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RetroCom

SamyIOoOI·RetroCom·KiCad_PCB_Source/RetroCom.kicad_pcb

RetroCom PCB layout, top view — open source board by SamyIOoOI
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About the RetroCom PCB

RetroCom is an open source PCB design by SamyIOoOI, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 190 × 111 mm, with 84 components from 53 distinct parts.

Other key parts include the AT89C55WD-24PU, 757, LM386, CD4051B and MAX485E. By type, the board carries 22 capacitors, 22 resistors, 14 ICs, 7 switches, 5 connectors and 4 diodes.

It belongs with the retro computing designs in this gallery.

From the project

A 4-Station one-to-one two-way INTERCOM built around the AT89C52-PI24 RetroMCU (8051 Core).

- AT89C52-PI24 MCU per Station. [Handles Interstation Communication & Interface]. - Supports two-way simultaneous speech. No taking turns when talking. RetroCom functions just like a phonecall. - All stations are connected to main station directly via CAT6 Cables. Distances of 20M (Meters) to 30M are OK . - Switching is done by CD4051 & CD4052 ICs powered with negative & postive 5 V Rails. PreAmped Signals face no distortion. - Audio undergoes a preamp stage under the TL072 & power amp stage under the LM386. - The main station has a built in Radio Module. [As of Version 1.0 [WIRED] the radio…

RetroCom, from the project README
From the project README

Main components on the RetroCom

AT89C55WD-24PU757LM386CD4051BMAX485EICL7660CD4052BuA7805TL072uA7833

RetroCom bill of materials (BOM)

84 components, 53 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
AT89C55WD-24PU
U1
1
757
U2
1
LM386
U3
1
CD4051B
U4
3
MAX485E
U5, U6, U11
1
ICL7660
U8
1
~
U9
1
CD4052B
U10
1
uA7805
U12
1
TL072
U18
1
~
U29
1
uA7833
U31
3
S8050
Q1, Q2, Q3
1
11.0592MHz
Y1
1
32.768 kHz
Y2
1
Antenna
J1
1
Station 2 Cable [Ethernet]
J2
1
Station 3 Cable [Ethernet]
J3
1
Station 4 Cable [Ethernet]
J4
1
Conn_01x02_Pin
J5
Show 33 more
QtyPartRefs
1
Mic Volume Control
10K1
1
Buzzer
BZ1
1
Station 1 Speaker
LS1
1
Microphone
MK2
1
Volume Control Station 1
RV6
1
Call Button
SW1
1
Hang Button
SW2
1
Scroll Button
SW3
1
Radio Button
SW4
1
Speaker Switch
SW17
1
Radio Button 2
SW21
1
POWER_SWITCH
SW22
1
Yellow Hold LED
D1
1
Green Call LED
D2
1
Red Power LED
D3
1
Orange Speaker Switch LED
D14
2
33pF
C1, C2
8
0.1 uF
C3, C4, C5, C12, C14, C26, C28, C41
3
10 uF
C6, C23, C24
1
220 uF
C11
1
4700 uF
C27
4
47 uF
C42, C45, C46, C70
2
100 nF
C43, C44
1
100pF
C69
9
10K
R1, R3, R6, R7, R8, R10, R11, R22 +1
3
4.7K
R2, R9, R12
1
10
R4
1
2.2K
R5
4
470
R18, R19, R26, R50
1
47k
R20
1
100k
R21
1
47
R24
1
220K
R25

RetroCom design files

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

RetroCom: common questions

How big is the RetroCom PCB?

The RetroCom measures 190 × 111 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the RetroCom?

84 components, from 53 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 RetroCom design files?

From the SamyIOoOI/RetroCom 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 RetroCom design in my own project?

Yes, under the terms of its GPL-3.0 license, which SamyIOoOI chose for the repository.

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