Here is ztex. I'm producing FPGA Boards, see http://www.ztex.de
. I also developed a FPGA board which is optimized for cryptographic applications like bitcoin mining: http://www.ztex.de/usb-fpga-1/usb-fpga-1.15x.e.html
Open Source Bitcoin mining software I released here: http://www.ztex.de/btcminer
. I'm writing this because scammer usually invest time in developing Open Source Software for the products.
As Gusti wrote, he returned two boards 2 days ago. Both voltage regulators on both boards where destroyed. These voltage regulators are over current and temperature protected. The only way do destroy voltage regulators is by over voltage.
Since the valid range of 4.5 to 16 V (absolute maximum: 4.5 - 18 V) is clearly stated on the products page (http://www.ztex.de/usb-fpga-1/usb-fpga-1.15x.e.html#con5
), this is not covered by warranty.
Here is an image which shows the 3.3V regulator of one of Gustis board:
IMHO Gustie used an unregulated power supply. These things are called unregulated because their real output voltage is not equal to the value on the label. Gusti, did you measured the mean/RMS voltage or the peak voltage?
The universal supplies from supermarket I mentioned (these one with switchable output voltage) are AFAIK always regulated. Therefore I recommend them as save.
Gusti, you wrote that smoke came out of one part of the first board. Why you destroyed the second board in the same way instead of asking me what is going wrong?
I believe this is a plain SCAM, so , beware from buying anything from ZTEX.
These regulator circuits are used in 4 other products. I sold a few hundreds of them. Gusti is the only customer I know who destroyed the regulators in this way.
BTW, I just counted it: I wrote Gusti 22 support mails which was not always easy. His last mail was
no problem, bro
I will make sure you will not sell a single card in the forum anymore
Total price including overseas shipping was USD 929.-, I told [redacted] I was going to pay with bitcoins, as he told me he would be accepting them. Price with bitcoins was 10% more than with USD, I was not very happy with that , but I accepted the surplus to make transaction faster.
The 10% included a volatility margin and exchange + transfer frees. In these days the bitcoin price jumped by several percent within minutes.
If you would have used Paypal you would have received the board within the same time.