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  1. J

    Audio Feedback cancellation

    I designed an electret microphone (single ended) amplifier (recommended by the chip itself) which works well, only if the speaker is very far to the source. The reason is that audio feedback is worse when mic and speaker is close to each other. The attached design below is an input to the codec...
  2. J


    Everyone, Do you have a GPS engine Module with UART interface? Please attached a datasheet or a link. I tried to check out SAMSUNG'S GPM13B03-005 but the reference schematic/ application circuit is not clear I had difficulty reading the values of capacitors.. Thanks Jeff
  3. J

    Reading Voltage FROM a current meter

    Guys, I'd like to convert a variable current from 0~5A (From Generator source which will be AC) and convert it to analog voltage from 0~5Vdc.. Can you help paste a reference schematic or explain how to design as such.. I tried using OP-AMP but it burns after I get the current and convert it...
  4. J

    220VAC output varying from 0~220VAC

    Guys, I need a circuit same as Lamp Dimmer... I need to control the RMS of 220VAC to have the voltages range around 0~220Vac using potentiometer as my controller.. I had some idea using SCR or TRIAC but not sure if it would hold around 220VAC. Please paste a link or a circuit..
  5. J

    LED counter using 1 switch with 64 LED one after the other.

    Guys I have a situtation here: Push button switch no.1 will switch on the 64 LEDS one after the other by pressing the same switch no.1 as many times as are necessarily until all the 64 LEDS are steadily lighted. What chip/counter will I use for this design? Give me idea thanks.
  6. J

    1.5ms power on delay - help needed

    1.5ms power on delay I need a ckt that has this condition "CPU_+1.2V should supply 1.5ms earlier than CPU_+3.3V" If I have 3.3V from power supply and during Power ON I need to delay it with 1.5ms to supply to CPU as CPU_+3.3V as a requirement of CPU POWER MANAGEMENT. I was looking for an IC...
  7. J

    Electronic Control Unit also known as PCM

    I got my car soaked in flood, If you heard the news in the Philippines... One important thing my HONDA CIVIC LXI 99 model is running is by the use of ECU (Electronic Control Unit) or also known as PCM (Power-train Control Module). The model of ECU I have is "37820-P2C-Y01" if anyone here have...
  8. J

    Do you have a TV tuner that has multiple channels.?

    TV tuner Do you have a TV tuner that has multiple channels.?
  9. J

    Unique Identifier chip

    i2c unique id Can someone help me to suggest an IC with an I2C or SPI interface that has a Unique Identifier that I can embed in my design?.. The chip itself will give the Unique address ..
  10. J

    Need a reference design for signal jammer

    SIGNAL jammer has anyone here has a reference design for signal jammer?>>??>
  11. J

    standalone DVR, using LINUX problem - No HDD

    No HDD I design a standalone DVR, using LINUX as an OS but it seems that there are particular Hard drive (i.e. SATA 80 G Seagate) that wasn't detected or what is seen in the screen is "NO HDD". My power supply is 12V/2A , 5V/3A.... Is there any effect with the power supply with this type of...
  12. J

    Cutoff frequency and Sampling Frequency

    sampling frequency What is the difference of Cutoff Frequency and Sampling Frequency when it comes to sensor Input?
  13. J

    Warcraft3 in Virtual Box via Ubuntu

    warcraft3 vbox has anyone tried to run Warcraft3 in virtual box via Ubuntu? Or anyone know how?
  14. J

    Hardware Design Engineer -country with high opportuinities?

    Hardware Design Engineer Im currently a hardware engineer here in the Philippines I design the schematic diagram of CPU based DVR. and last time I checked there are only few companies here in my country who has knowledge on my experience. you can count on your left hand. If you may suggest...
  15. J

    Converting ORCAD schematic to PCAD schematic

    dns capture orcad viewer Can you give me idea on how to convert ORCAD to PCAD , I know DXF but is there anyway I could convert it also including schematic and NET LISTs Im a Hardware design Engineer at NEUGENT technologies (www.neugent.net) I design schematic in ORCAD because it is easier but I...

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