HardLabs

A2E IOU SpeakerReplacement

hkzlab·A2E_IOU_SpeakerReplacement·board/A2E_IOU_spkr/A2E_IOU_spkr.kicad_pcb

A2E IOU SpeakerReplacement PCB layout, top view — open source board by hkzlab

About the A2E IOU SpeakerReplacement PCB

A2E IOU SpeakerReplacement is an open source PCB design by hkzlab, published on GitHub under the CC-BY-SA-4.0 license. It is a 2-layer board measuring 33 × 55.9 mm, with 6 components from 5 distinct parts.

Other key parts include the GAL16V8 and 74LS373. By type, the board carries 2 ICs, 2 connectors and 2 capacitors.

It belongs with the audio and retro computing designs in this gallery.

From the project

Apple IIe IOU Speaker decoding replacement circuitry

NOTE: While I'm pretty sure my prototype works and is wired like the schematics you find in this project, I've yet to receive the PCBs from the producers and test them. I will remove this warning once I'll be able to test one.

While the original Apple ][ computers where completely built out of off-the-shelf integrated circuits, the newer "enhanced" units (//e, ][e) used custom ICs (IOU and MMU) to replace a lot of the old logic. This was done both as a cost cutting measure and as a way to hinder the creation of clones.

A2E IOU SpeakerReplacement, from the project README
From the project README

Main components on the A2E IOU SpeakerReplacement

GAL16V874LS373

A2E IOU SpeakerReplacement bill of materials (BOM)

6 components, 5 distinct parts.

QtyPartRefs
1
GAL16V8
U1
1
74LS373
U2
1
IOU_Socket
J1
1
PCB_Socket
J2
2
100nF
C1, C2

A2E IOU SpeakerReplacement design files

The KiCad project lives in the hkzlab/A2E_IOU_SpeakerReplacement repository on GitHub; these links point at the commit this page was built from.

A2E IOU SpeakerReplacement: common questions

How big is the A2E IOU SpeakerReplacement PCB?

The A2E IOU SpeakerReplacement measures 33 × 55.9 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the A2E IOU SpeakerReplacement?

6 components, from 5 distinct parts. The full bill of materials is listed on this page.

Where can I download the A2E IOU SpeakerReplacement design files?

From the hkzlab/A2E_IOU_SpeakerReplacement repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the A2E IOU SpeakerReplacement design in my own project?

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

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