Shared Projects

1A DC/DC buck converter using PAM2305. 5V input to variable 1V to 3.3V output using 2.2uH to 4.7uH 0805 chip inductors. Pinout is standard 7805 TO-220.

Buffer board for an I2C GPIO board

MIDI Encoder for matrix keyboard organs

Small module (12.7 x 12.7 mm plus 3.3 x 12.7 mm for simple monopole antenna) for Espressif’s ESP32 D2WD with 2 MByte embedded SPI NOR flash. Exposes 24 GPIOs to the user as back pads for surface mounting onto acceptor board.

CSULB EE470

This version incorporates a USB header for uploads, as well as FTDI/UART1.

This board uses the default wiring as specified on the MySensors page: https://www.mysensors.org/build/raspberry#improving-throughput-for-nrf24

Small Traffic Light controller

Added missing VUSB on STBC08 battery charger, corrected swapped RX/TX lines at the ESP32.

Plugs into an ST-Link V2 to convert the 100mil 20-pin header into a 100mil and 50mil 10-pin headers with standard SWD pinout. A reset switch and some test loops are also provided.

Because of the height of the header on the ST-Link relative to the housing, I recommend using a piece of ~1/16" or 2mm thick craft foam as a spacer between the bottom of the board and the ST-Link. It can be cut to eh outline of this board, with a rectangle cutout for the header on the bottom, and glued or double-stick-taped to the bottom of the PCB.

 Comment             Pattern     Quantity  Components
------------------------------------------------------------------------------
 100                 RESC1608X85L35N    1    R1                           100O 100mW 1% 100 PPM/°C 0603 Thick Film Resistor
 430 182 095 816     430182080816     1    SW1                            SMT Tact Switch
 5015                5015             5    TP1, TP2, TP3, TP4, TP5      SMT Micro Miniature test point
 966210              966210           2    J1, J2                       2x5-pin 100mil SMT through-board female headers
 Value               20021521-00010T1LF    1    J3                      50mil 10-pin SMT box header
 Value               N2510-6V0C-RB-WD    1    J4                        100mil 10-pin SMT box header

EME103B L/S-Band LNA PCB

Is a PCB for a circuit which can measure the voltage induced by moving magnets.

This version has rounded corners and has moved its LED holes to opposite sides of the board. They are labeled Crosser and Auto-Pilot

4 channel rotary encoder interface

Adapts the 10-pin 50 mil connectors with reversed pinouts on the Atmel ICE to standard 50 mil and 100mil 10-pin headers and provides a standard 100mil 6-pin AVR ISP header, a reset button, and test loops for Gnd, Vtg, and the spare pins on the AVR and SAM headers.

DO NOT USE ATMEL 50-MIL RIBBON CABLES WITH THIS ADAPTER! Use standard straight-through ribbon cables instead.

Two strips of thin double-stick tape above and below the ICE connectors will help keep the board secure.

 Comment             Pattern     Quantity  Components                   Description
------------------------------------------------------------------------------
 100                 RESC0603-GENERIC    1    R1                    100R 100mW 1% 100 PPM/°C 0603 Thick Film Resistor
 430 182 095 816     430182080816     1    SW1                      SMT Tact Switch
 5015                5015             4    TP1, TP2, TP8, TP9       SMT Micro Miniature test point
 AVR.P7              5015             1    TP3                      SMT Micro Miniature test point
 AVR.P8              5015             1    TP4                      SMT Micro Miniature test point
 AVR.P9              5015             1    TP5                      SMT Micro Miniature test point
 SAM.P7              5015             1    TP6                      SMT Micro Miniature test point
 SAM.P8              5015             1    TP7                      SMT Micro Miniature test point
 SMT Female Header   20021321-00010C4LF    2    J1, J7              50 mil 10-positiom Female SMT header
 Value               20021521-00010T1LF    2    J3, J5              50 mil 10-position SMT box header
 Value               N2506-6V0C-RB-WD    1    J6                    100 mil 6-position SMT box header
 Value               N2510-6V0C-RB-WD    2    J2, J4                100 mil 10-position SMT box header

[email protected]

OpAmp Crystal Radio

Tested - Works.