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/sci/ - Science & Math

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9638274 No.9638274 [Reply] [Original]

oh

>> No.9638371

>titanxic

>> No.9638414

Should be using ic in place of x but this was still pretty funny good job friend

>> No.9638515
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9638515

My favorite version of this meme

>> No.9638530

>>9638515
Why? They are different circuits. Or is all of those just complex potential dividers?

>> No.9638571

>>9638530
They are all step down converters that take 240VAC in and output 5VDC. The joke is the more complex the topology the more it's for brainlets. Top is a complex offline buck converter which would have high efficiency and would be very safe. Below that a simple linear power supply using step down transformer plus linear regulator. Less efficient but perfectly acceptable. Below that is a similar supply but with an unregulated output so it can vary from the nominal 5V output. Below that is a linear supply with step down transformer but the full-wave rectifier has been replaced with a half-wave rectifier, there is no filter cap so you'll only get pulsed DC out, and on top of that it's unregulated; you'll never get 5VDC but you may at least get 5Vrms if you get the turns ratio exactly right. Bottom is a simple half-wave rectifier with resisitive divider. Terrible circuit. Unregulated. High power dissipation. No isolation, unsafe. Relatively high output impedance (determined by exact resistor values) when a good voltage source should have a very low (ideally zero) output impedance to prevent loading effects. It's bad. An awful circuit. Never make it.