is designed to program TinyFPGA A-Series boards. It is meant to be a fast, tiny, low-cost, and open-hardware programmer.

Please take a look at the project’s hackaday.io page and also take a look at he TinyFPGA A-Series project page. Source code and design files are available on the TinyFPGA GitHub. Assembled boards will be available on the TinyFPGA Tindie Store.

ATTINY Arduino programmer shield

35RAPC4BH3-Shield http://aaes.us/bitx/stereo.zip

This board can be used to easily create the necessary circuit for outputting composite video on your TurboExpress or PC-Engine GT.

This board is designed to allow only a screen mod or AV out, not both.

Please note that you do need to lift and ground pins 19, 25, 29, 32, and 39 on the HuC6260 to enable composite video. Big thanks to thesteve of PCEngineFX forums for the circuit schematic.

To keep the board small, consider ordering it as .8mm thickness. Also note this board is designed to use 2n3904 equivalent SMD transistors. If you want to use A/V out, a different board is necessary.

https://oshpark.com/shared_projects/SAfzq1dI/

This board can be used to easily create the necessary circuit for outputting composite video on your TurboExpress or PC-Engine GT.

This board is designed to allow both a screen mod and an A/V out jack.

Please note that you do need to lift and ground pins 19, 25, 29, 32, and 39 on the HuC6260 to enable composite video. Big thanks to thesteve of PCEngineFX forums for the circuit schematic.

To keep the board small, consider ordering it as .8mm thickness. Also note this board is designed to use 2n3904 equivalent smd transistors. If you do not want to use A/V out, a different board is necessary.

https://oshpark.com/shared_projects/fAyYocPK/

Arduino Shield Biodata Sonification System

Corrected SPI Flash footprint error.

KiCad PCB version of the ESP8266 Milight gateway.

http://blog.christophermullins.com/2017/02/11/milight-wifi-gateway-emulator-on-an-esp8266/

Eagle version of the ESP8266 Milight gateway. This design has a mistake, but works. (GPIO2/GPIO16 swapped!)

http://blog.christophermullins.com/2017/02/11/milight-wifi-gateway-emulator-on-an-esp8266/