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2 layers68.3 × 57.3 mm2 stage BJT opamp, the printed circuit board in 3D

2 stage BJT opamp

meekdenzo/capstone1
Full screenGitHub.kicad_pcb
Size
68.3 × 57.3 mm
Copper layers
2
Thickness
1.6 mm
Parts
35
Nets
26
Pads
82
Tracks, vias
206, 27
Pours
1
Routed
Yes
KiCad
KiCad 8.0 (file 20240108)
Created
7 Nov 2024
Updated
4 Aug 2025

Overview

2 stage BJT opamp is an open-source printed circuit board by meekdenzo, from the meekdenzo/capstone repository on GitHub. It is a 2-layer board of 68.3 × 57.3 mm with 35 parts on 26 nets, routed with 206 tracks and 27 vias.

It is built around the MMBT3904, MMBT3906 and MMDT3904, with the MMDT3906 among its other parts. Its parts include 14 resistors, 7 transistors, 2 capacitors, 1 diode and 1 connector.

Main components

4

Parts

35
QtyValueFootprintReferences
810Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolderR2, R4, R6, R7, R11, R12, R13, R14
7TestPointTestPoint:TestPoint_Pad_1.5x1.5mmTP1/VDD, TP2/OUT, TP3/TRIM, TP4/NET, TP5/VSS, TP6/TAIL, TP7/MIRROR
4MMBT3904Package_TO_SOT_SMD:SOT-23Q1, Q2, Q5, Q9
2-500 ΩAAMU Senior Design 2024-25:TRIM_3306F-1-501Vos Trim, Zero
2100Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolderR8, R9
2220Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolderR3, R5
10.001 uFCapacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolderC1
110 uFCapacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolderC2
1500 ΩAAMU Senior Design 2024-25:TRIM_3306F-1-501BiasCurrent
1680 ΩResistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolderR1
1Conn_01x05Connector_PinSocket_2.54mm:PinSocket_1x05_P2.54mm_HorizontalJ1
1DNPResistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolderR10
1LEDLED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolderD1
1MMBT3906Package_TO_SOT_SMD:SOT-23Q8
1MMDT3904Package_TO_SOT_SMD:SOT-363_SC-70-6Q3
1MMDT3906Package_TO_SOT_SMD:SOT-363_SC-70-6Q4

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Questions

How big is the 2 stage BJT opamp PCB?

It measures 68.3 × 57.3 mm and has 2 copper layers, 1.6 mm thick.

What parts does the 2 stage BJT opamp use?

35 parts, built around the MMBT3904, MMBT3906, MMDT3904 and MMDT3906. 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 2 stage BJT opamp KiCad files?

From the meekdenzo/capstone repository on GitHub, at the commit this page was made from: the board is 2 stage BJT opamp/2 stage BJT opamp.kicad_pcb and its schematic 2 stage BJT opamp/2 stage BJT opamp.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the 2 stage BJT opamp design in my own project?

Its repository states no licence, so its author keeps all rights: ask meekdenzo before reusing the design.