General > General Technical Chat
Review: Hantek DDS 3X25. Anyone own one?
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torch:
Isn't the replacement missing about 3 BNC connectors for $100 more? I have to confess that I kind of lost interest after that...
saturation:
mecha and you guys have certainly taken the 3x25 much farther than Hantek could have envisioned, I would suspect this is the reason its been resurrected, it shouldn't have been canceled in the first place, maybe the g in the name 1025G is for Goltek  :-+?

Checking just now this vendor sells the new version for ~ price as any new 3x25 now remaining on eBay:

http://www.circuitspecialists.com/hantek-1025g.html

The photos, description, software, specs and accessories are ~  identical to the 3x25.



--- Quote from: marmad on December 15, 2012, 09:55:13 pm ---
--- Quote from: torch on December 15, 2012, 09:46:23 pm ---I can't understand why Hantek seems to have orphaned the DDS 3X25.
--- End quote ---
Well, as mentioned in the other thread I recently started, they are producing more of them - just putting them in a slicker-looking container - and asking a lot more money for them ($231 at AliExpress).  So they are trying to cash in on the success of the DDS-3X25 - but without any real extra effort on their part.

--- End quote ---
T4P:
Think hantek wants to give it new look to match the other USB oscilloscopes but you know what? Most aliexpress sellers will probably always jack up the price
On taobao from the same seller the price delta between the 2 is about 15USD
PuterGeek:

--- Quote from: Mechatrommer on December 14, 2012, 02:20:07 am ---...freq change at zero crossing is one thing, signal sweep "flatness" is another, that can be a challenge since ds3x25 is not flat at >5MHz...

--- End quote ---

One of my many 'plans' is to mode mine with a different DC-DC switcher and a 5th order LC output filter.

The op amp they used is pretty good but they only used a +/- 5V DC-DC converter. If we changed that to a +/- 12V switcher it would have greater output, especially into a 50 ohm load. There are numerous pin compatible op-amps that could be used also.

The simple one capacitor 'filter' on the DAC output won't be anywhere close to flat. 'Real' DDS have a passive LC filter on the output that is pretty flat up to the cutoff frequency and then rolls off very steeply. A small PCB with the filter should be easy to embedded since the parts are small.

Maybe I'll whip up a schematic to share in case someone wants to try my idea. What would be a good cutoff frequency do you think I should use?
Mechatrommer:

--- Quote from: PuterGeek on December 17, 2012, 12:10:31 am ---What would be a good cutoff frequency do you think I should use?

--- End quote ---
100 or 200MHz?


--- Quote from: PuterGeek on December 17, 2012, 12:10:31 am ---Maybe I'll whip up a schematic to share in case someone wants to try my idea.

--- End quote ---
yes please do. i will be interested. ;)
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