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Recent content by dpj

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    Fault Detection Device.

    Building a fault detection device. Once fault is detected device should not resume to normal working condition until and unless POWER is switch off for 30 Seconds. If power is restored before 30 seconds ( after switching OFF ) it again goes in Fault state. Device do not contain any battery...
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    Blocking Negative voltages to ADC

    Hey Tehmid, Thanks for the reply. I am sorry for the little vague description. Actually my signal span is -3.3V to 0 +3.3V Dc which is expected to follow PWM of 20kHz. I want to block negative part of the same and intend to use Schottky Diodes ( A ADC Pin and Ground ) for the same as at very...
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    Blocking Negative voltages to ADC

    Hi.. One of the signal which is ( -3.3V to 0 ) need to clamp to level of 0V. I can do that using the level shifter by using a voltage divider pulled up to Vref; but need to implement some other technique. Basically I want to block (-3.3V to 0 ) range to ADC and allowing only ( 0 to +3.3VDC)...
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    [Moved]facing problem in choosing low cost led display

    Re: facing problem in choosing low cost led display See there are plenty available but depend on application. You can go through this..( only for low cost option..) **broken link removed**
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    flyback smps transformer design

    Kindly study this. www.fairchildsemi.com/an/AN/AN-4140.pdf I am interested in task. State the your output requirements and available input.
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    need help identifying lcd module on circuit board

    LCDs are recognised by the segments they glow. If you want to find a similar LCD you need to have segment this LCD used to glow. All segments. This you can draw by hand also, just try to remember where which 7 segment / idetifiers / icons used to glow?? If you can post that someone can...
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    enquiry on the double switch

    If you are talking about one device controlled by two different switches following link will clear your doubt. **broken link removed**
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    Health of the Battery

    study below datasheet. This will give you fair idea how level of charge in the battery is find out. www.ic72.com/pdf/download.html?id=22852
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    How to detect presence/absence of mains (220-240VAC) current ?

    1. To sense presence of current you can look at the hall effect sensors. But it will be a mechanical challenge to create a air gap and insert a small PCB along with sensor inside. + if you have specific current cut off to sense it will be difficult in mass production. 2. Shunts are not...

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