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Yes, it's valid. The circuit theory rules here are: Two different ideal voltage sources may not be connected in parallel (across the same pair of nodes). Two different ideal current sources may not …

As Bitsmack says, you need a power supply that can produce the same voltage and at least as much current. The most reliable way to get one is to buy an old Sega AC adapter off of eBay. Sega Retro has …

With standard spec-compliant USB, no. The device must detect the 5V from the host before it's allowed to connect its pull-up resistor to the data lines. If you're building a custom device you can prob …

First, and most important, this circuit is not safe. A mistake putting it together can kill you or someone else. Do not use it for anything. It definitely will not work well at 2 amps. Zener diode re …

Looks like a variant of a flyback converter based around a center-tapped transformer. (Here's an example from another site.) Some things that identify it as a flyback are: The switch is connected di …

A 39000uF cap and a transformer winding is way too much for a filter. I suspect your power supply is either defective, poorly-designed, or being operated way out of spec. The spikes are happening at …

I'm assuming this is for a personal project. If this is for work, listen to the others and just use a wall wart. A wall wart is a good idea for personal projects too, unless you really want an AC inle …

If you're looking for an in-depth/academic approach to learning about the theory behind switching power supplies, the power electronics class on Coursera is a good place to start. You'd probably only …

Efficiency isn't a property of the converter IC alone. It's a function of the inductor copper losses (resistance), the forward voltage drop and reverse recovery charge of the diode, the switching time …

As DoxyLover pointed out, it's not just a matter of "getting hot". The efficiency of a linear regulator is Vout / Vin, which is really bad when there's a large difference between input and output. Co …

If you draw the AC equivalents right and leave off most of the biasing, CC and CE amplifiers look almost identical. (Remember, ideally no current flows through the signal source!) simulate this …

There are reasonably priced op amps that allow 90V between the supplies (example). There are also ridiculously expensive power op amps that can handle hundreds of volts (example). But lower voltage op …

You didn't say what the power supply will be powering, i.e. what the output voltage and current are. Thus, it's not clear that a switching converter is really the best solution to your problem. A simp …

There are many different topologies for switch-mode power supplies. I think you might be getting some of the concepts mixed up. First off, in all cases that I know of, AC is converted to DC using a r …