Shared Projects

Mechanical model of HVPS board - NOT FOR FLIGHT

Xecuter 3.1

This is a small circuit to generate fake disk-seeking noises for Apple II disk emulators using a mechanical relay. It connects transparently between the Apple II and any disk emulator to detect disk activity and make noises.

The project main page is hosted on github: https://github.com/markadev/AppleII-Disk-Clacker

Connect a Mitutoyo caliper/micrometer to an Arduino

See this project for a universal, surface mount version.

Note: I recommend ordering this PCB with the 2oz copper, 0.8mm option.

This circuit provides a means to cycle the power on a Galaxy’s Edge droid (especially BB-units) to wake them up after they go to sleep (from 5 minutes of inactivity) by briefly tilting the droid upside down.

This PCB is designed specifically for BB units to fit over a nub on the outside of the plastic housing of the BB’s motor, specifically the motor to the right of the logic PCB. This pcb would be placed with the component silk screen facing in towards the logic PCB and the droid silkscreen side facing away.

This design uses only through-hole components to make soldering a little easier.

The power transistor should be a logic-level N-channel MOSFET in a TO-220 package. Something like an IRLZ44N will work, but there are many options out there.

When soldered to the board, the MOSFET should stick out horizontally, do not bend it to face as it will not fit when the BB unit is closed.

The tilt switch should be bent away from the PCB, but parallel with the PCB, such that when the BB is upright it is making a connection.

The connectors used are JST-PH 2.0mm pitch connectors. I suggest a female socket for the BATT connector and a cable with a male connector for the DROID connector. This will allow you to plug the battery connector into the PCB and then connect the PCB to the battery connector on the logic PCB.

Note: links in BOM below are not affiliate links, just examples of where you could possibly locate the components needed to assemble this PCB if you do not already have them.

BOM:

• 2 x 100k 1/4W through-hole resistor
• 1 x 10k 1/4W through-hole resistor
• 1 x 100 ohm 1/4W through-hole resistor (this has all necessary resistors)
• 2 x 2n7000 N-Channel MOSFET in TO-92 package
• 1 x 10uF ceramic capacitor (this set includes 10uF capacitors)
• 1 x JST-PH 2.0mm female socket
• 1 x JST-PH 2.0mm male lead (this has both connectors)
• 1 x SW-520D tilt switch
• 1 x IRLZ44N N-Channel MOSFET in TO-220 package

A simple breakout board for an RJ11 Jack.
Uses Molex part no. 43860-0003.
Design files at https://github.com/JChristensen/rj11_bob

The project is an electronic board for operating an LED array. This is a complete PCB project for managing an LED array, including a professional printed circuit board design with all the files required for manufacturing, assembly, and documentation. The circuit allows for arranging and operating multiple LEDs, and is suitable for use in display systems, smart lighting, educational projects, and DIY.

two amplifiers to drive 7 leds' anodes (from an mmcx signal) and cathodes (from a pot) in a 16mm cage format

PMOD for 16 Mbit of SPI Flash and 64 Mbit of Pseudo SRAM using Adafruit’s GD25Q16C and ESP-PSRAM64 chips, which are only like $1 each.