The frequency issue is why somebody suggested a multi-phase approach. Use several lower-frequency switchers in parallel, run them off the same clock, and stagger their switching times. If there are N sections running at frequency F, then the load will see ripple at frequency N*F. Furthermore...
How about an isolated linear section to "top off" the output?
Power it with an isolation transformer, give it a -15 to +15 V output range controlled by an optocoupler, and put it in series with the switcher output.
And give it really good transient protection.
Will there be significant inrush current into the load's decoupling capacitors? A small series resistor might be a good idea.
Will the load's minimum current be above the Zener's leakage current?
What you want is a reed relay. The contacts are two metal reeds hermetically sealed inside a glass capsule. When the coil is energized, they attract each other and complete the circuit. Models with gold-plated contacts are available. Vacuum-filled versions are available for kilovolt work...
The AC current from a wall wart is generally tiny, less than a milliamp. It will not hurt most digital chips because of their ESD diodes, but small-signal MOSFETs, laser diodes, and such may not fare so well.
Then again, it doesn't take many man-days of debugging a zapped component to pay for...
That is an idiotic policy. If somebody is stealing or hoarding equipment, you stop them. If the company wants to outfit home labs, it should do so using proper requisition, asset tagging, and sign-out procedures.
Custom-designing and hand-building hardware is a waste of money. The result...
Sealed chambers tend to make for condensation problems. If a sudden temperature change makes the electronics the coldest thing in the box, that is where the water will condense. Dessicant bags are your friends.
"Bobby, You have yet to answer the question. Which jurisdiction are you in?"
Oklahoma, USA, which tends to have overbearing laws in general. (E.g., you have to have a license to sell a coffin.)
"IMO the furniture/rain alarm/clock radio comments are nonsense, get real people."
No, the...
GTstartup, I'm just going by what the PE laws say. In many jurisdictions, they cover everything under the sun that requires an engineering education to do properly.
"Are you saying that every component on a car was or should have been designed by a PE?"
Many of the components, yes. Several...
"First off, much of the oil and gas work is exempt under industrial exemptions."
Do you have a citation to back this up for any U.S. state? I find no exemptions in my state's laws.
"A second exemption is for 'manufactured items'."
Citation, please. The laws of my state explicitly extend to...
sundale is quite right: the PE regulations are extremely broad and vague, while also sounding scary. In many fields there are almost no PEs left because licensing is ambiguous and difficult.
My suggestions for not getting chopped up by the bureaucracy:
1. Do decent work. If your machine...
Give it a try! It might work badly, but probably won't fry the stereo. Pick one that doesn't need a minimum load on the 3.3 and 5 volt outputs, and stay away from the cheapest models. Do not attach one of those giant car stereo capacitors: it might make the power supply oscillate, and it's...
"The charger will handle the details but it's actual battery nominal voltage, and chemistry to be charged is sent to it via serial comm."
Does the serial protocol use an error detecting code? The CCITT-16 CRC algorithm is reasonably good at detecting errors, and a table-driven implementation...
