voltage injection BPS

[jackx]

Dumb noob question....
Linear is said to be better than switching and a must have. I haven't seen a reason for this.
Can someone tell me?

I have a switching 30v10a, with on/off and an output switch. It can be shorted.

[Terry Bites]

Said by who?
Well, it depends on the situation and how old you are.
A lot of old buggers are still profoundly traumatised from the switcher encounters (alien probing mostly) that they had in the 70's and 80's.
I had me some therapy and have moved on now.

Modern switchers can outperform many linear supply dseigns on all fronts.
I've seen a lot of crappy linear supplies down the years.
I've also seen more bit of kit destroyed by linear supply failures than by supposedly satanic switchers.
Engineers often regard the linear PSU part of their project as trivial, and it aint.
Of course, there are good and bad and ugly switchers out there- you get what you pay for, by and large.

Switchers are more reliable, cheaper to buy/ make and can very efficient and compact.
Applying them requires you to be a bit more inteligent about your wiring or layout though. Filtering and shielding too.

Most consumer (and pro) AV products work just fine with their switchers.
Recording studio and broadcast gear is almost entirely smps powered now.

But if you're not well informed about psus you can fall into the Trumpian nightmare of audofoolery misinformation.

These days I only use linear for low level and precision stuff. Horses for courses

[u666sa]

Linear is more reliable, but switching is cheaper and good enough.

The only time I had trouble with switching, is when I connected my switching PSU to 5 watt radio and jammed a frequency. Power supply would shut down if it was near the transmitter. I had to move it further away from transmitter for proper work.

[TimFox]

I used to build large arrays of x-ray detectors, and we used linear power supplies for noise reasons.
The younger engineers wanted to use switchers, and I replied that it was possible but that they had to budget engineering time to ensure noise performance, since the switching frequencies were in a range that our analog electronics was susceptible to.
Hand-waving doesn't count:  the switching noise can be radiated, imposed on the DC outputs, and conducted back to the AC mains.
There are engineering solutions for all of these problems.
Linear power supplies have lower efficiency and generate more heat, but can be more quiet if properly built.