HardLabs

Squarely

Broosky·Squarely·KiCad/Squarely.kicad_sch

This repository ships a schematic but no board layout.
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About the Squarely PCB

Squarely is an open source PCB design by Broosky, published on GitHub. It is a board, with 64 components from 21 distinct parts.

Other key parts include the LM350 TO220, 74LS47, LM555xN, 4017 and 74LS90. By type, the board carries 22 resistors, 17 capacitors, 10 ICs, 8 connectors and 5 diodes.

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

From the project

A super low-frequency square wave counter using 74-series logic and 7-segment displays.

A super low-frequency square wave counter originally built back in high school, designed for basic signal counting and hands-on hardware experimentation. It uses classic 74-series logic to drive a multi-digit display and can be expanded or tuned for various applications.

Reflecting on the original design, here are a few areas worth improving:

- Replace discrete resistors with a resistor bank for cleaner layout and easier substitutions. - Adjust the 555 timer's RC values to support higher input frequencies (up to low MHz). - Add a third digit to extend the count range. - Use logic chips from…

Main components on the Squarely

LM350 TO22074LS47LM555xN401774LS9074LS273HDSP-A151

Squarely bill of materials (BOM)

64 components, 21 distinct parts.

QtyPartRefs
1
LM350 TO220
U1
2
74LS47
U2, U3
1
LM555xN
U4
1
4017
U5
2
74LS90
U6, U7
1
74LS273
U8
2
HDSP-A151
U9, U10
8
5V Bus
J1, J2, J3, J4, J5, J6, J7, J8
1
Heatsink Pad
HS1
1
5k
RV1
1
1N4148
D1
4
LED
D2, D3, D4, D5
6
47uF
C1, C6, C7, C10, C17, C18
8
47nF
C2, C3, C5, C8, C13, C14, C15, C16
1
22uF
C4
1
150nF
C11
1
10uF
C12
2
5k1
R1, R3
18
470R
R2, R4, R5, R6, R7, R8, R9, R10 +10
1
240R
R18
Show 1 more
QtyPartRefs
1
10k
R20

Squarely design files

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

Squarely: common questions

How many components are on the Squarely?

64 components, from 21 distinct parts. The full bill of materials is listed on this page.

Where can I download the Squarely design files?

From the Broosky/Squarely repository on GitHub, which has the schematic; the links under Design files point to each one.

Can I use the Squarely design in my own project?

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

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