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Therm temp 4 20 xmtr

ControlSystemIntegrators·Therm_temp_4_20_xmtr·therm_kicad/therm/therm.kicad_pcb

Therm temp 4 20 xmtr PCB layout, top view — open source board by ControlSystemIntegrators
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About the Therm temp 4 20 xmtr PCB

Therm temp 4 20 xmtr is an open source PCB design by ControlSystemIntegrators, published on GitHub under the MIT license. It is a 4-layer board measuring 50 × 50 mm, with 45 components from 24 distinct parts.

Other key parts include the LM4040DBZ-2.5, TL431DBZ and OPA333xxDBV. By type, the board carries 18 resistors, 11 capacitors, 5 transistors, 3 modules, 2 ICs and 1 connector.

It belongs with the sensors and test & measurement designs in this gallery.

From the project

Fully analog 2-wire 4-20 mA NTC thermistor temperature transmitter, built from multi-sourced parts — plus an instrumentation-theory tutorial. Default build: 20-40 C for chocolate temperature control.

A fully analog (no microcontroller) 2-wire 4–20 mA temperature transmitter built from standard, multi-sourced parts — and a worked tutorial in the instrumentation theory behind it.

1. A teaching reference. If you've ever wanted to understand how a 4–20 mA transmitter actually works — loop power, sensor excitation, linearization, zero/span calibration — this is a complete, honest, end-to-end example with the math shown and a calculator you can run. 2. A real instrument. It was designed for chocolate temperature control (the 20–40 °C tempering/working range), as a more accurate and more robust…

Main components on the Therm temp 4 20 xmtr

LM4040DBZ-2.5TL431DBZOPA333xxDBV

Therm temp 4 20 xmtr bill of materials (BOM)

45 components, 24 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
LM4040DBZ-2.5
U1
1
TL431DBZ
U2
3
OPA333xxDBV
A1, A2, A3
2
MMBT3904
Q1, Q3
1
BCP56
Q2
2
MMBT3906
Q4, Q5
1
3.5mm
J1
2
50k
RV1, RV2
1
3.5mm
TB1
1
SMAJ33A
TVS1
1
SS14
D1
6
100nF
C1, C5, C7, C9, C10, C11
2
1uF
C2, C8
1
100pF
C3
1
1nF
C4
1
10nF
C6
1
6.04k
R1
3
2.49k
R2, R7, R15
3
10k
R3, R4, R6
6
100k
R5, R9, R10, R13, R14, R18
Show 4 more
QtyPartRefs
1
2k
R8
2
249k
R11, R12
1
49.9
R16
1
432
R17

Therm temp 4 20 xmtr design files

The KiCad project lives in the ControlSystemIntegrators/Therm_temp_4_20_xmtr repository on GitHub; these links point at the commit this page was built from.

Therm temp 4 20 xmtr: common questions

How big is the Therm temp 4 20 xmtr PCB?

The Therm temp 4 20 xmtr measures 50 × 50 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Therm temp 4 20 xmtr?

45 components, from 24 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 Therm temp 4 20 xmtr design files?

From the ControlSystemIntegrators/Therm_temp_4_20_xmtr 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 Therm temp 4 20 xmtr design in my own project?

Yes, under the terms of its MIT license, which ControlSystemIntegrators chose for the repository.

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