HardLabs

AudioSID

ddraig68k·hardware·expansion/AudioSID/AudioSID.kicad_pcb

AudioSID PCB layout, top view — open source board by ddraig68k

About the AudioSID PCB

AudioSID is an open source PCB design by ddraig68k, published on GitHub under the MIT license. It is a 4-layer board measuring 100 × 100 mm, with 69 components from 27 distinct parts.

Other key parts include the L7809 and XC9536PC44. By type, the board carries 35 capacitors, 16 connectors, 9 resistors, 4 ICs, 3 transistors and 1 diode.

It belongs with the audio designs in this gallery.

From the project

Schematic and CAD files for my 68K based computer

The MOS 6581/8580 SID is the sound chip used in the Commodore 64, with 3 independent oscillators, multiple waveforms, ADSR envelopes and a multi-mode filter giving it its distinctive sound.

This card has two SID sockets, each jumper-selectable between the original 6581 and the later 8580 variant, since the two chips have different characteristics - the 8580 cleaned up some of the 6581's non-linearities and runs from a 9V analog supply rather than the 6581's 12V. The board provides both rails, with an L7809 regulator supplying the 9V needed by the 8580.

Main components on the AudioSID

L7809XC9536PC44

AudioSID bill of materials (BOM)

69 components, 27 distinct parts.

QtyPartRefs
1
L7809
U1
1
XC9536PC44
U2
2
~
U3, U4
2
BC547
Q1, Q2
1
2N7000
Q3
1
D68K_64PIN_BOARD
J1
1
POT1
J2
1
POT2
J3
1
Audio Out
J4
1
Audio In
J5
1
JTAG
J6
2
SIDSEL_1
J7, J12
2
SIDSEL_2
J8, J13
2
SIDSEL_3
J9, J14
2
SIDSEL_4
J10, J15
2
SIDSEL_5
J11, J16
1
10K
RV1
1
Amber
D1
11
100nF
C1, C2, C3, C4, C5, C6, C18, C19 +3
8
1nF
C7, C9, C11, C15, C21, C23, C25, C29
Show 7 more
QtyPartRefs
4
22nF
C8, C13, C22, C27
6
470pf
C10, C14, C16, C24, C28, C30
6
10uF
C12, C17, C26, C31, C32, C35
1
220R
R1
4
1K
R2, R4, R5, R7
3
10K
R3, R6, R9
1
1M
R8

AudioSID design files

The KiCad project lives in the ddraig68k/hardware repository on GitHub; these links point at the commit this page was built from.

AudioSID: common questions

How big is the AudioSID PCB?

The AudioSID measures 100 × 100 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the AudioSID?

69 components, from 27 distinct parts. The full bill of materials is listed on this page.

Where can I download the AudioSID design files?

From the ddraig68k/hardware repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the AudioSID design in my own project?

Yes, under the terms of its MIT license, which ddraig68k chose for the repository.

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