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Recent content by diepvu1805

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    help in buying SIM908 ?

    Hi all, I have a client, he is live in Newdelhi, India. He have SIM908 customer board, but SIM908 died. And he want to buy some pcs. Please, suggest address where retail SIM908 to me. Thank you.
  2. D

    Convert 220VAC to 110VDC without transformer

    yes, Output is 110VDC referenced to the neutral.
  3. D

    Convert 220VAC to 110VDC without transformer

    I want to keep Output at 110V +/-5% when Input change from 160VAC - 260VAC. Voltage 220VAC is typical.
  4. D

    Convert 220VAC to 110VDC without transformer

    yes, Vout tolerance +/-5%
  5. D

    Convert 220VAC to 110VDC without transformer

    Hi all, I want to convert from 220VAC/50Hz to 110VDC without transformer. I also don't want to use the voltage divider capacitor, resistor circuitry. parametter as follow: Vin: ~220VAC/50Hz Vout: 110VDC Iout: 12 - 20mA. Non-isolated Pls, suggest the good solution to me, thank in advance,
  6. D

    Using ulink as a device programmer?

    Hi all, I saw topic "USING ULINK AS A DEVICE PROGRAMME"_ https://www.keil.com/support/docs/3061.htm. how to do this? I want to use ULINK to program HEX file to LPC2103 but don't want to open all source file by Keil C. Or Can you suggest me other flash tool software using ULINK? Thanks in advance,
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    SIM908 problem GPS antenna.

    As follow SIM908's datasheet(5.3):"If the antenna's is not 2.8V, a proper voltage be provide to the GPS-VANT-IN depending on the active antenna...". I am using the GPS antenna with voltage supply from 3 -5V, thus I connected GPS-VANT-IN pin to VBAT. The voltage GPS-VANT-IN rate didn't write in...
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    SIM908 problem GPS antenna.

    Thank all,
  9. D

    SIM908 problem GPS antenna.

    I used AT+CGPSRST=1 to reset GPS, I still receive the data from SIM908 but data errors, it's not position. I think GPS anttena not work because it hasn't power(GPS_ANT pin present 0V), but I haven't the solution to solve this problem.
  10. D

    SIM908 problem GPS antenna.

    Yes, I did. and I checked voltage present on GPS_VANT_OUT(pin75) is 2.8V. but GPS not work.
  11. D

    SIM908 problem GPS antenna.

    Hi all, I am using SIM908 to get GPS. In my design, I connect GPS-VANT-IN(pin76) with VBAT pin(i use the active antenna). Everything run well. But today, I cann't not get GPS. I used mutilmeter to check voltage on GPS-ANT(pin 79), it present 0V(in common, it present approximate VBAT). That mean...
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    Convert 220VAC to 12VDC

    Thank all, In my design, I don't want to transformer or isolator circuit, because the PCB is small. This is also difficult. I think a solution use capacitor, diodes, ...IC is good. pls, help me
  13. D

    Convert 220VAC to 12VDC

    Hi all, I want to design the simple power circuit to convert 220VAC(Vin) to 12VDC with current Consumption max 100mA. pls, suggest me the best solution. Thank,
  14. D

    Need help with multiple keying using PT2248

    Hello, Pls see page in PT2248 datasheet, https://www.princeton.com.tw/downloadprocess/downloadfile.asp?mydownload=PT2248_7.pdf
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    SIM908 problem SIMCARD

    Hi Rod_0, you can find answer here: https://www.edaboard.com/threads/242952/#post1075074.

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