4 layers116.8 × 111.8 mm
Dac
eshazen/scope-clock
It seems I have a bunch of surplus 12V transformers in my office, so probably will use two of those to generate the +8V and -5V with bridge rectifiers.
60 parts
2 layers177.8 × 114.3 mm
It seems I have a bunch of surplus 12V transformers in my office, so probably will use two of those to generate the +8V and -5V with bridge rectifiers.
- Size
- 177.8 × 114.3 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 66
- Nets
- 48
- Pads
- 168
- Tracks, vias
- 283, 4
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 9 Dec 2022
- Updated
- 28 Feb 2024
Overview
Psu is an open-source printed circuit board by eshazen, from the eshazen/scope-clock repository on GitHub. It is a 2-layer board of 177.8 × 114.3 mm with 66 parts on 48 nets, routed with 283 tracks and 4 vias.
It is built around the PR16-12V-540-2C. Its parts include 15 capacitors, 14 connectors, 13 resistors, 13 diodes and 2 switches. It belongs with the power boards of this library.
Main components
1README
hardware/psu/README.mdPower Supply
Status
2023-02-23 Mostly working. Relay wiring incorrect (see ECOs). Otherwise all outputs verified working, at least with no load.
Rev A ECOs
- C13 should be much bigger, maybe 4700uF
- Bridge footprints are wrong (holes way too small)
- Relay wiring is incorrect
- Can't use the S4 or S6 outputs of the CW multipler, only S5, S7. Maybe add an S3 tap? In any case, fix J14 wiring.
Requirements
- AC power entry, fuse, power switch
- +8V for logic (~1A) regulator on CPU board makes 5V for DAC (Antek 6.3V winding too wimpy)
- -5V for Z axis drive (low current). Should be regulated
- 8-stage CW generator for -1500V
- Jumpers to select output voltage
- Discharge circuit for power-down
- Voltage doubler for +360V with two-stage R-C filter (200 ohm, 100uF or so)
- Switched AC out (2x?) for 12V filament transfomer plus spare
It seems I have a bunch of surplus 12V transformers in my office, so probably will use two of those to generate the +8V and -5V with bridge rectifiers.
ECOs for Rev 1
- Relay wiring wrong. Cut traces to J1 pins 1,3. Wire pin 1 to Relay pin 11 and pin 3 to relay pin 12. (leave gap in cut, ~180VAC)
- Add bleeder on 360V! (ouch!)
Parts
66| Qty | Value | Footprint | References |
|---|---|---|---|
| 10 | 1N4007 | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D1, D2, D3, D4, D5, D6, D7, D8, D9, D10 |
| 8 | 47u 400V | Capacitor_THT:CP_Radial_D12.5mm_P5.00mm | C1, C3, C5, C6, C7, C8, C9, C10 |
| 6 | 1.0M 2W | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P15.24mm_Horizontal | R6, R7, R8, R9, R10, R11 |
| 4 | 100u 400V | Capacitor_THT:CP_Radial_D22.0mm_P10.00mm_SnapIn | C2, C4, C14, C15 |
| 4 | MountingHole | MountingHole:MountingHole_4.3mm_M4 | H1, H2, H3, H4 |
| 3 | Conn_01x02 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J1, J12, J15 |
| 3 | Conn_01x03 | Connector_Molex:Molex_KK-396_A-41791-0003_1x03_P3.96mm_Vertical | J5, J8, J13 |
| 2 | 10u 25V | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | C11, C13 |
| 2 | 200 ohm 5W | Resistor_THT:R_Axial_DIN0617_L17.0mm_D6.0mm_P25.40mm_Horizontal | R4, R5 |
| 2 | Conn_01x04 | Connector_Molex:Molex_KK-254_AE-6410-04A_1x04_P2.54mm_Vertical | J9, J10 |
| 2 | D_Bridge_+-AA | Diode_THT:Diode_Bridge_19.0x3.5x10.0mm_P5.0mm | D11, D14 |
| 1 | 100 ohm 1/2W | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R1 |
| 1 | 100k | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R3 |
| 1 | 10k | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R12 |
| 1 | 120 ohm 5W | Resistor_THT:R_Axial_DIN0617_L17.0mm_D6.0mm_P25.40mm_Horizontal | R2 |
| 1 | 1u 10V | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C12 |
| 1 | 3.3K | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R13 |
| 1 | A1A | LED_THT:LED_D1.8mm_W1.8mm_H2.4mm_Horizontal_O3.81mm_Z4.9mm | NE1 |
| 1 | Conn_01x02 | Connector_Molex:Molex_KK-396_A-41791-0002_1x02_P3.96mm_Vertical | J3 |
| 1 | Conn_01x05 | Connector_Molex:Molex_KK-396_5273-05A_1x05_P3.96mm_Vertical | J14 |
| 1 | Conn_01x05 | GSP1_power_entry:GSP1.8101.1 | J2 |
| 1 | Conn_01x05 | Connector_Molex:Molex_KK-396_A-41791-0005_1x05_P3.96mm_Vertical | J6 |
| 1 | Conn_01x06 | Connector_Molex:Molex_KK-396_A-41791-0006_1x06_P3.96mm_Vertical | J4 |
| 1 | Conn_01x08 | Connector_Molex:Molex_KK-396_A-41791-0008_1x08_P3.96mm_Vertical | J7 |
| 1 | Fuse | HBH_fuse_holder:HBH-I-R | F1 |
| 1 | LED | LED_THT:LED_D3.0mm | D12 |
| 1 | LM7905_TO220 | Package_TO_SOT_THT:TO-220-3_Vertical | U1 |
| 1 | LOGO | hv_danger:hv_danger | G*** |
| 1 | NMOS | Package_TO_SOT_THT:TO-220-3_Vertical | Q1 |
| 1 | PR16-12V-540-2C | my_relay:DIP-22_W7.62mm_LongPads | K1 |
| 1 | SW_SPST | Switch_8GA:8GA1016-Z | SW1 |
Questions
How big is the Psu PCB?
It measures 177.8 × 114.3 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Psu use?
66 parts, built around the PR16-12V-540-2C. 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 Psu KiCad files?
From the eshazen/scope-clock repository on GitHub, at the commit this page was made from: the board is hardware/psu/psu.kicad_pcb and its schematic hardware/anderson_crt/anderson_crt.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Psu design in my own project?
Its repository states no licence, so its author keeps all rights: ask eshazen before reusing the design.
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