Transistor Calculator V2
About the Transistor Calculator V2 PCB
Transistor Calculator V2 is an open source PCB design by Alex-Hermeling, published on GitHub. It is a 2-layer board measuring 95 × 60.2 mm, with 63 components from 16 distinct parts.
By type, the board carries 29 resistors, 19 transistors, 6 jumpers, 4 connectors and 3 diodes.
From the project
A repo to store all of the KiCad files for this project
V0.1 has many problems with the schematic and the PCB design. First, the schematic contains a mistake with both XOR segments. A wire is supposed to go from the right resistor under Q10 to 5V and from the right resistor under Q14 to 5V. Also, the design of the PCB is flawed because it is hard to hand-solder. While designing this PCB, I was too focused on saving space, which should not have been the case for the first version. The input and output holes were too small to fit any regular-size wire. All of these problems were fixed in V0.3.
Transistor Calculator V2 bill of materials (BOM)
63 components, 16 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 19 | 2N3904 | TO-92_HandSolder | Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8 +11 |
| 1 | 5V_In | Pin_D1.0mm_L10.0mm_LooseFit | J1 |
| 1 | GND_In | Pin_D1.0mm_L10.0mm_LooseFit | J2 |
| 1 | 5V_Out | Pin_D1.0mm_L10.0mm_LooseFit | J3 |
| 1 | GND_Out | Pin_D1.0mm_L10.0mm_LooseFit | J4 |
| 1 | ~ | SolderWire-0.5sqmm_1x03_P4.6mm_D0.9mm_OD2.1mm | Input_Pins1 |
| 5 | ~ | SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP1, JP2, JP3, JP4, JP5 |
| 1 | ~ | SolderJumper-3_P1.3mm_Open_RoundedPad1.0x1.5mm | JP6 |
| 1 | ~ | SolderWire-0.5sqmm_1x02_P4.6mm_D0.9mm_OD2.1mm | Output_Pins1 |
| 1 | PWR_LED | LED_D5.0mm | D1 |
| 2 | D | D_A-405_P2.54mm_Vertical_AnodeUp | D2, D3 |
| 6 | 10K 220K | R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R1, R2, R3, R5, R6, R7 |
| 2 | 10K 47K | R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R4, R8 |
| 17 | 330 220K | R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R9, R10, R11, R12, R13, R14, R15, R17 +9 |
| 3 | 330 47K | R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R16, R24, R28 |
| 1 | 330 150 | R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R29 |
Transistor Calculator V2 design files
The KiCad project lives in the Alex-Hermeling/Transistor-Calculator repository on GitHub; these links point at the commit this page was built from.
Transistor Calculator V2: common questions
How big is the Transistor Calculator V2 PCB?
The Transistor Calculator V2 measures 95 × 60.2 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Transistor Calculator V2?
63 components, from 16 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 Transistor Calculator V2 design files?
From the Alex-Hermeling/Transistor-Calculator 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 Transistor Calculator V2 design in my own project?
The repository has no license, so all rights stay with Alex-Hermeling. Use it as a reference, and ask the author before reusing the design.
