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D50mram

dojoe·roland-mram-card·mram-card/d50mram.kicad_pcb

D50mram PCB layout, top view — open source board by dojoe
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About the D50mram PCB

D50mram is an open source PCB design by dojoe, published on GitHub. It is a 2-layer board measuring 86 × 54 mm, with 41 components from 14 distinct parts.

Other key parts include the EST-MR2A08A, MIC5265-3.3YD5, 74LVX541, 74LVX4245 and 74HC02. By type, the board carries 14 capacitors, 9 resistors, 8 ICs, 6 jumpers, 3 switches and 1 test point.

It belongs with the test & measurement designs in this gallery.

From the project

A multi-bank MRAM based memory card for Roland instruments

[](mr-revd-front.jpg) (click to enlarge)

This is a replacement memory card for old Roland instruments of the late 80s and early 90s, such as the D-50 synthesizers, the JV-1080 and JV-2080 rack synths or the JD-880. It is meant to replace memory cards of the M-128, M-256 and M-512 lines (including M-256E, M-512G and all other suffixes). Some Akai devices from the same age actually use a compatible card format (BR-16 and BR-32) and this card will work in those too.

D50mram, from the project README
From the project README

Main components on the D50mram

EST-MR2A08AMIC5265-3.3YD574LVX54174LVX424574HC02

D50mram bill of materials (BOM)

41 components, 14 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
EST-MR2A08A
U1
1
MIC5265-3.3YD5
U2
3
74LVX541
U3, U4, U5
1
74LVX4245
U6
2
74HC02
U7, U8
6
JUMPER3
JP1, JP2, JP3, JP4, JP5, JP6
1
SPDT
SW1
2
SP4T
SW2, SW3
1
CONN_6
TP1
2
1uF X7R
C1, C2
9
100n
C3, C4, C5, C6, C7, C8, C9, C10 +1
3
100p
C12, C13, C14
4
100R
R1, R2, R3, R4
5
10k
RN1, RN2, RN3, RN4, RN5

D50mram design files

The KiCad project lives in the dojoe/roland-mram-card repository on GitHub; these links point at the commit this page was built from.

D50mram: common questions

How big is the D50mram PCB?

The D50mram measures 86 × 54 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the D50mram?

41 components, from 14 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 D50mram design files?

From the dojoe/roland-mram-card 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 D50mram design in my own project?

The repository has no license, so all rights stay with dojoe. Use it as a reference, and ask the author before reusing the design.

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