
Dummyload
STWuRCA-diy/DUMMYLOAD_V2
Open-source electronic dummy load for testing high-voltage linear power supplies (tube amplifier PSUs). Adjustable current load, measurement and protection. Includes PCB, firmware and enclosure.

Custom AMC3302-based Precision Full-Wave Rectifier Analog PCB
RP AMC3302 Zu is an open-source printed circuit board by ZivojinV, from the ZivojinV/AMC3302 repository on GitHub. It is a 2-layer board of 40.5 × 55.4 mm with 62 parts on 31 nets, routed with 370 tracks and 12 vias.
It is built around the MCP6022-I/P, AMC3302QDWERQ1 and TL431, with the LM78L05, STPS2H100 and 2PIN among its other parts. Its parts include 19 capacitors, 16 resistors, 6 ICs, 4 diodes and 4 connectors.
Custom AMC3302-based full-wave rectifier PCB for AC signal measurement and conditioning.
The input AC signal is measured using the AMC3302 isolated amplifier and further processed through a dual MCP6022 stage to produce a full-wave rectified output.
The system was iteratively tested and validated through signal measurement and analysis to ensure correct behavior and stable output.
Images:
Empty PCB

Assembled PCB

Signal verification through measurement:
Input signal

Rectified output signal

Input vs Output comparison

Additional capacitors were introduced after testing to reduce noise and improve output signal stability.
| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | PAD | TestPoint:TestPoint_THTPad_D1.5mm_Drill0.7mm | TP1, TP2, TP3, TP4, TP5, TP6 |
| 3 | 100K 0,1% | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R5, R33, R34 |
| 3 | 100n | Capacitor_SMD:C_0603_1608Metric | C1, C4, C5 |
| 3 | 1n | Capacitor_SMD:C_0603_1608Metric | C2, C3, C6 |
| 3 | 3K3 0,1% | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R3, R11, R22 |
| 3 | FerriteBead | Inductor_SMD:L_0402_1005Metric_Pad0.77x0.64mm_HandSolder | FB1, FB2, FB3 |
| 2 | 100n 0805 | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C22, C27 |
| 2 | 100u 35V | Capacitor_THT:CP_Radial_D8.0mm_P3.50mm | C7, C67 |
| 2 | 10R | Resistor_SMD:R_0603_1608Metric | R2, R4 |
| 2 | 1N4148 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D1, D9 |
| 2 | 1n | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C8, C9 |
| 2 | 2u2 50V | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C55, C66 |
| 2 | 330p | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C33, C44 |
| 2 | MCP6022 | Package_DIP:DIP-8_W7.62mm | U1, U2 |
| 2 | PAD | TestPoint:TestPoint_Loop_D2.50mm_Drill1.85mm | TP7, TP8 |
| 2 | Pad | Connector_Wire:SolderWire-1.5sqmm_1x01_D1.7mm_OD3.9mm | J3, J4 |
| 2 | STPS2H100 | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D2, D3 |
| 2 | TL431 | Package_TO_SOT_THT:TO-92 | U3, U5 |
| 1 | 100K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R38 |
| 1 | 10n | Capacitor_SMD:C_0603_1608Metric | C10 |
| 1 | 10p 0805 | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C11 |
| 1 | 1K | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R7 |
| 1 | 1m Sxant | Resistor_SMD:R_2512_6332Metric | R12 |
| 1 | 1n 100V | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C52 |
| 1 | 2 pin | SamacSys_Parts:SHDR2W125P0X396_1X2_620X890X1700P | J1 |
| 1 | 250R | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R8 |
| 1 | 2_Pin | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J2 |
| 1 | 30R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R59 |
| 1 | 3k3 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R44 |
| 1 | 47k | Resistor_SMD:R_0603_1608Metric | R1 |
| 1 | 50R | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R6 |
| 1 | AMC3302QDWERQ1 | SamacSys_Parts:SOIC127P1030X265-16N | IC1 |
| 1 | GVS logo | footprints:gvslogo_mali_Cu | H1 |
| 1 | GVS logo | footprints:gvslogo_mali | H2 |
| 1 | LM78L05 | Package_TO_SOT_THT:TO-92_Inline | U4 |

STWuRCA-diy/DUMMYLOAD_V2
Open-source electronic dummy load for testing high-voltage linear power supplies (tube amplifier PSUs). Adjustable current load, measurement and protection. Includes PCB, firmware and enclosure.





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62 parts, built around the MCP6022-I/P, AMC3302QDWERQ1, TL431 and LM78L05. 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 ZivojinV/AMC3302 repository on GitHub, at the commit this page was made from: the board is pcb/RP_AMC3302_Zu.kicad_pcb and its schematic schematic/RP_AMC3302_Zu.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 ZivojinV before reusing the design.