2 layers57.5 × 42.8 mm
Black Body Heater Control
DylanLockyer/Black_Body
Electrical system for black body MKID tester
52 parts1MIT
6 layers62 × 77 mm
Black Body Temperature Sensor PCB
DylanLockyer/Black_Body1Electrical system for black body MKID tester
- Size
- 62 × 77 mm
- Copper layers
- 6
- Thickness
- 1.56 mm
- Parts
- 217
- Nets
- 196
- Pads
- 763
- Tracks, vias
- 1,491, 724
- Pours
- 34
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 11 May 2026
- Updated
- 24 Sep 2026
Overview
Black Body Temperature Sensor PCB is an open-source printed circuit board by DylanLockyer, from the DylanLockyer/Black_Body repository on GitHub, published under the MIT licence. It is a 6-layer board of 62 × 77 mm with 217 parts on 196 nets, routed with 1,491 tracks and 724 vias.
It is built around the STM32G431RBT6, LT1008S8#PBF and OPA376AIDBVR-MS, with the AD8421ARZ, LM334M and ABM8G-25.000MHZ-18-D2Y-T among its other parts. Its parts include 98 capacitors, 70 resistors, 20 ICs, 9 connectors and 6 transistors. It belongs with the sensors and measurement boards and the STM32 boards of this library.
Main components
12
STM32G431RBT6
LQFP-64(10x10)-40℃~+85℃ 1.71V~3.6V 128KB 12bit 12bit 170MHz 32 Bit 32KB 52 ARM Cortex-M4F Built-in FLASH LQFP-64(10x10) Microcontrollers (MCU/MPU/SOC) ROHSSTMicroelectronicsMicrocontrollers (MCU/MPU/SOC)
LT1008S8#PBF
SOIC-8SOIC-8 Precision Op Amps ROHSAnalog DevicesLow Noise Amplifiers (LNA) - RF
OPA376AIDBVR-MS
SOT-23-5-2.75V~-1V、1V~2.75V -25℃~+125℃ 1 130dB 2V~5.5V 2uV 30mA 30nV/℃ 500pA 50pA 5V/us 600uA 6MHz 6nV/√Hz@1kHz Rail-to-Rail Input, Rail-to-Rail Output Reverse-phase input protection SOT-23-5 Precision Op Amps ROHSMSKSEMIOperational AmplifierAD8421ARZ
SOIC-8-18V~-2.5V、2.5V~18V -40℃~+85℃ 0.02% 1 10MHz 1V/V~10000V/V 1nA 1pA/℃ 2.3mA 2nA 3.2nV/√Hz@1kHz 35V/us 400nV/℃ 5V~36V 60uV 65mA 700ns 86dB 90dB External resistor gain、Overvoltage protection、Integrated ADC driver SOIC-8 Instrumentation Amplifiers ROHSAnalog DevicesInstrumentation OpAmpsLM334M
SOIC-80℃~+70℃ 10mA 1V~40V Current Source Programmable output current ±6% SOIC-8 Current Source / Constant Current Source ROHSTexas InstrumentsCurrent Source / Constant Current Source
ABM8G-25.000MHZ-18-D2Y-T
SMD3225-4P-40℃~+85℃ 18pF 25MHz 60Ω Crystal Oscillator ±20ppm ±30ppm SMD3225-4P Crystals ROHSAbraconCrystals
AMS1117-3.3
SOT-223-40℃~+125℃ 0.003%Vout 1 1.1V@(800mA) 15V 1A 3.3V 5mA 72dB@(120Hz) Fixed Over Current Protection、Short Circuit Protection、Thermal shutdown Positive SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSAdvanced Monolithic SystemsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
ISO7762FDBQ
SSOP-16-150mil-55℃~+125℃ 100Mbps 100kV/us 11ns 2 2.25V~5.5V 2.25V~5.5V 3000 4 6 Fail-safe output、Channel direction configurable Low Level SSOP-16-150mil Digital Isolators ROHSTexas InstrumentsDigital Isolators
LT3042EMSE#TRPBF
MSOP-10-EP-40℃~+125℃@(Tj) 0.8uVrms 0V~15V 1 200mA 20V 2mA 350mV 79dB@(1MHz) Adjustable PG Pin、Over Current Protection、Over Temperature Protection、Reverse connection protection Positive MSOP-10-EP Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSAnalog DevicesVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
LT3094EMSE#TRPBF
MSOP-12-EP-40℃~+125℃@(Tj) 0.8uVrms 0V~19.5V 1 108dB@(120Hz) 12mA 20V 235mV@(500mA) 500mA Adjustable Negative Under Voltage Lockout、PG Pin、Over Current Protection、Over Temperature Protection、Enable、Short Circuit Protection MSOP-12-EP Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSAnalog DevicesVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
LTC3260EMSE#TRPBF
MSOP-16-EP-40℃~+125℃ 100mA 200uA 32Ω 4.5V~32V 500kHz Inverted Support MSOP-16-EP Charge Pumps ROHSAnalog DevicesCharge Pumps
TXU0304PW
TSSOP-14-40℃~+125℃ 1 1.08V~5.5V 1.08V~5.5V 200Mbps 4 Level translator Power-off protection、Output enable high-impedance、Integrated pull-up resistor Tri-State Unidirectional TSSOP-14 Translators, Level Shifters ROHSTexas InstrumentsTranslators, Level Shifters
README
Circuit Boards/Black_Body_Heater_Control_PCB/README.mdBlack Body Heater Control PCB
Two-layer circuit board carrying the ESP32 microcontroller and all heater control electronics: current source, voltage/current sensing, and power supply. See the firmware README for how this board is driven, and the root README for overall project context.
