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Dac

eshazen·scope-clock·hardware/dac/dac.kicad_pcb

Dac PCB layout, top view — open source board by eshazen

About the Dac PCB

Dac is an open source PCB design by eshazen, published on GitHub. It is a 4-layer board measuring 116.8 × 111.8 mm, with 56 components from 33 distinct parts.

Other key parts include the 6SN7, 74HCT245, 74LS138, DS1306 and IM6402. By type, the board carries 20 capacitors, 11 ICs, 8 connectors, 7 resistors, 3 switches and 3 diodes.

It belongs with the retro computing designs in this gallery.

From the project

This is the control/interface board, designed to work with the Z80 CPU board from my retro-25 calculator project git.

This is the control/interface board, designed to work with the Z80 CPU board from my retro-25 calculator project git.

MAX503/530 DAC. Needs 1 address bit and 8 bit data with strobe. UART with FT232 USB interface. Thinking of IM6402 since it's dead simple. Needs a 16X clock. Buttons, encoders, maybe a couple of LED drives Z-axis drive (9-12V to J2 on CRT board; could be +/-5V) * Real-time clock e.g. DS1306

Main components on the Dac

6SN774HCT24574LS138DS1306IM6402MAX50374LS13974LS161

Dac bill of materials (BOM)

56 components, 33 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
6SN7
74HC4040
U1
1
6SN7
74LS08
U2
1
6SN7
74LS174
U3
1
74HCT245
U4
1
74LS138
U5
1
DS1306
U6
1
IM6402
U7
2
MAX503
U8, U9
1
74LS139
U10
1
74LS161
U11
1
2N3906
Q1
1
4.9152MHz
X1
1
32.768 kHz
Y1
1
CONN_01X02
Conn_01x04
J1
1
CONN_01X04
Conn_02x08_Odd_Even
J2
1
CONN_01X03
Conn_02x08_Odd_Even
J3
1
CONN_01X06
Conn_02x08_Odd_Even
J4
2
Conn_01x02
J5, J8
1
Conn_01x04
J6
1
Conn_01x04
J7
Show 13 more
QtyPartRefs
1
Battery_Cell
BT1
2
SW_SPST
SW1, SW2
1
EN11-VSM1AF20
SW3
3
LED
D1, D2, D3
10
0.1uF
C1, C2, C5, C6, C11, C12, C13, C16 +2
2
0.025UF
0.1uF
C3, C4
2
220PF
0.1uF
C7, C8
2
0.1UF
0.1uF
C9, C10
2
33uF
C14, C15
2
3.3uF 10V
C17, C18
3
1.2k
R1, R2, R3
2
10k
R4, R7
2
1k
R5, R6

Dac design files

The KiCad project lives in the eshazen/scope-clock repository on GitHub; these links point at the commit this page was built from.

Dac: common questions

How big is the Dac PCB?

The Dac measures 116.8 × 111.8 mm, has 4 copper layers and is 1.600198 mm thick.

How many components are on the Dac?

56 components, from 33 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 Dac design files?

From the eshazen/scope-clock 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 Dac design in my own project?

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

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