Shared Projects

Original Big Box ATX Adapter for Amiga Computers

Ground Detect 5101 Plug Adapter for 44-52 inserts.

Ground Detect Receptacle Adapter for 5101 44-52 Receptacle

IF upconvering 160GMixer design PCB - files from OSHPark. PCB with/without baluns.

This little board makes it super easy to use the ESP-8266 ESP-01 board in the Arduino environment. The following features are provided:

• CH340G based USB serial interface
• Auto control of RST/IO0 for downloading (uses DTR and RTS like NodeMCU, Wemos mini, etc.)
• Onboard 3.3v regulator
• Bidirectional 5v/3.3v logic level conversion on Rx, Tx, IO0, IO2
• Breadboard-friendly breakout of all essential pins

Parts list:
R1-R9 - 10K 0805 size
R10,R11 - 470 ohm 0805 size
R12,R13 - 10K 0805 size
Y1 - 12mhz SMD-3 ceramic resonator
IC1 - LD117AS33TR SOT223 3.3v 3-terminal regulator
IC2 - CH340G USB to serial interface
D1 - B5819W-TP SOD123 Schottky diode
C1,C4 - 100nf 0805 size
C2,C3 - 10uf 0805 size
Q1-Q4 - 2N7002 SOT23
Q5,Q6 - S8050 SOT23
JP1 - 2x4 0.1" thru-hole female header
JP2,JP3 - 1x4 0.1" thru-hole male header
JP4 - USB-A male thru-hole connector

Eagle files on Github: https://github.com/bratoff/ESP-01-Tamer

This device is designed to function as a differential active probe with a 50 ohm output up to roughly 750 MHz. It uses the AD8003 1.5 GHz triple op amp from Analog Devices.

(GitHub Project)[https://github.com/twmiv/ad8003_diff_probe]

This board makes easy use of FastLED’s powerful parallel output method to drive multiple Neopixel LED(WS2811, WS2812, WS2812B, SK6812, etc) channels. It is designed for the Teensy 4.0 to convert the Teensy’s 3v signals to 5v for the Neopixels. The signals for the Neopixels are terminated at screw terminals for easily connecting strips.

I have tested the board and it works well. Soldering the resistors is a pain as everything gets really tight down there.

Latest version is here.

A PM2.5, PM10, Humidity, Temperature, TVOC and C02 sensor.

Check out the full writeup here.

Get a pre-built version here.

Derived from a Rod Elliott design (https://sound-au.com/project176.htm). A fully balanced, full differential audio amplifier. U1 is an NE5532 but is a universal dual op amp footprint if you want to use something else. Connectors are standard 0.1" headers or wire directly onto the board with the pin holes. C1 and C2 are polarized small caps 1206 size or better, MLCC ceramics of at least 4.7uF. R5 and R6 are 0805 100 to 200 ohms. C3 and C4 are 0805 ceramics 0.1uF. R1-R4 are dual 10K Vishay MPM2002A parts in SOT-23 packages. Use +/- supplies appropriate for the op amp rating chosen and rate the cap voltages accordingly. C5 is a small disc ceramic of 100-220pF for RF suppression. Make this an NP0/C0G type. See Rod Elliott’s description on his web site. With the specified resistors, the CMRR of this amp should be quite high (>80dB) over the audio range. Elliott recommends a 0.1uF cap across pins 4 and 8 (-Vee to +Vcc) to keep this circuit stable but the caps now used which are ground returned should be as effective.

The silk screen on the back of this board says Steve Elliot but the correct reference is Rod Elliott of Elliott Sound Products or ESP. It has been corrected in the source files which I have not uploaded the OSHPark.

WARNING: This board has not yet been tested!!! Order at your own risk. I am awaiting shipment and will update when received.

This board serves as a pin reroute for the Teensy 4.0 to utilize the WS2811Octo Adaptor, both created by PJRC. The new parallel output pins are as follows: 19,18,14,15,17,16,22,23.

Bill of Materials:

1. Teensy 4.0
2. WS2811Octo Adaptor
3. male and female headers

How to use: This is specifically for use with FastLED’s Teensy 4.0 parallel output pins as of 10/21/2019. Please read here for more information regarding programming.

Fixed shorts

Proffieboard to 40-pin adapter.

Teensy 4.0 board to break out all pins via castellated holes to 2 headers of dual-row 14 pin headers.

Solder the Teensy directly to this board then add headers for easy connection.

See the GitHub Repository for details.

Note: It’s best to have these boards made with the 1.6mm thickness. The 0.8mm process has been proven to be unreliable with missing cutouts and torn-off castellated pads.

NOTE: Updated version here

Teensy 4.0 board to break out all pins via castellated holes to 2 headers of dual-row 14 pin headers.

Solder the Teensy directly to this board then add headers for easy connection.

See the GitHub Repository for details.