Imported from GitHub: jbilander/SDBox-v3 · commit b2b7a8a · license GPL-3.0

Description

A parallel to Pico 2 W and sd-card project for the Amiga

README

SDBox-v3

A parallel to Pico 2 W and sd-card project for the Amiga

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Firmware for this project with support for a blinking activity LED can be built from source here: https://github.com/jbilander/amiga-par-to-spi-adapter/tree/master/rp2350

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BOM Rev. 3C

same as 3B but with these changes:

Reference	Name/Value	Package	Notes
BT1	Push button	Sunrom_Tactile_Switch_3x4x2mm_SMD_2-Pin	Aliexpress
D1-D2 (Optional)	SMD LED	0603	Aliexpress
R1 (Optional)	1k Ω	0805	(Mandatory if D1 populated) Series resistor for D1 LED, adjust R-value to your type of LED and preferred brightness
R2 (Optional)	1k Ω	0805	(Mandatory if D2 populated) Series resistor for D2 LED, adjust R-value to your type of LED and preferred brightness

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BOM Rev. 3B

Reference	Name/Value	Package	Notes
U1	Raspberry Pi Pico 2 W	SC1633 (without header)	RPi Pico 2 W
U2	SN74CBT16210	TSSOP-48 6.1x12.5mm_P0.5mm	20-BIT FET Bus switch with level shifting, high-speed TTL-compatible. SN74CBT16210CDGGR
J1	DB25_Male	DSUB-25_Male_EdgeMount_P2.77mm	DB25 Male Aliexpress
J2	Sunrom Micro SD Card Holder	9-pin Micro SD card slot connector	Sunrom Micro-SD Aliexpress
J3	(Optional) UART0 PinHeader	5-pin 2.54 mm pitch single row	Optional 5V-tolerant header for UART0 (TX on GP12, RX on GP13)
JP1	(Optional) PinHeader/Jumper shunt	2-pin 2.54 mm pitch single row	Jumper on connects Amiga /RESET signal together with RUN-pin (pin 30) on Pico 2 W, resets pico on Ctrl-A-A
D1 (Optional)	LED Square 2x5x7mm	PinHeader_1x02_P2.54mm_Vertical, pin pitch 2.54 mm	Power LED indicator Aliexpress
D2 (Optional)	LED Square 2x5x7mm	PinHeader_1x02_P2.54mm_Vertical, pin pitch 2.54 mm	Activity LED indicator Aliexpress
D3	MMDL6050T1G Small Signal Switching Diode 200mA	SOD-323	MMDL6050T1G
R1 (Optional)	4.7k Ω	0805	(Mandatory if D1 populated) Series resistor for D1 LED, adjust R-value to your type of LED and preferred brightness
R2 (Optional)	220 Ω	0805	(Mandatory if D2 populated) Series resistor for D2 LED, adjust R-value to your type of LED and preferred brightness
R3 (Optional)	10k Ω	0603	Pull-up for /STROBE signal, not currently used
R4	2.9k - 3k Ω	0603	Resistor for dummy loading D3 to achieve steady 0.6-0.7V VCC drop resulting in ~4.3V power supply to U2 CR0603-FX-2941ELF
RN1, RN2	CAY16-103J4LF RES ARRAY 4 Resistors 10k Ω	1206	CAY16-103J4LF
RN3	A103J	Bussed Resistor Network Array SIP-9	Pull-up resistors for data lines, 9PIN-10K Aliexpress
C1	Capacitor 10uF	1206
C2	Capacitor 0.1uF = 100nF	0805
C3	Capacitor 0.1uF = 100nF	0603
Housing	2 x Plastic Shell Cover	For DB25 plug	Aliexpress
2 x PinHeader	PinHeader Board Weight/Level Support	3-pin 2.54 mm pitch single row	Move the plastic guard to leave ~7.5 mm of pin before soldering in order to hold board in perfect level

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When ordering from JLCPCB select:

Specify Layer Sequence: Yes

L1(Top layer):    F_Cu.gbr
L2(Inner layer1): GND_Cu.gbr
L3(Inner layer2): VCC_Cu.gbr
L4(Bottom layer): B_Cu.gbr

Remove Order Number:

Specify a location

This will notify JLC where to put the order number, they will replace the "JLCJLCJLCJLC" silkscreen label.

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