Introducing the WiFi Retromodem, an innovative solution that seamlessly replaces the PCB in your existing external Hayes Smartmodem. With our latest Version 3.2 PCB, experience a nostalgic journey with added simulated audio featuring dial tone, DTMF dialed digits, ringing and the 1200 baud connect cadence. Based on GitHub ZiModem V3.7 sources, its supports baud rates up to 115,200. WiFi Retromodem provides a non-destructive way to allow older serial based computers to connect to a BBS on the internet via telnet.

Includes external 5V 1A power supply.

I've reverse engineered the power board from a Thinkpad 700C. The P/N is 35G4785, and the FRU number is 48G3712. A very similar or identical board is also present in the Thinkpad 700. The schematic isn't perfect. Open a bug report if you find a mistake. Not all components were identified. A number of parts did not have designators on the silkscreen, so I assigned them new ones starting at 300.

The circuit board has four layers and an aluminum core, presumably for heat dissipation.

Do not fabricate this design. The PCB layout is for reference only. There are ground plane cuts in layer User.9 that need to get transferred to the ground plane. There are minor footprint differences as well. There are still unidentified components in the bill of materials.

A desktop application which makes it easy to draw circuit diagrams in ASCII characters. No requirements.txt file, requires the following modules from Pypi:

• xerox
• pypubsub
• bresenham
• PyGObject

Keyboard Layouter is a plugin for KiCad (pcbnew). This plugin places switch footprints in the location specified by JSON of Keyboard Layout Editor.

I have confirmed that it works with pcbnew version (6.0.0) release build on Windows.

Homemade circuits was started with an aim to share and spread the knowledge of electronic concepts freely among the aspiring engineers and newbies, through the expertise of experienced authors involved with this site.

The online world is flooded with multitude of electronic websites offering free electronic circuits and stuffs.. but unfortunately there's one thing they mostly seem to lack, and that's credibility. An electronic idea is not just about publishing a piece of schematic and forgetting, or posting something too technical without an elaborate and convincing explanation.

Here at homemade circuits, unlike others we make sure that the author who is writing the post has an in-depth knowledge regarding the subject, and actively responds to every comment or query posted by a inquisitive visitor. In this site you will find that no electronic concept is unnecessarily made complex just to make it look more advanced. We always try to produce an easier alternative if feasible, so that even a layman can feel inspired to learn more.

Eagle library for USB connectors printed directly on PCB.

A wiki of designs, schematics, and links to open source electronics projects. If you get lost in here long enough you'll find some interesting stuff.

Fritzing is an open-source graphical application for converting a project prototyped with an Arduino into a PCB schematic for manufacture. Designed for people already familiar with Processing to do what they need to do easily. Cross platform: runs on Windows, OSX, and Linux.

A website which lets you design circuitry online in your web browser (i.e., without having to (buy, download and install PCB engineering software). The online circuit designer contains a library of known, documented, and trusted subassemblies of circuits (like power supplies, amplifiers, and volume controls) that you can use as the framework of your circuit, but you have to add the rest. They plan on making it possible to automatically generate and e-mail all of the files a third party small-run manufacturer would need to etch, drill, and mail your circuit boards to you.