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Registered Member #61406
Joined: Thu Jan 05 2017, 11:31PM
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Posts: 268
Suliman with coupling capacitor, I'm assuming you mean to block DC . I built a bridge recifer with a series capacitor, and measuring DcV got 11.58V. I think I understand what kludgesmith was saying, a square wave average to zero on AcV.
Registered Member #61406
Joined: Thu Jan 05 2017, 11:31PM
Location:
Posts: 268
Part 1: waveform switching between 0 and +12 V, alternating 15 us Low and 15 us High. DC component = average voltage = +6 V. AC component alternates between -6 V and +6 V, with middle = average = zero. If rise and fall times are negligible, the true RMS value of AC component is 6 V. (why?) The true RMS value of composite waveform, which most meters can't measure directly, is 12 V divided by sqrt(2). The heating of a hypothetical load resistor to ground would be 1/2 as much as you would get from 12 volts DC, because it's only "on" half the time.
Part 2: now the waveform switches between 0 and +12 V, but it's Low for 20 us and High for 10 us. What is the value of DC component? What are the AC component's low, high, middle, and average voltages? What's the true RMS value of AC component? What's the true RMS value of composite waveform? (This one should be easy.)
They don't use average, because it equal zero ,that why they use RMS, but as other have said might not work at that frequency. Looking at a book, a square wave, shows 2 instead of 1.41 but Ac I'm guessing is from peak to peak divide by 1.41, 'This one should be easy' isn't (:
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555 output to a Schmitt trigger.