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K2500-PRAM

dojoe·K2500-PRAM

K2500-PRAM PCB layout, top view — open source board by dojoe

About the K2500-PRAM PCB

K2500-PRAM is an open source PCB design by dojoe, published on GitHub under the CC-BY-SA-4.0 license. It is a 4-layer board measuring 114.3 × 18.4 mm, with 7 components from 4 distinct parts.

Other key parts include the AS6C4008-55ZIN. By type, the board carries 4 capacitors, 2 ICs and 1 connector.

It belongs with the audio designs in this gallery.

From the project

A P/RAM extension remake for Kurzweil K2500 synthesizers

Because people are demanding upwards of 100$ on eBay for a part that is simple to make and costs about 20$.

It's basically just a 1MB SRAM board in a 512Kx16 configuration. The original board had eight 128Kx8 SRAMs and some address decoders, but thanks to modern technology we don't need that level of complexity as we can just tack two 512Kx8 SRAMs together. With that, the only tricky part is to get all those wires routed while keeping a low card profile, which is what I did.

K2500-PRAM, from the project README
From the project README

Main components on the K2500-PRAM

AS6C4008-55ZIN

K2500-PRAM bill of materials (BOM)

7 components, 4 distinct parts.

QtyPartRefs
2
AS6C4008-55ZIN
U1, U2
1
K2500-PRAM-CONN
J1
2
100n
C1, C2
2
1u
C3, C4

K2500-PRAM design files

The KiCad project lives in the dojoe/K2500-PRAM repository on GitHub; these links point at the commit this page was built from.

K2500-PRAM: common questions

How big is the K2500-PRAM PCB?

The K2500-PRAM measures 114.3 × 18.4 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the K2500-PRAM?

7 components, from 4 distinct parts. The full bill of materials is listed on this page.

Where can I download the K2500-PRAM design files?

From the dojoe/K2500-PRAM repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the K2500-PRAM design in my own project?

Yes, under the terms of its CC-BY-SA-4.0 license, which dojoe chose for the repository.

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