General > General Technical Chat
Review: Hantek DDS 3X25. Anyone own one?
marmad:
--- Quote ---good to hear from you Mark. i thought you'ar dead
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The reports of my death are greatly exaggerated. ;)
--- Quote ---the fpga name has been scratched out, so we dont know what fpga it is, damned Hantek!
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I thought we had identified all of the scrubbed chips in the 3x25. You had figured out the DAC chip, and Tinhead identified the the USB chip as STM32F102Cx or STM32F103Cx - and the FPGA as a Spartan3 AN (way back in an early page of this thread). He guessed they had used the AN because it had integrated flash to stop clone makers. So it's highly likely that the FW is locked and not readable - but as far as I know, no one has tested this theory.
Mechatrommer:
iirc, the identification of the chips is just speculation, no hard proof. even if they are known, as you said, its highly probably unreadable. so maybe later, when i permanently brick the 3x25, but hopefully not.
saturation:
When I work with my equipment doing designs I isolate the outputs of my signal sources with op amps configured as voltage followers; so if anything snafus they'll be the first to take the error and easily replaced, particularly if the operating voltage of your DUT is greater than that provided by the signal source. For prototyping, I still use the 741 and work at low frequencies and a 741 is durable, it takes quite a bit of beating to kill it. Once the basic idea is sound and you are ready to test at higher frequencies, change the voltage follower to one with the needed bandwidth.
--- Quote from: Mechatrommer on March 04, 2012, 08:35:52 pm ---update:
1) my 3x25 went wacky this night. it happened when i screwed (burnt) some opamp circuit, probably some kickback making the fpga (i believe) intermittently hanging more than before. opened up, resolder everything, now better, but still happening sometime. morale, fondle your 3x25. any idea how to protect the opamp/fpga output from things like esd and spikes? any idea on how to download, save or upload and refresh the fpga FW?
2) latest SW version 3.2.1.9 available http://www.hantek.com/Product/DDS-3x25/DDS3X25USB(3.2.1.9).rar, for who want to try, i wont bother to download (i owned ver 3.2.1.7) but would love to hear if any major changes.
edit: forgot to tell, i disabled the "set wave on device startup". enabling it making thing worst, ie the unit will hang even if we disconnect and reconnect it to usb, even several time.
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Mechatrommer:
i have the 10x25 remember? but i hate to rig it out and ext psu. i think if the 3x25 frontend opamp is damaged i have one replacement opamp ready for service. and i'm not sure with follower buffer will isolate the unit fully. yes i agree with you about the 741. i'm now rigging up "fully isolated KV approved" relaxation 741 oscillator that doesnt need the 3x25 to power up :P but only for low freq (<100KHz)
T4P:
--- Quote from: saturation on March 06, 2012, 02:16:05 pm ---When I work with my equipment doing designs I isolate the outputs of my signal sources with op amps configured as voltage followers; so if anything snafus they'll be the first to take the error and easily replaced, particularly if the operating voltage of your DUT is greater than that provided by the signal source. For prototyping, I still use the 741 and work at low frequencies and a 741 is durable, it takes quite a bit of beating to kill it. Once the basic idea is sound and you are ready to test at higher frequencies, change the voltage follower to one with the needed bandwidth.
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You would wonder , because i did kill a 741 before . Or did i ?
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