Curve Tracer with Raspberry Pico
Built a compact curve tracer with the Raspberry Pi Pico, touchscreen, and a custom power board — supports BJTs, diodes, JFETs, and MOSFETs. Almost done tweaking the UI!
Here’s a preview of the curve tracer based on the RP2040. It works with an ILI9341 TFT SPI display, including touch support.
Alongside the Rapid_Development board for the Pico, it uses a constant current source built with the HC595, and a new Power Board for driving UCE.
The system runs on 12V, powered by a single 18650 Li-ion cell. The Power Board features a 12-bit ADC (MCP3204), a dual-channel DAC (MCP4822), and a power amplifier (TCA0372).
It supports measurements of standard bipolar transistors (NPN/PNP), diodes (including Zeners < 12V), JFETs, and MOSFETs.
The hardware is nearly complete — next steps are testing the software and the touchscreen interface.
The Schematic Diagram:
The Schematic Diagram:
Some fields are also changeable with 2 rotary encoders.
In the next days I will present the new Power-Board for changing Uce with Dual-Dac.
Now I have changed the current-source to 4 bit.
You can change now the base-current from 0 to 150 µA with stepwide 10 µA,
from 0 to 300 µA with stepwide 20µA
and from 0 to 750 µA with stepwide 50 µA.
Discussie (2 opmerking(en))
mausi_mick 3 dagen geleden
Now I'll change the constant-currents-source realized with HC595 to the more flexible current-source with DAC MCP4725 because it's a lot of work to change the yet realized source code (special menu part) and the DAC-version with MSP4725 has more features.
S.I ,Elektor 4 dagen geleden
Interesting project. Can you kindly also share the Python script for the Pico? Moreover, please share the snaps of this in action; it feels like many people will be interested in taking a look at it.
All best,
S.I
jarede2000 3 dagen geleden