Shared Projects

slot take 2, with help from Dan Sheadel

The vias are placed so you can file this 30mm board down to 29mm and not be cutting into the vias at all. 8mm exposed spring pad, mask can be scraped to expand it to a 10mm pad if needed. -Dan

The vias are placed so you can file this 29mm board down to 28mm and not be cutting into the vias at all. 8mm exposed spring pad, mask can be scraped to expand it to a 10mm pad if needed. -Dan

This has a beeper and LED that are switch-selectable to turn on for continuity (conduction) or for discontinuity (open circuit). See Hackaday Project Discontinuity / Continuity Tester

Details are at Hackaday at DB25 IDC26/Header Breakout Board.

This connects up to one each of D-Sub DB25M, DB25F, and IDC26 13x2 0.1" 2.54mm header/ribbon cable. All three connectors are wired together in the standard fashion (DB25-1=IDC26-1, 2=3, 3=5, …, DB25-13=IDC26-25, DB25-14=IDC26-2, 15=4, 16=6, …, 25=24). This can also be used with DB15 and DB9 connectors. The edge of the board sits between the two rows of Dsub pins and is surface soldered. The Dsub DB connectors can be solder cup (preferred) or straight pin (which have to be bent inward toward the PCB for a friction fit before soldering). Solder the D-Sub(s) before soldering in a header.

Version 7 of the wireless mesh sensor nodes board

Rev H

4-bit adder built on the TinyFPGA BX.

shift register driven triggers for modular synthesizers. https://github.com/x37v/shift-triggers

CS5490 Single-phase energy monitor breakout v0.1. This board has not yet been assembled and tested. Use at your own risk. Github

Logic circuitry including delay for active clamp

Logic for controlling inverter.

uC board for controlling boost converter

Active clamp for boost converter

Isolation board for solar inverter

Simplified, pulsed DC output inverter.

Inverter current-fed boost converter V1.01b

Interface between my AnyTone AT-868UV (or any Kenwood speaker-mic standard radio), a PC gaming headset, and my iPhone (most phone headsets are the same):

• The Headphones get both radio and iPhone audio.
• The iPhone In gets both radio and microphone audio.
• External PTT available to mount where convenient (handle of an Arrow antenna?)

Components:

• All SMT components are 1206 SMT.
• The IC is any 4x OpAmp, but choose one that can drive some current since it’s directly driving the headphones; we don’t need high fidelity here, but the more the better.
• All 3.5mm connectors are PJ-320, 4-pin TRRS connectors. I got a bag of 100 super cheap on eBay years ago.
• The 2.5mm connector is PJ-208, 3-pin TRS. Similarly, a bag of 100 super cheap on eBay years ago.
• Board is sized to fit in my favorite cheap 100mm x 60mm x 25mm plastic project box: https://www.ebay.com/itm/272590733575
• Power voltage isn’t critical, anything the op-amp can handle and within spec on your power filtering caps is fine. With the right op-amp, you could probably go as low as 5v, or as high as.. well, a lot. Check your opamp.

Homage paid to my friend, Cliff K7RR SK, after whom Fox-1Cliff is named.

73 de KR6ZY See ya on the birds, SmittyHalibut.

A circuit that turns signals from a bipolar stepper motor to regulated 5V/3.3V DC power. Can also be used to charge a mobile phone using a USB-A female connector.

Source: https://github.com/jonronen/kicad-stuff/tree/master/stepper_generator

Safely link up to eight DCC power-switched turnout frogs to NCE Auxiliary Input Unit to indicate current turnout direction