
RADSAT SK Timer 2
USST-RADSAT-SK/power-and-electrical
PCB Schematics and Layout for the RADSAT-SK Timer and Inhibits board, currently orbiting earth!

PCB Schematics and Layout for the RADSAT-SK Timer and Inhibits board, currently orbiting earth!
RADSAT SK Timer is an open-source printed circuit board by USST-RADSAT-SK, from the USST-RADSAT-SK/power-and-electrical repository on GitHub. It is a 2-layer board of 90.2 × 95.9 mm with 125 parts on 77 nets, routed with 581 tracks and 58 vias.
It is built around the CPC1117N, LM397MF and CD4052BM, with the 5.0SMDJ5.0A and BAT54CDW among its other parts. Its parts include 56 resistors, 18 capacitors, 15 transistors, 9 ICs and 8 connectors.
Gitbash is a terminal that you use to execute "git" commands and its highly recommended that you download it
Use the following link https://git-scm.com/downloads
Make a folder on your local drive (I make a folder on my desktop)
go into that folder and right click and open gitbash at that location
find the green button in the github that says "Code"
click and copy the URL
go back into the gitbash enter
"git clone [URL]"
Now if you want to make changes to a file please make a branch
Say you want to do a quick check on the progress for the PCB board
use the following commands in git bash
"git checkout [name of branch]"
In the case that KiCad is not updating automatically use the following procedure:
If you quickly want to check when the last changes were done to a branch use
"git log"
scroll up & you will see the most recent commit and who did it
a branch is like a copy of files that you can edit on your local drive where you dont have to worry about messing up the main code
make sure you are in the right directory
"git branch [name of the branch]"
keep the name of the branch short and sweet no need to make it complitcated
Once gitbash is opened you want to make sure you are in the right file directory you want to use the command
"git status"
to check if you saved your files (it will show up as red)
"Git add [filename]"
this will prepare your file to be commited
"git status"
the file name should be green now
"git commit -m "[changes you made as a comment]" "
this will commit your changes
"git push"
this will save your changes into the branch
| Qty | Value | Footprint | References |
|---|---|---|---|
| 18 | 1k | Resistor_SMD:R_0805_2012Metric | R108, R109, R110, R112, R127, R128, R129, R130, R131, R132, R135, R136, R209, R210, R212, R214 +2 |
| 15 | IRLML2060 | Package_TO_SOT_SMD:SOT-23_Handsoldering | Q101, Q102, Q103, Q104, Q105, Q106, Q107, Q108, Q109, Q201, Q202, Q204, Q205, Q206, Q207 |
| 12 | 100 | Resistor_SMD:R_0805_2012Metric | R102, R111, R115, R116, R133, R134, R202, R204, R211, R213, R215, R220 |
| 11 | 1M | Resistor_SMD:R_0805_2012Metric | R101, R103, R107, R113, R114, R117, R118, R124, R126, R203, R221 |
| 8 | 100n | Capacitor_SMD:C_0805_2012Metric | C103, C104, C109, C110, C111, C112, C113, C114 |
| 6 | 330u | Capacitor_Tantalum_SMD:CP_EIA-7343-30_AVX-N_Pad2.25x2.55mm_HandSolder | C101, C102, C105, C106, C107, C108 |
| 6 | SW_Push | Connector_Hirose:Hirose_DF13-02P-1.25DSA_1x02_P1.25mm_Vertical | SW201, SW202, SW203, SW204, SW205, SW206 |
| 4 | CPC1117N | Package_SO:SOP-4_3.8x4.1mm_P2.54mm | U230, U240, U250, U260 |
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3_ISO7380_Pad_TopBottom | H101, H102, H103, H104 |
| 3 | 1K | Resistor_SMD:R_0805_2012Metric | R104, R119, R120 |
| 3 | 3.48M | Resistor_SMD:R_0805_2012Metric | R105, R121, R122 |
| 3 | 442K | Resistor_SMD:R_0805_2012Metric | R106, R123, R125 |
| 3 | Conn_01x02 | Connector_Hirose:Hirose_DF13-02P-1.25DSA_1x02_P1.25mm_Vertical | J204, J205, J206 |
| 3 | LM397MF | Package_TO_SOT_SMD:TSOT-23-5_HandSoldering | U101, U102, U103 |
| 2 | Battery_Cell | Battery:BatteryHolder_Keystone_1060_1x2032 | BT201, BT202 |
| 2 | Conn_02x26_Odd_Even | Connector_PinSocket_2.54mm:PinSocket_2x26_P2.54mm_Vertical | J101, J103 |
| 2 | LED | LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D205, D206 |
| 1 | 0.1uF | Capacitor_SMD:C_0805_2012Metric | C205 |
| 1 | 1.5nF | Capacitor_SMD:C_0805_2012Metric | C207 |
| 1 | 10uF | Capacitor_SMD:C_0805_2012Metric | C204 |
| 1 | 10uH | Sumida_inductor:Sumida_inductor | L201 |
| 1 | 15k | Resistor_SMD:R_0805_2012Metric | R206 |
| 1 | 200k | Resistor_SMD:R_0805_2012Metric | R208 |
| 1 | 22uF | Capacitor_SMD:C_1210_3225Metric_Pad1.33x2.70mm_HandSolder | C208 |
| 1 | 3M | Resistor_SMD:R_0805_2012Metric | R201 |
| 1 | 5.0SMDJ5.0A | Diode_SMD:D_SMC_Handsoldering | D201 |
| 1 | 5.1M | Resistor_SMD:R_0805_2012Metric | R137 |
| 1 | 60.4K | Resistor_SMD:R_0805_2012Metric | R205 |
| 1 | 619k | Resistor_SMD:R_0805_2012Metric | R207 |
| 1 | BAT54CDW | Package_TO_SOT_SMD:SOT-363_SC-70-6_Handsoldering | D204 |
| 1 | CD4052B | Package_SO:TSSOP-16_4.4x5mm_P0.65mm | U104 |
| 1 | Conn_01x03 | Connector_Hirose:Hirose_DF13C_CL535-0403-5-51_1x03-1MP_P1.25mm_Vertical | J203 |
| 1 | Conn_01x05 | Connector_Hirose:Hirose_DF13-05P-1.25DSA_1x05_P1.25mm_Vertical | J202 |
| 1 | Conn_01x07 | Connector_Molex:Molex_PicoBlade_53047-0710_1x07_P1.25mm_Vertical | J201 |
| 1 | LOGO | USSTlogo:USSTLOGO | G*** |
| 1 | LTC3440EMSPBF | Package_SO:MSOP-10_3x3mm_P0.5mm | U202 |
| 1 | MBRM120LT3G | Diode_SMD:D_Powermite_AK | D203 |

USST-RADSAT-SK/power-and-electrical
PCB Schematics and Layout for the RADSAT-SK Timer and Inhibits board, currently orbiting earth!



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It measures 90.2 × 95.9 mm and has 2 copper layers, 1.6 mm thick.
125 parts, built around the CPC1117N, LM397MF, CD4052BM and 5.0SMDJ5.0A. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
From the USST-RADSAT-SK/power-and-electrical repository on GitHub, at the commit this page was made from: the board is RADSAT-SK Timer/RADSAT-SK Timer.kicad_pcb and its schematic 555_timer/555_timer.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Its repository states no licence, so its author keeps all rights: ask USST-RADSAT-SK before reusing the design.