CPC_RAM512K_V1.01

2 layer board of 2.90 x 2.35 inches (73.7 x 59.7 mm).
Shared on April 25th, 2018 19:13

Amstrad CPC 512K RAM Expansion using a XC9572 5V CPLD for all logic.

Status

• First board received, assembled and CPLD programmed in-situ (via JTAG).
• Memory passing basic tests with an unexpanded CPC464, timing seems fine.
• DK'Tronics software detects board and reports all 512K in memory test on startup

This version fixes the connector pin-out to be compatible with MX4 Motherboards and standard ribbon cable arrangements.

For project and CPLD programming details see my GitHub repository

snc98_main_cpu_v4

2 layer board of 6.62 x 1.18 inches (168.2 x 30.0 mm).
Shared on April 25th, 2018 18:47

snc98_main_cpu with Atmega1284 (40 Pin DIL Socket).

This is a part of .. snc98_Slash-Number-Calculator

snc98_3x4_Switch-block_v4

2 layer board of 2.22 x 3.28 inches (56.4 x 83.2 mm).
Shared on April 25th, 2018 18:44

snc98_3x4_Switch-block – you need 2x this PCB.

This is a part of .. snc98_Slash-Number-Calculator

snc98_Display_15x7-Segment_3-digit_LTD040_v4

2 layer board of 6.10 x 1.32 inches (154.9 x 33.5 mm).
Shared on April 25th, 2018 18:41

155mm wide with 5x 7-Segment 3-digit Display LTD040 (Wenrun).

This is a part of .. snc98_Slash-Number-Calculator

snc98_Display_15x7-Segment_3-digit_LTD056_v4

2 layer board of 7.41 x 1.33 inches (188.2 x 33.8 mm).
Shared on April 25th, 2018 18:38

188mm wide with 5x 7-Segment 3-digit Display LTD056 (Wenrun).

This is a part of .. snc98_Slash-Number-Calculator

snc98_Display_15x7-Segment_1-digit_SC39_v4

2 layer board of 6.10 x 1.32 inches (154.9 x 33.5 mm).
Shared on April 25th, 2018 18:26

155mm wide with 15x 7-Segment Display SC39 (Kingbright).

This is a part of .. snc98_Slash-Number-Calculator

snc98_Display_15x7-Segment_1-digit_SC52_v4

2 layer board of 7.40 x 1.32 inches (188.0 x 33.5 mm).
Shared on April 25th, 2018 18:21

188mm wide with 15x 7-Segment Display SC52 (Kingbright).

This is a part of .. snc98_Slash-Number-Calculator

plusmaze_v2

4 layer board of 3.50 x 2.50 inches (88.9 x 63.5 mm).
Shared on April 25th, 2018 14:22

with lickometer

relay board-2 Rev1

2 layer board of 2.65 x 2.65 inches (67.3 x 67.3 mm).
Shared on April 25th, 2018 12:56

devosaarduino

2 layer board of 3.45 x 1.14 inches (87.6 x 28.9 mm).
Shared on April 25th, 2018 01:52

pneumatic fish board

Neo Geo MVS MV-1Fx Dual Sound Amplifier v2.0

2 layer board of 0.90 x 1.18 inches (22.8 x 29.9 mm).
Shared on April 25th, 2018 01:10

2 Channel sound amplifier for the Neo Geo MVS MV-1Fx series boards. This amplifier will combine the 3 audio channels into 2 audio channels. This board is ideal for low profile installations by using only surface mount components.

Q1-Q2: 2SC1815 SOT23

C1-C6: 4.7uf 25V Tantalum Case B

C7-C8: 10uf 16V Tantalum Case B

R1-R4: 1k Ohm 0805

R5-R6: 10k Ohm 0805

R7-R8: 4.7k Ohm 0805

R9-R10: 120k Ohm 0805

R11-R12: 680 Ohm 0805

R13-R14: 10k Ohm 0805

thermostat.kicad_pcb

2 layer board of 2.61 x 2.11 inches (66.2 x 53.5 mm).
Shared on April 25th, 2018 01:07

Switch Controller Rev1.0

2 layer board of 3.00 x 2.25 inches (76.2 x 57.1 mm).
Shared on April 24th, 2018 23:20

FPC-DIP_4PIN.kicad_pcb

2 layer board of 0.50 x 0.50 inches (12.6 x 12.6 mm).
Shared on April 24th, 2018 22:12

sensirion fpc adapter

FPC-DIP_4PIN-chinaI2C.kicad_pcb

2 layer board of 0.50 x 0.50 inches (12.6 x 12.6 mm).
Shared on April 24th, 2018 22:12

Sensirion flex PCB sensor samples adapter which matches the layout of the common cheap china sensors for the I2C pins.

MS5534 breakout

2 layer board of 0.66 x 0.65 inches (16.8 x 16.5 mm).
Shared on April 24th, 2018 19:15

LTC4425 breakout

2 layer board of 1.61 x 0.83 inches (40.8 x 21.1 mm).
Shared on April 24th, 2018 16:57

88Q5050 connector board (V1)

2 layer board of 1.04 x 0.75 inches (26.4 x 19.1 mm).
Shared on April 24th, 2018 14:07

BOM (Digikey, 1x each) 20021311-00020T4LF (CONN RECEPT 20POS DUAL VERT T/H, 609-3759-ND) 302-S101 (CONN HEADER VERT 10POS GOLD, ED1543-ND) H3DDS-1006G (IDC CBL - HHKR10S/AE10G/HHKR10S, H3DDS-1006G-ND)

Assemble 10 pin connector top with pin 1 inserted as indicated. Assemble 20 pin connector on bottom. Connect to JTAG live with cable.

ButterflyFC

2 layer board of 1.46 x 1.46 inches (37.1 x 37.0 mm).
Shared on April 24th, 2018 03:37

PCB for running brushless-motor quadcopters with the STM32L4 Butterfly dev board from Tlera Corp.

CanDybug

2 layer board of 1.19 x 0.60 inches (30.2 x 15.3 mm).
Shared on April 23rd, 2018 21:56

BOM

(All passive components and LEDs are 0603 footprint, italics indicate optional features.)

• USB-Micro-B connector
• 2 (4) x 100 mil header CAN (and USB power)
• 5 x 50 mil header SWD programming interface
• U1: TPD3S014DBVR (for USB ESD protection and transceiver power control) - alternatively short JP1, or power the transceiver via external 5V
• U2: TPS70933DBVR or equivalent (5Vin 3.3Vout 100mA LDO)
• U3: STM32F042C6T6 or equivalent (USB+CAN)
• U4: TPD2E009DBZR (for CAN ESD protection)
• U5: SN65HVD255DR or equivalent (CAN transceiver SOIC-8)
• D3: 5.6V Zener diode SOD-323 (only if 5V power isn’t from USB)
• X1: XT23 quartz or equivalent (8/12/N MHz crystal)
• C3, C4: 22pF
• C1, C11: 1uF
• D1, D2: frame and error indicating LED (e.g. green and red)
• R5, R6: adjust according to desired LED current
• C5, C6, C7, C8, C9, C10: 100nF
• R7, R8 depend on the CAN transceiver, typically R7 = 0
• R1: 1.5kO (only if STM32F1 or STM32F3 series is used)
• R4: 1MO
• C2: 10nF