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C64 Saver addon board

bwack·C64-Saver-bwack·addon board 1.4/C64Saver2-addon.kicad_pcb

C64 Saver addon board layout, top view — open source AVR/Arduino board by bwack
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About the C64 Saver addon board

C64 Saver addon board is an open source AVR/Arduino PCB design by bwack, published on GitHub under the CERN-OHL-1.2 license. It is a 2-layer board measuring 43.9 × 29 mm, with 42 components from 25 distinct parts.

Its main chip is the ATTINY85-20SU, from the AVR/Arduino family. Other key parts include the INA219xIDR-SOIC, ISO1541D, ACPL-217-50DE, ACS712 and MCP1703Ax-500xxDB. By type, the board carries 14 resistors, 13 capacitors, 8 ICs, 5 connectors, 1 switch and 1 diode.

It belongs with the retro computing and displays & leds designs in this gallery.

From the project

C64 Saver v1 and v2 - Overvoltage protection for the C64 and its power brick.

C64 Saver v1 and v2 - Overvoltage protection for the C64 and its power brick.

Designed by BWACK 2018 CERN OPEN HARDWARE LICENSE v1.2 http://www.ohwr.org/

The KiCad and other design files are available on GitHub: https://github.com/bwack/

All text above must be included in any redistribution

The C64 Saver 2 is an open-source project intended to make overvoltage protection available and easy to make for anyone interested in using the old Commodore power brick together with the C64. The power brick is 30-40 years old, and it is known for failure with overvoltage. This is caused sometimes…

C64 Saver addon board, from the project README
From the project README

Main components on the C64 Saver addon board

INA219xIDR-SOICISO1541DATTINY85-20SUACPL-217-50DEACS712MCP1703Ax-500xxDBMCP1703

C64 Saver addon board bill of materials (BOM)

42 components, 25 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
INA219xIDR-SOIC
U1
1
ISO1541D
U2
1
ATTINY85-20SU
U3
2
ACPL-217-50DE
U4, U5
1
ACS712
U6
1
MCP1703Ax-500xxDB
U7
1
MCP1703
U8
1
AVR-ISP-6
CON1
2
Conn_01x08_Female
J1, J2
1
OLED_128x32_Conn_01x04_Male
J3
1
Conn_01x04_Female
J4
1
SW_Push
SW1
1
Dotec SL1G
D1
3
47uF
C1, C12, C13
5
100n
C2, C5, C8, C9, C11
4
1u
C3, C6, C7, C10
1
100nF
C4
2
560
R1, R3
1
0R1
R2
2
10K
R4, R13
Show 5 more
QtyPartRefs
1
470K
R5
1
470K
R6
5
4K7
R7, R8, R9, R10, R11
1
470
R12
1
1K
R14

C64 Saver addon board design files

The KiCad project lives in the bwack/C64-Saver-bwack repository on GitHub; these links point at the commit this page was built from.

C64 Saver addon board: common questions

What microcontroller does the C64 Saver addon board use?

The C64 Saver addon board is built around the ATTINY85-20SU, from the AVR/Arduino family.

How big is the C64 Saver addon board?

The C64 Saver addon board measures 43.9 × 29 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the C64 Saver addon board?

42 components, from 25 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the C64 Saver addon board design files?

From the bwack/C64-Saver-bwack repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the C64 Saver addon board design in my own project?

Yes, under the terms of its CERN-OHL-1.2 license, which bwack chose for the repository.

Can I test firmware for the C64 Saver addon board without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.

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