Schematic: Black_Body_Heater_Control_Schematic.pdf
Microcontroller
An ESP32 was chosen for its high pin count and WiFi support, letting it self-host a web page for displaying readings and controlling the heater. It interfaces with the temperature sensor board over SPI (3 CS lines for 3 temperature probes). The microcontroller is programmed over USB, with exposed pads for UART programming as a fallback. Board-to-board interfacing uses Molex connectors (504050-0891 for the SPI link) since they could be sampled for free.
Heater Controller
The heater is 4x 10Ω resistors in series (40Ω total). A maximum output power of 10W requires a peak 12V at 0.3A, measured with a shunt resistor + amplifier (current) and a voltage divider (voltage), both read by the ESP32's internal 12-bit ADC. This gives a theoretical current step of 100µA (max 0.66A range) and a voltage step of 8mV (max 36V range).
The original design used an N-channel MOSFET with PWM to control heater voltage. Due to concerns about PWM noise interfering with the sensor board's measurements, this was replaced with an analog current source instead.
Output current vs. input voltage for the analog current source. A BJT and op-amp generate the current output, driven by a DAC that the microcontroller controls.
Shunt Current Measurement
The shunt resistor is 100mΩ with a 50V/V amplifier gain, giving 2.5V output at 0.5A and 0.25V at 0.05A. A low-pass filter on the amplifier output is largely unnecessary now that PWM isn't used, but is kept (with an easy jumper to bypass it) in case it's needed. Simulated filtering of a 10% duty cycle, 10kHz PWM signal on 20V is shown below:
Power Source
The board receives 12V from an external power supply. A buck converter steps this down to 5V at 2A, followed by an LDO to 3.3V for a clean, low-noise supply to the microcontroller and ADC.
Revision 1: Changed buck converter to newer module as the rev 0 as it broke and fried both boards.
Simulation
Heater and buck converter behavior were validated in PSpice before layout (see Simulations/Heater_Controller_PCB):
Parts
217| Qty | Value | Footprint | References |
|---|---|---|---|
| 48 | 2u2 | Capacitor_SMD:C_0402_1005Metric | C201, C202, C203, C204, C205, C206, C207, C208, C209, C210, C211, C212, C213, C214, C215, C216 +32 |
| 29 | 0.1uf | Capacitor_SMD:C_0603_1608Metric | C502, C503, C504, C505, C506, C507, C508, C509, C510, C511, C512, C513, C514, C515, C516, C517 +13 |
| 26 | 5.1k | Resistor_SMD:R_0402_1005Metric | R201, R202, R203, R204, R205, R206, R207, R208, R301, R302, R303, R304, R401, R402, R403, R404 +10 |
| 8 | 10uf | Capacitor_SMD:C_0603_1608Metric | C601, C602, C606, C607, C609, C614, C615, C712 |
| 6 | 10k | Resistor_SMD:R_0603_1608Metric | R412, R413, R505, R506, R703, R704 |
| 6 | TMUX1112PWR | Package_SO:TSSOP-16_4.4x5mm_P0.65mm | Q201, Q202, Q301, Q401, Q402, Q403 |
| 6 | TestPoint | TestPoint:TestPoint_Pad_2.0x2.0mm | TP401, TP402, TP403, TP601, TP602, TP603 |
| 5 | 4.7uf | Capacitor_SMD:C_0603_1608Metric | C608, C610, C611, C612, C613 |
| 5 | OPA376xxDBV | Package_TO_SOT_SMD:SOT-23-5 | U501, U502, U503, U504, U509 |
| 4 | 180k | Resistor_SMD:R_0603_1608Metric | R602, R603, R607, R609 |
| 3 | 1.33k | Resistor_SMD:R_0603_1608Metric | R210, R211, R705 |
| 3 | 10M | Resistor_SMD:R_0603_1608Metric | R305, R502, R504 |
| 3 | 33.2k | Resistor_SMD:R_0603_1608Metric | R407, R605, R608 |
| 3 | 500 | Resistor_SMD:R_0603_1608Metric | R406, R606, R616 |
| 2 | 10nf | Capacitor_SMD:C_0603_1608Metric | C604, C605 |
| 2 | 13.3k | Resistor_SMD:R_0603_1608Metric | R212, R213 |
| 2 | 134k | Resistor_SMD:R_0603_1608Metric | R214, R215 |
| 2 | 28pf | Capacitor_SMD:C_0603_1608Metric | C703, C705 |
| 2 | 448k | Resistor_SMD:R_0603_1608Metric | R611, R613 |
