2 layers39.5 × 80.5 mm
Cem3340-vco
carr-james/cem3340-vco
A clone of Kassutronics 3340. Entirely for the purpose of learning how to build a Eurorack module, start to finish.
58 parts7
2 layers38 × 120 mm
A 44 component rugged temperature-indicating PCB using solar power and a supercapacitor. Board is designed to fit in a durable and cost efficent enclosure (PET bottle prefab) and sized exactly to the solar panel.
- Size
- 38 × 120 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 51
- Nets
- 35
- Pads
- 135
- Tracks, vias
- 244, 0
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 18 Oct 2023
- Updated
- 18 Oct 2023
Overview
Temp is an open-source printed circuit board by uel, from the uel/temperature-indicator repository on GitHub. It is a 2-layer board of 38 × 120 mm with 51 parts on 35 nets, routed with 244 tracks and 0 vias.
It is built around the LM3914N-1 and LP2950-33. Its parts include 22 diodes, 12 resistors, 5 capacitors, 5 ICs and 1 switch.
Main components
2README
readme.mdTemperature Indicator
A 44 component rugged temperature-indicating PCB using solar power and a supercapacitor. Board is designed to fit in a durable and cost efficent enclosure (PET bottle prefab) and sized exactly to the solar panel. Powered by supercapacitor to retain charge during low temperatures.
| Front | Back |
|---|---|
 |  |
Parts
51| Qty | Value | Footprint | References |
|---|---|---|---|
| 20 | D | LED_THT:LED_D3.0mm | D3, D4, D5, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22 +4 |
| 4 | 1k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R5, R7, R9 |
| 3 | 500 | Potentiometer_THT:Potentiometer_Piher_PT-6-V_Vertical | R6, R8, R10 |
| 2 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R2, R11 |
| 2 | 68k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R3, R12 |
| 2 | Conn_01x01_Male | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | 5V, GND |
| 2 | D_Schottky | Diode_THT:D_DO-35_SOD27_P10.16mm_Horizontal | D1, D2 |
| 2 | LM3914N | Package_DIP:DIP-18_W7.62mm | U4, U5 |
| 1 | 0.1u | Capacitor_THT:C_Rect_L7.0mm_W2.0mm_P5.00mm | C3 |
| 1 | 100u | Capacitor_THT:CP_Radial_D6.3mm_P2.50mm | C4 |
| 1 | 1F | footprints:CAP_DB-5R5D155T | C2 |
| 1 | 1u | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | C1 |
| 1 | 20k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R4 |
| 1 | 20u | Capacitor_THT:CP_Radial_D6.3mm_P2.50mm | C5 |
| 1 | 47u | Inductor_THT:L_Axial_L9.5mm_D4.0mm_P12.70mm_Horizontal_Fastron_SMCC | L1 |
| 1 | CE8301 | Package_TO_SOT_SMD:SOT-89-3_Handsoldering | U2 |
| 1 | LM35-LP | Package_TO_SOT_THT:TO-92 | U3 |
| 1 | LP2950 | Package_TO_SOT_THT:TO-92_Inline | U1 |
| 1 | SW_SPST | Capacitor_THT:C_Radial_D6.3mm_H11.0mm_P2.50mm | SW1 |
| 1 | Solar+ | Connector_Wire:SolderWire-2sqmm_1x01_D2mm_OD3.9mm | Solar+ |
| 1 | Solar- | Connector_Wire:SolderWire-2sqmm_1x01_D2mm_OD3.9mm | Solar- |
| 1 | TestPoint | TestPoint:TestPoint_Pad_D2.0mm | TP1 |
Questions
How big is the Temp PCB?
It measures 38 × 120 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Temp use?
51 parts, built around the LM3914N-1 and LP2950-33. 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.
Where can I download the Temp KiCad files?
From the uel/temperature-indicator repository on GitHub, at the commit this page was made from: the board is project/temp.kicad_pcb and its schematic project/supply.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Temp design in my own project?
Its repository states no licence, so its author keeps all rights: ask uel before reusing the design.
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