Current Transients -- Choke?

Yes, an inductor can help. But not really if the on/off cycles are longer than a few hundred msec. And be careful since inductors generate nasty spikes upon a load dump.

You can use this tool to see the effect of various sizes of inductors:

Just pretend the transformer isn't there. Or throw your circuit onto LTSpice. Another trick is to tap the heavy motor current off before the regulators to the other parts of the board.

Handy site!. I'm just sorting a 6V pos earth, to 12V neg earth, switcher design for a friend who deals in old car radios. Repetitive calcs to home in on a decent wire size and core are not my area of fun, so was a pleasure to just click the buttons and see the results. An ETD44 showed in the list (I've piles of 'em :) and it seems I now need a few more turns :(.

There you guys in Europe have it easier. Schmidt-Walter's site favors Siemens cores, or now Epcos. Not that popular out here in the Wild West.

"blanko"

What do you think voltage regulators are for ??

..... Phil

Just remember that the old tube 6V car radios used positive as well as negative ground (chassis) depending if they were made for the US or for Europe.

The old radios actually had a polarity switch. Most of Europe's cars were negative ground but some French models were not.

He doesn't say if the regulators are dropping out with the dips. A low forward drop diode and large cap on the critical supply can serve to decouple the PS dips. I'm running some servo motors from the same unregulated supply as my op amps and used that technique with good results.

Set your PC's clock correctly, you idiot.

Here in the US, all of the 6V car radios i had seen were fixed polarity and had no switch. In fact, the construction prevented the use of a switch, as the chassis was used as circuit ground for everything, from input power to plate filter caps to audio output...

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