| 2 | 50 | Resistor_SMD:R_0603_1608Metric | R501, R503 |
| 2 | 50k | Resistor_SMD:R_0603_1608Metric | R612, R614 |
| 2 | 569k | Resistor_SMD:R_0603_1608Metric | R601, R604 |
| 2 | AD8421ARZ | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U505, U506 |
| 2 | LM334M | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U201, U301 |
| 2 | SW_MEC_5E | -switch:430471035826 | SW701, SW702 |
| 2 | Screw_Terminal_01x02 | -connector:CUI_TB002-500-02BE | J401, J402 |
| 1 | 1.33M | Resistor_SMD:R_0603_1608Metric | R216 |
| 1 | 100M | Resistor_SMD:R_0603_1608Metric | R308 |
| 1 | 100k | Resistor_SMD:R_0603_1608Metric | R307 |
| 1 | 133 | Resistor_SMD:R_0603_1608Metric | R209 |
| 1 | 1M | Resistor_SMD:R_0603_1608Metric | R310 |
| 1 | 1N457 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D201 |
| 1 | 1N5819WS | Diode_SMD:D_SOD-323 | D701 |
| 1 | 1uf | Capacitor_SMD:C_0603_1608Metric | C603 |
| 1 | 2.7k | Resistor_SMD:R_0603_1608Metric | R311 |
| 1 | 200pf | Capacitor_SMD:C_0603_1608Metric | C309 |
| 1 | 22.6k | Resistor_SMD:R_0603_1608Metric | R306 |
| 1 | 220nf | Capacitor_SMD:C_0603_1608Metric | C501 |
| 1 | 226k | Resistor_SMD:R_0603_1608Metric | R309 |
| 1 | 22uf | Capacitor_SMD:C_0603_1608Metric | C715 |
| 1 | 4.99 | Resistor_SMD:R_0603_1608Metric | R405 |
| 1 | 436500200 | -connector:436500200 2-pin | P601 |
| 1 | 5040500891 | -connector:CONN_5040500891_MOL | J702 |
| 1 | 7.5k | Resistor_SMD:R_0603_1608Metric | R610 |
| 1 | ABM8G-25.000MHZ-18-D2Y-T | -oscillators:ABM8G-25.000MHZ-18-D2Y-T | U702 |
| 1 | ADS131M04xPW | Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm | U507 |
| 1 | AMS1117-3.3 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U705 |
| 1 | Conn_01x02_Pin | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J601 |
| 1 | Conn_01x04_Pin | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J704 |
| 1 | Conn_01x06_Pin | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J701 |
| 1 | ISO7762FDBQ | Package_SO:SSOP-16_3.9x4.9mm_P0.635mm | U508 |
| 1 | LOGO | LOGO | G*** |
| 1 | LT1004-1.2 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | D301 |
| 1 | LT1008 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U302 |
| 1 | LT3042xMSE | Package_SO:MSOP-10-1EP_3x3mm_P0.5mm_EP1.68x1.88mm | U603 |
| 1 | LT3094xMSE | Package_SO:MSOP-12-1EP_3x4.039mm_P0.65mm_EP1.651x2.845mm | U602 |
| 1 | LTC3260xMSE | Package_SO:MSOP-16-1EP_3x4.039mm_P0.5mm_EP1.651x2.845mm | U601 |
| 1 | RED | LED_SMD:LED_0603_1608Metric | D702 |
| 1 | SMAJ24A | Diode_SMD:D_SMA | D601 |
| 1 | STM32G431RBTx | Package_QFP:LQFP-64_10x10mm_P0.5mm | U704 |
| 1 | TXU0304 | Package_SO:TSSOP-14_4.4x5mm_P0.65mm | U701 |
| 1 | USBLC6-2SC6 | Package_TO_SOT_SMD:SOT-23-6 | U703 |
| 1 | USB_C_Receptacle_USB2.0_16P | -connector:UJ20-C-H-G-SMT-1-P16-TR | J703 |
| 1 | pogo programmer | -connector:pogo_programmer | P701 |
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Questions
How big is the Black Body Temperature Sensor PCB PCB?
It measures 62 × 77 mm and has 6 copper layers, 1.56 mm thick.
What parts does the Black Body Temperature Sensor PCB use?
217 parts, built around the STM32G431RBT6, LT1008S8#PBF, OPA376AIDBVR-MS and AD8421ARZ. 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 Black Body Temperature Sensor PCB KiCad files?
From the DylanLockyer/Black_Body repository on GitHub, at the commit this page was made from: the board is Circuit Boards/Black_Body_Temperature_Sensor_PCB/Black_Body_Temperature_Sensor_PCB.kicad_pcb and its schematic Circuit Boards/Black_Body_Heater_Control_PCB/Black_Body_Heater_Control.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Black Body Temperature Sensor PCB 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).