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Hantek 2000 series - 2C42/2C72/2D42/2D72

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tinhead:
no worries Werner, Tekway, later Hantek is using these ADCs overclocked since 9 years in their products, i have such Tekway DSO since 8y already, no issues so far -> https://www.eevblog.com/forum/testgear/hantek-tekway-dso-hack-get-200mhz-bw-for-free

For sure it's not good for silicon, so can add small heatsink to it.

I have seen your pictures, next time when you open it, shot some pictures of the input circuit as well.

wpwrak:

--- Quote from: tinhead on December 25, 2018, 08:13:04 pm ---For sure it's not good for silicon, so can add small heatsink to it.

--- End quote ---

Heh, if it's really just more heat the chips are producing. Alas, we can't quite know how Analog do their binning, and what sort of IQC Hantek are performing. It's a pity the 2C42 jumps straight from 10 MHz to 100 MHz, leaving the upper end of the within-specs range unused.


--- Quote ---I have seen your pictures, next time when you open it, shot some pictures of the input circuit as well.

--- End quote ---

Still had it open from measuring the sample rate. The cans pop very easily, a reverse engineer's dream ;)

I've added the front-ends to the picture collection:
https://github.com/wpwrak/2c42-pix/blob/master/jpg/afe.jpg
https://github.com/wpwrak/2c42-pix/blob/master/jpg/afe-zoom.jpg

They may look quite dark in the previews (I didn't post-process them since I really like how crisp they came out and didn't want to lose any of that), but if you look at them at the full resolution, you should be able to identify every component. There are a few unpopulated  footprints in the AWG circuit, U13 and some 3-SOT part, so that AWG probably isn't fully functional. It does produce the reference square wave for probe compensation, though.

- Werner

tinhead:

--- Quote from: wpwrak on December 26, 2018, 03:18:48 am ---I've added the front-ends to the picture collection:
https://github.com/wpwrak/2c42-pix/blob/master/jpg/afe.jpg
https://github.com/wpwrak/2c42-pix/blob/master/jpg/afe-zoom.jpg

--- End quote ---

interesting, EL5166 as driver, so there is room for improvement. The discrete part is known from other DSOs, so one can improve it as well.
Sure, when sampling with 250MSa/s it does not make much sense to get higher than 100MHz input, but still, better that 40MHz.


--- Quote from: wpwrak on December 26, 2018, 03:18:48 am ---There are a few unpopulated  footprints in the AWG circuit, U13 and some 3-SOT part, so that AWG probably isn't fully functional. It does produce the reference square wave for probe compensation, though.

--- End quote ---

Hantek was in the past lazy, there is chance that AWG will work when you add DAC. But that's easy to check on the DAC pins.

ataradov:
I've got 2D72 today, and so far I like what I see.

But one thing is not clear - how long does it actually take to charge the battery? It arrived with batteries completely discharged (would not turn on). After multiple hours it has charged to 1 bar.

So if you have one, is it normal charging time?

EDIT: It draws 90 mA in an off, but charging state according to USB power meter. Seems low.

ataradov:
After some playing around with batteries, I've got a dead unit. Some quick troubleshooting lead to dead H&M Semi HM4052. It is a battery charger/switch power supply that is used to supply the rest of the system.

Interestingly, this IC was clearly reworked on my device, there are signs of flux all over the place (which may have been the source of poor charging).

The IC seems to be unobtainable.

So now I can transform this unit to USB-only by bypassing this IC and dropping the input voltage to 3.8 V (normal output of HM4052). Or diode-switch USB and battery voltages and skip battery charging.

Both options kind of suck. If anyone knows the source for HM4052, I'd be glad to hear.

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