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Electronic load

ondras12345·electronic-load·electronic-load-controller/electronic-load-controller.kicad_pcb

Electronic load PCB layout, top view — open source AVR/Arduino board by ondras12345

About the Electronic load PCB

Electronic load is an open source AVR/Arduino PCB design by ondras12345, published on GitHub under the MIT license. It is a 2-layer board measuring 48.3 × 50.8 mm, with 60 components from 29 distinct parts.

Its main chip is the ATmega8-16P, from the AVR/Arduino family. Other key parts include the H11L1 and LM7805_TO220. By type, the board carries 20 resistors, 17 capacitors, 7 connectors, 4 ICs, 4 diodes and 3 transistors.

It belongs with the displays & leds designs in this gallery.

From the project

Digital control for XHDZ-FZ-2g electronic load

This project is based on an analog electronic load PCB from Aliexpress: XHDZ-FZ-2g. Originally, I just put it in a box and used it as-is with a 10-turn potentiometer. However, then the pot failed, and I decided to upgrade it with digital control. The control loop is still analog utilising the original circuitry, but the reference signal is generated by a microcontroller instead of the potentiometer.

Electronic load, from the project README
From the project README

Main components on the Electronic load

H11L1ATmega8-16PLM7805_TO220

Electronic load bill of materials (BOM)

60 components, 29 distinct parts.

QtyPartRefs
2
H11L1
U1, U2
1
ATmega8-16P
U3
1
LM7805_TO220
U4
1
BSS84
Q1
1
BSS138
Q2
1
BCP56
Q3
1
16M-49S-SR
Y1
2
Conn_01x04
J1, J5
1
Conn_01x02
J2
1
Conn_01x05
J3
3
Conn_01x03
J4, J7, J8
2
SolderJumper_2_Bridged
JP1, JP2
1
SW_Push
SW1
1
Thermistor_NTC
TH1
2
ESD5Z5V0
D1, D6
1
BAV99
D3
1
1N4007
D5
7
100n
C1, C2, C3, C6, C14, C15, C17
2
22p
C4, C5
1
1u / 25V
C7
Show 9 more
QtyPartRefs
5
10n
C8, C9, C10, C11, C12
1
330n
C13
1
10uF
C16
4
1k
R1, R2, R5, R8
2
330
R3, R21
11
10k
R4, R6, R7, R10, R11, R13, R14, R15 +3
1
330k
R12
1
22k
R16
1
100
R17

Electronic load design files

The KiCad project lives in the ondras12345/electronic-load repository on GitHub; these links point at the commit this page was built from.

Electronic load: common questions

What microcontroller does the Electronic load use?

The Electronic load is built around the ATmega8-16P, from the AVR/Arduino family.

How big is the Electronic load PCB?

The Electronic load measures 48.3 × 50.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Electronic load?

60 components, from 29 distinct parts. The full bill of materials is listed on this page.

Where can I download the Electronic load design files?

From the ondras12345/electronic-load repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Electronic load design in my own project?

Yes, under the terms of its MIT license, which ondras12345 chose for the repository.

Can I test firmware for the Electronic load without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.

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