Shared Projects

4 Relay Board for activating solenoid locks in CRU3

FT-817 GPSDO Input Board Ver 1.00

Yaesu FT-857 GPSDO Input Board Ver1.00

A panel for a 11 hp passive eurorack attenuator in 1U (IJ format).

The panel can be used without a component pcb (just add the jacks and solder on the back with some wires).

I will upload a component pcb shortly.

This version has no hole for LEDs, it is a plain passive multiple.

Capacitor Adapter 1206

Capacitor Adapter 1210

Capacitor Adapter 1812

Capacitor adapter 2225

This is the PCB for a flashlight that runs continuously for one year, when powered by three rechargeable 2400mAh NiMH batteries.

Note that the batteries must be of the low-self-discharge type, or the batteries will go flat faster.

The PCB is designed to fit into a 4xAA battery holder, in place of one of the batteries.

The description of this circuit is published in Renew magazine, issue 166, available from January 2024. https://renew.org.au/renew-magazine/

Note that there is a typo in the above magazine article: in some places in the text, the capacitor has been described as “10mF”. This should have said “10uF”, as it did in the pre-prints of the article that I received.

Tools needed for assembly:

• Soldering iron and solder.

• Wire cutter.

• Fine-point pliers, often called “needle nose” pliers.

• A coat hanger made from wire, and two wooden spring-type pegs.

• a file or some fine-grit sandpaper.

Parts list:

• the PCB, ordered from Osh Park.

• a paperclip made of wire, approximately 25mm (1-inch) long.

• one battery holder that takes four AA batteries. Jaycar PH9200 is suitable.

• one 100-ohm resistor, 1/4W rating.

• one 3.3k resistor, 1/4W rating.

• two 10k resistors, 1/4W rating.

• five 220k resistors, 1/4W rating.

• one BC546 transistor (BC547, BC548 and BC549 are suitable alternatives).

• three BC557 transistors (BC556, BC558 and BC559 are suitable alternatives).

• one 10uF electrolytic capacitor with 6.3mm diameter or smaller, and 6V or higher rating.

• one superbright 5mm LED. Jaycar’s ZD0196 is suitable, and it appears to be a Cree C512A-WNN.

There is a PDF of the assembly instructions, with pictures, on GitHub.

To download the instructions, go to https://github.com/Renew-Magazine-1-year-flashlight/Assembly-Instructions

Click on the green “<> Code” button, and then click on “Download ZIP”.

Verified!

LEDs for a small ceramic Christmas tree.
BOM and more at https://github.com/JChristensen/XmasTreeLEDs

Move five silver dollars, represented by LEDs, along a strip of 12 positions.

For more information see http://www.technoblogy.com/show?4KA5.

Released under the CC BY-NC-SA 4.0 License

Order as Flex PCB

Please keep in mind that these are prototypes, i can’t guarantee that they will be as reliable as CR1616 cells with welded tabs, order and use at your own risk, if you want to make sure the battery stays in place you can place a 10-12mm round sticker on top of the retainer & battery (a thin fabric sticker meant for furniture can be used if the retainer isn’t sitting flat)

Put a radio on a nucleo-144 board.