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JYE Tech DSO150 oscilloscope troubles

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HwAoRrDk:
A lot of these cheap 1117 voltage regulators only have an absolute maximum input voltage rating of 15V. An unregulated 9V plug pack could easily exceed that under light load. For example, a random multi-output one grabbed from my shelf gives, with no load, nearly 16V on the '9V' setting and just over 20V on the '12V' setting. I have a DSO138 and the unregulated plug pack I run it off I have set to 6.5V, which actually delivers it about 8V.

It is my experience that these cheap 1117s fail with the input shorted to output when over-volted. And STM32s definitely do not appreciate 15V up the clacker. :D

NoisyBoy:
The sensitivity to over voltage is a well known issue, that’s why they have caution about keeping it at 8-10V all over the latest documentation. 

Even with a bench power supply, I would be careful with the cheap supplies due to overshoot at power on.  I know with a very low ripple linear power supply, the DSO150 actually behave quite nice. 

MrElectric:
Those parts are quite cheap. I think I paid less for them than what I have to pay for the customs and postal handling fees for a china parcel.

I actually paid a lot for these four(!) parcels already. I'd rather pay for new components than more senseless fees.

Also, I did email about the first unit, and was sent a new one from Jye Tech (without charge). But it still cost me to receive the unit.

And it's more fun to try to fix the ones I have!   :-+

MrElectric:

--- Quote from: mikerj on April 03, 2019, 12:24:39 pm ---FWIW Diodes Inc is a large and well respected American semiconductor company, they make a huge range of parts.  No need to avoid their parts (in fact I've had more issues with TI parts than Diodes Inc).

--- End quote ---

Ok. I had a look at their datasheet, and saw that their 1117 can handle 1A and up to 18V, while other manufacturers' 1117's only handle 800mA and 15V. And they only cost about a third of the TI parts. Unfortunately, I have already ordered, so I will have to do with the TI ones. :-)

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