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Recent content by ahmed osama

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    wireless current transformer wifi + modbus

    dear all i was searching for a wireless current transformer which use the wifi and support modbus protocol to be connected to scada i failed to find something like that ?? all what i found are using non standard protocol any one can help??
  2. A

    how LCD current rating is 1.5amp???

    i have a 19 wide lenovo PC LCD written in it a current rating 1.5 amp (1.5*220 * 0.7 = 230 watt) and datasheet saying the max. power is 23 watt how that ?? thanks bye
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    how it worked ?? RF signal in salty water ??

    dears someone told me that no RF signal under the sea water since it is salty , is it true ?? so how submarine communicates and how it receives GPS signal
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    what software used here??

  5. A

    dc supply with transfomer in the output !!!!

    transfomer always be in the input stage working with the AC but not in the output with the DC !!!
  6. A

    dc supply with transfomer in the output !!!!

    dear sirs i opened a LED SPOT and i found its driver board takes 220V ac 50hz and supply the led using about 16Vd + 2 rms AC !! i the board consist of a bridge + 4.7uF 400V Cap in its input and there is some resistors , a diode (may be zener) , transistor , ... then a big surprise a small...
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    failed to read DS1302 using pic 18f4550

    i succeed to set time/date @ DS1302 but i failed to read time/date Read1302( ) return noting ... zero !!! i tried many things any tips ??? unsigned char DS1302OutputByte(void) { unsigned char i; unsigned char ACC =0; DS1302_IO_DIR =1; //input //...
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    who could explain such CISCO IP PHONE HACK !!!

    Dear all does anyone can explain in a simple way how such hack is done ?? kindly check the URL https://spectrum.ieee.org/computing/embedded-systems/cisco-ip-phones-vulnerable
  9. A

    understanding PCB transformer specs right???

    dear all do i understand the following specs for a PCB transformer right ???? the output power = 3.2VA * 0.6 (efficiency ) = 1.92 VA so max output current = 1.92 / 6Vac = 0.32 A ac thanks all
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    ac decoupling from pic 18f ADC

    when i touch the gnd by left hand and ADC i/p by my right hand i also got a complete square signal 5Vp with 50Hz
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    ac decoupling from pic 18f ADC

    dear all i have a pic 18f4550 , i am using its ADC + max232 and reading the data using rs232 in my pc i am using 9volt battery then 7805 Reg as Vdd supply my problem when the adc i/p is floating , i get an AC signal 50Hz about 2.5 Vp and when i touch the input i got a complete square signal...
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    how to calc. the period/freq. from array

    how to calc. the period/freq. from array i have an array of samples taken for square wave and i need to calc the period from this array any tips?
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    Need DC Motor specs for simulation

    how can i get or estimate the following specs for the listed below motor : 1- coil resistance 2- coil inductance (is it DC motor so it is zero) ?? 3- zero load RPM 4- load / max torque % 5- effective mass **broken link removed** EG-530AD-6B Model No.: EG-530AD-6B Rotation: CCW...
  14. A

    how much Photo Resist PCB needs UV mcd?? ( FOR UV BOX)

    dear all how much Photo Resist PCB needs UV mcd?? ( FOR UV BOX) how much mcd for each cm2 i in my country ,i don't have except 100 mcd !!
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    FOR CHINA & EGYP - how it costs this PCB as a protoype (double / single)

    dear all i want to know how much it costs the following prototype PCB , count one PCB i need to know the cost for the double & the single including cnc-drilling-green mask nothing else including also shipment to cairo - egypt thanks all
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