2 layers177.8 × 114.3 mm
Psu
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.
66 parts
2 layers177.8 × 101.6 mm
Deflection amp
eshazen/scope-clockIt 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 × 101.6 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 44
- Nets
- 26
- Pads
- 114
- Tracks, vias
- 234, 1
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 9 Dec 2022
- Updated
- 28 Feb 2024
Overview
Deflection amp 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 × 101.6 mm with 44 parts on 26 nets, routed with 234 tracks and 1 via.
Its parts include 22 resistors, 9 capacitors, 4 connectors and 3 ICs. It belongs with the audio and music boards of this library.
README
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
44| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 10k 5W | Resistor_THT:R_Axial_DIN0617_L17.0mm_D6.0mm_P25.40mm_Horizontal | R5, R6, R11, R12, R15, R16 |
| 6 | 1M 1/2W | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R1, R2, R7, R9, R19, R21 |
| 4 | 10k 1/2W | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R8, R10, R20, R22 |
| 4 | MTG | MountingHole:MountingHole_4.5mm_Pad | H1, H2, H3, H4 |
| 3 | 6SN7 | Octal_Sockets:AES-P-ST8-193 | U1, U2, U3 |
| 2 | 0.025uF | HV_Ceramic_Cap:Cap-Disc-D7.4-P6.4 | C3, C4 |
| 2 | 0.1uF | Capacitor_THT:C_Disc_D3.8mm_W2.6mm_P2.50mm | C9, C10 |
| 2 | 1.8k | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R13, R14 |
| 2 | 120k 2W | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R17, R18 |
| 2 | 2.2uF 250V | Capacitor_THT:C_Rect_L26.5mm_W8.5mm_P22.50mm_MKS4 | C5, C6 |
| 2 | 220 1/2W | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R3, R4 |
| 2 | 220pF | Capacitor_THT:C_Disc_D8.0mm_W2.5mm_P5.00mm | C7, C8 |
| 2 | 25k | Vishay_Pot_148:Potentiometer_Vishay_148-149_Single_Horizontal | RV1, RV2 |
| 1 | 10uF 500V | Capacitor_THT:CP_Radial_D12.5mm_P5.00mm | C1 |
| 1 | Conn_01x02 | Connector_Molex:Molex_KK-396_A-41791-0002_1x02_P3.96mm_Vertical | J1 |
| 1 | Conn_01x03 | Connector_Molex:Molex_KK-396_A-41791-0003_1x03_P3.96mm_Vertical | J3 |
| 1 | Conn_01x04 | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J2 |
| 1 | Conn_01x06 | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J4 |
Questions
How big is the Deflection amp PCB?
It measures 177.8 × 101.6 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Deflection amp use?
44 parts. 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 Deflection amp KiCad files?
From the eshazen/scope-clock repository on GitHub, at the commit this page was made from: the board is hardware/deflection_amp/deflection_amp.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 Deflection amp 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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