2 layers85.5 × 58.8 mm
Esp32 analog
wezelball/crt_esp
A hardware and software build of a CRT controlled by an ESP32
27 partsMIT
4 layers115.5 × 78 mm
Deflection controller
wezelball/crt_espA hardware and software build of a CRT controlled by an ESP32
- Size
- 115.5 × 78 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 35
- Nets
- 60
- Pads
- 139
- Tracks, vias
- 181, 12
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 4 Oct 2026
- Updated
- 5 Oct 2026
Overview
Deflection controller is an open-source printed circuit board by wezelball, from the wezelball/crt_esp repository on GitHub, published under the MIT licence. It is a 4-layer board of 115.5 × 78 mm with 35 parts on 60 nets, routed with 181 tracks and 12 vias.
It is built around the TL082, MCP4822-E/P and L7805, with the SS14 among its other parts. Its parts include 11 capacitors, 8 resistors, 5 ICs, 2 connectors and 1 diode. It belongs with the ESP32 boards of this library.
Main components
4
TL082
SOP-8-18V~18V 0℃~+70℃ 1.4mA 1.5nA 13V/us 2 2.5nA 36V 3MHz 3mV 85dB Short-Circuit Protection SOP-8 FET Input Amplifiers ROHSGcoreOperational Amplifier
MCP4822-E/P
PDIP-8-40℃~+125℃ 12 12LSB 2 2.7V~5.5V 20MHz 4.5us 415uA 50ppm/℃ Built-in Built-in SPI Voltage Buffer PDIP-8 Digital to Analog Converters (DAC) ROHSMicrochip TechnologyDigital To Analog Converters (DAC)
L7805
TO-220ST0℃~+125℃@(Tj) 1 1.2A 20V 2V@(1A) 42uV 500uA 5V 73dB@(120Hz) Fixed Positive Short Circuit Protection TO-220ST Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSOSENVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
SS14
SMA(DO-214AC)-55℃~+150℃ 1A 25A 300uA@40V 40V 550mV@1A Independent SMA(DO-214AC) Schottky Diodes ROHSMDDSchottky Diodes
README
hardware/kicad/esp32_digital/README.mdDigital board — esp32_digital
KiCad project for the digital board: MCU, power regulation, and the SPI/control link out to the analog board.
- MCU decision (per
docs/journal/build_notes.tex, 2026-03-02): ESP32- S3-DevKitC-1, internal antenna for the prototype wooden enclosure, switching to external antenna for the eventual metal enclosure. Check this againstdocs/datasheets/, which currently holds ESP32-S2 documentation — confirm which module the schematic actually targets before finishing routing. due_level_shifter_*files are leftovers from the earlier Arduino Due shield approach (see journal, "Arduino Due" section) — the project since moved to a standalone ESP32 board rather than a Due shield. Keep for reference/history but they're not part of the current design.
Interface to the analog board
Document the connector pinout here once finalized (SPI clock/MOSI, CS, LDAC, plus power).
Status
In progress — see docs/journal/ for current bring-up notes.
Parts
35| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 10K | Resistor_SMD:R_0805_2012Metric | R1, R2, R3, R4, R5, R6, R7, R8 |
| 7 | 0.1uF | Capacitor_SMD:C_0805_2012Metric | C4, C5, C6, C7, C8, C9, C11 |
| 4 | MountingHole | MountingHole:MountingHole_2.7mm_M2.5 | H1, H2, H3, H4 |
| 2 | 10K | Potentiometer_THT:Potentiometer_Bourns_3266Y_Vertical | RV1, RV2 |
| 2 | 50K | Potentiometer_THT:Potentiometer_Bourns_3266Y_Vertical | RV3, RV4 |
| 2 | Screw_Terminal_01x04 | lib_fp_gk:TerminalBlock_Phoenix_MKDSN-1,5-4_1x04_P5.00mm_Horizontal | J1, J4 |
| 2 | TL082 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U3, U4 |
| 1 | 0.33uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1 |
| 1 | 1000uF | Capacitor_SMD:CP_Elec_10x12.5 | C2 |
| 1 | 10uF | Capacitor_Tantalum_SMD:CP_EIA-3528-21_Kemet-B_Pad1.50x2.35mm_HandSolder | C10 |
| 1 | 470uF | Capacitor_SMD:CP_Elec_10x7.7 | C3 |
| 1 | ESP32-S2-DEVKITC-1-N8R2_gk | lib_fp_gk:ESP32-S3-DevKitC | U2 |
| 1 | L7805 | Package_TO_SOT_SMD:TO-252-2 | U1 |
| 1 | MCP4822 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U5 |
| 1 | SS14 | Diode_SMD:D_SMA | D1 |
Questions
How big is the Deflection controller PCB?
It measures 115.5 × 78 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Deflection controller use?
35 parts, built around the TL082, MCP4822-E/P, L7805 and SS14. 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 controller KiCad files?
From the wezelball/crt_esp repository on GitHub, at the commit this page was made from: the board is hardware/kicad/deflection_controller/deflection_controller.kicad_pcb and its schematic hardware/kicad/deflection_controller/dac.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Deflection controller design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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