Back in 2012, I was pleasantly surprised when I discovered they made Digital Storage Oscilloscope (DSO) for less than $200, and today, you can find several oscilloscopes for less than $100, albeit with limited performance, such as DS201. But if you don’t need a high speed DSO and just want to have some fun, JYE Tech DSO138 is a single channel oscilloscope DIY kit that you need to assemble yourself, and sells for just $23 on Banggood, or about $30 on Aliexpress, or Ebay.
DSO138 key specifications:
- MCU – STM32F103C8 ARM Cortex-M3 processor
- Display – 2.4 -inch color TFT display
- Analog bandwidth – 0 – 200KHz
- Sampling rate – 1Msps max
- Sensitivity – 10mV/Div – 5V/Div
- Sensitivity error – < 5%
- Vertical resolution – 12-bit
- Timebase – 10us/Div – 500s/Div
- Record length – 1024 points
- Input impedance : 1MΩ
- Maximum input voltage : 50Vpp (1:1 probe), 400Vpp (10:1 probe)
- Built-in 1KHz/3.3V test signal
- Waveform frozen (HOLD) function available
Bear in mind there are two versions of the kit: 13801K with all SMD parts pre-soldered, and 13802K with only the MCU soldered. So if you don’t feel confident soldering SMD resistors, and small ICs, make sure you get the 13801K version. The one in Banggood requires you to solder SMD parts, so you may be better off going with the one in Ebay. The User Manual in English will guide through the soldering, verification, troubleshooting, and usage steps, and once you’re done, you’ll be proud to have made an oscilloscope that looks like that.
Thanks to Onebir for the tip.