HardLabs

Lts74x

ole00·lts74x·design/lts74x.kicad_pcb

Lts74x PCB layout, top view — open source board by ole00

About the Lts74x PCB

Lts74x is an open source PCB design by ole00, published on GitHub under the MIT license. It is a 2-layer board measuring 85.1 × 67.3 mm, with 64 components from 18 distinct parts.

Other key parts include the PCA9557D. By type, the board carries 50 resistors, 5 switches, 2 transistors, 2 connectors, 2 capacitors and 1 IC.

It belongs with the displays & leds designs in this gallery.

From the project

74x-series IC logic tester for 16,18 and 20 pin ICs. Based on Arduino Nano.

Lts74x was inspired by the following projects: Integrated circuit tester: https://github.com/Johnlon/integrated-circuit-tester Smart IC Tester: https://github.com/akshaybaweja/Smart-IC-Tester

Features: Uses Arduino Nano and one GPIO Expander IC Tests many 16 and 18 pin 74x series ICs, test database is based on the above projects. Tests some 20 pin 74x series ICs, requires Arduino Nano modification (LED and pull resistor removals) Uses OLED screen for IC selection Displays basic IC pinout and indicates failed pins after the test. Screen saver to prevent OLED screen burn. Supports testing Z…

Lts74x, from the project README
From the project README

Main components on the Lts74x

PCA9557D

Lts74x bill of materials (BOM)

64 components, 18 distinct parts.

QtyPartRefs
1
PCA9557D
U1
1
N_MOS
Q1
1
TO-92L_Inline
Q2
1
ZIF Socket
J1
1
OLED SSD1306
J2
1
OK (2V2)
SW1
1
Down (1V6)
SW2
1
Up (1V1)
SW3
1
Back (2V7)
SW4
1
SW_Push_DPDT
SW5
1
TestPoint_Small
TP1
1
LED
D1
1
0.1u
C2
1
22u
C4
19
1k
R1, R2, R3, R4, R5, R6, R7, R8 +11
18
470k
R19, R20, R21, R22, R23, R24, R25, R26 +10
11
10k
R37, R38, R39, R40, R41, R42, R43, R44 +3
2
2k2
R46, R48

Lts74x design files

The KiCad project lives in the ole00/lts74x repository on GitHub; these links point at the commit this page was built from.

Lts74x: common questions

How big is the Lts74x PCB?

The Lts74x measures 85.1 × 67.3 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Lts74x?

64 components, from 18 distinct parts. The full bill of materials is listed on this page.

Where can I download the Lts74x design files?

From the ole00/lts74x repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Lts74x design in my own project?

Yes, under the terms of its MIT license, which ole00 chose for the repository.

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