Dual pwr
About the Dual pwr PCB
Dual pwr is an open source PCB design by sjm42, published on GitHub under the Apache-2.0 license. It is a 2-layer board measuring 50 × 50 mm, with 19 components from 17 distinct parts.
Other key parts include the TLE2426XD. By type, the board carries 4 capacitors, 4 resistors, 3 transistors, 3 diodes, 2 connectors and 1 IC.
From the project
Various electronics projects
I got this inspiration from the book 1001 Circuits by Elektor. The circuit is titled Turning your Bench Supply into a Dual Supply.
I added a fuse, a few diodes for protection and a trimmer for fine adjustment of the "ground" level.
Practically any dual opamp should work well, for example LM358, TL072 or any else with a compatible pinout. Just select one with a large enough supply voltage range. Since this circuit is basically a voltage follower (gain=1) for DC, equipped with bypass capacitors for transients, we just don't need high bandwidth, low offsets, high slew rate or any fancy…
Main components on the Dual pwr
Dual pwr bill of materials (BOM)
19 components, 17 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | TLE2426XD NE5532 | DIP-8_W7.62mm_Socket | U1 |
| 1 | 2N3904 | TO-92_Molded_Narrow | Q1 |
| 1 | TIP122 | TO-220-3_Vertical | Q2 |
| 1 | TIP127 | TO-220-3_Vertical | Q3 |
| 1 | Screw_Terminal_01x02 | pt_1,5-2-3,5-h | J1 |
| 1 | Screw_Terminal_01x03 | pt_1,5-3-3,5-h | J2 |
| 1 | T2A | Fuseholder5x20_horiz_open_universal_Type-III | F1 |
| 1 | 2k | Potentiometer_Trimmer_Vishay_T73XW_Vertical | RV1 |
| 1 | SS310 2N4007 | D_DO-41_SOD81_P10.16mm_Horizontal | D1 |
| 1 | 2N4007 | D_DO-41_SOD81_P10.16mm_Horizontal | D2 |
| 1 | 1N5822 | D_DO-27_P15.24mm_Horizontal | D3 |
| 2 | 1000u 25V | CP_Radial_D10.0mm_P5.00mm | C1, C2 |
| 2 | 1u 50V | C_Disc_D5.0mm_W2.5mm_P5.00mm | C3, C4 |
| 1 | 3.3K 10k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1 |
| 1 | 3.3K 9k1 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2 |
| 1 | 470k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R3 |
| 1 | 2k2 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R4 |
Dual pwr design files
The KiCad project lives in the sjm42/electronics repository on GitHub; these links point at the commit this page was built from.
Dual pwr: common questions
How big is the Dual pwr PCB?
The Dual pwr measures 50 × 50 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Dual pwr?
19 components, from 17 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 Dual pwr design files?
From the sjm42/electronics 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 Dual pwr design in my own project?
Yes, under the terms of its Apache-2.0 license, which sjm42 chose for the repository.
