Schreibtischlampe
About the Schreibtischlampe PCB
Schreibtischlampe is an open source PCB design by michaelwittner, published on GitHub. It is a 2-layer board measuring 64.8 × 57.2 mm, with 22 components from 17 distinct parts.
Other key parts include the NE555P and 4017. By type, the board carries 4 resistors, 3 transistors, 3 connectors, 3 diodes, 3 capacitors and 2 ICs.
From the project
A touch lamp for workshops in HTL Steyr
Q1: $I{B} = \frac{I{L}}{h_{FE}} = \frac{400\text{mA}}{400}$ = 1mA
$R = \frac{U{4017}}{I{B}} = \frac{4.7\text{V}}{1\text{mA}}$ = 4.7kOhm
Q2: $I{B} = \frac{I{L}}{h_{FE}} = \frac{320\text{mA}}{400}$ = 0.8mA
$R = \frac{U{4017}}{I{B}} = \frac{4.7\text{V}}{0.8\text{mA}}$ = 5.8kOhm
Q3: $I{B} = \frac{I{L}}{h_{FE}} = \frac{150\text{mA}}{400}$ = 0.38mA
$R = \frac{U{4017}}{I{B}} = \frac{4.7\text{V}}{0.38\text{mA}}$ = 12.4kOhm
Main components on the Schreibtischlampe
Schreibtischlampe bill of materials (BOM)
22 components, 17 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | NE555P | DIP-8_W7.62mm | U1 |
| 1 | 4017 | DIP-16_W7.62mm | U2 |
| 2 | BC547 | TO-92L_HandSolder | Q1, Q2 |
| 1 | BDX53BG | TO-220-3_Vertical | Q3 |
| 1 | Versorgung | TerminalBlock_Phoenix_MKDS-1,5-2_1x02_P5.00mm_Horizontal | J1 |
| 1 | Lampenkopf | TerminalBlock_Phoenix_MKDS-1,5-3_1x03_P5.00mm_Horizontal | J2 |
| 1 | Messpunkte | PinHeader_1x02_P2.54mm_Vertical | J5 |
| 2 | 100k | Potentiometer_ACP_CA9-V10_Vertical | RV1, RV2 |
| 1 | 5M | Potentiometer_ACP_CA9-V10_Vertical | RV3 |
| 1 | Recom Netzteil | Recom_Netzteil_Footprint | U_Netzteil1 |
| 3 | 1N4148 | D_DO-35_SOD27_P7.62mm_Horizontal | D1, D2, D3 |
| 1 | 4,7µ | CP_Radial_D4.0mm_P2.00mm | C1 |
| 2 | 100n | CP_Radial_Tantal_D4.5mm_P5.00mm | C2, C3 |
| 1 | 1M | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1 |
| 1 | 220k | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R2 |
| 1 | 4,7k | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R3 |
| 1 | 6k8 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R5 |
Schreibtischlampe design files
The KiCad project lives in the michaelwittner/2526_5AHEL_LA_Schreibtischlampe repository on GitHub; these links point at the commit this page was built from.
Schreibtischlampe: common questions
How big is the Schreibtischlampe PCB?
The Schreibtischlampe measures 64.8 × 57.2 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Schreibtischlampe?
22 components, from 17 distinct parts. The full bill of materials is listed on this page.
Where can I download the Schreibtischlampe design files?
From the michaelwittner/2526_5AHEL_LA_Schreibtischlampe repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Schreibtischlampe design in my own project?
The repository has no license, so all rights stay with michaelwittner. Use it as a reference, and ask the author before reusing the design.
More boards in 2526_5AHEL_LA_Schreibtischlampe
Earlier revisions in the repo: Schreibtischlampe_V4, Schreibtischlampe_V3