Is 3 Watts really too much to ask?

Were you born rude, Doomie?

I *was* being polite! I thanked Sylvie but you snipped that bit off!

I came up as an unread post - probably as a result of my inadvertently reversing the sort order on dates.

Still, I learned about the potted regulators, so it wasn't a complete waste of time for me.

Sylvia.

That was almost two years ago!!!

R on the input is easy & works. But 6v is too low. Re automotive transients, cars today typically switch accessory sockets off when harsh transients are likely, so diode protection should suffice, or even none if you're willing to accept the risk.

But power will fail when the battery gets lowish.

Use a high voltage regulator that saturates and provides a virtual short when the battery voltage is too low. Then the output regulator still gets enough voltage to remain in operation.

I once wondered how can I get an input with widest voltage range. Those 70V regulators help a lot in that.

On a sunny day (Sat, 08 Jan 2022 21:20:26 +0200) it happened LM snipped-for-privacy@mail.com wrote in snipped-for-privacy@4ax.com:

I just ue LM2596 needs one inductor, some caps, some resistors, it is a 150 kHz switcher, 45 V max input. There are fixed voltage versions, but by adding resistors to the 3.3 V version feedback you can make any output voltage > 3.3V.

We use LM2576HV-ADJ, which tolerates 60 volts in and is rated for 3 amps out. It runs at 52 KHz, so needs huge L and C.

A few of our products start with a kilowatt or so of 48 volt MeanWell supply, so we need to step down to 12 or 15 volts for secondary linear and switching regs.

lørdag den 8. januar 2022 kl. 20.57.15 UTC+1 skrev Jan Panteltje:

On a sunny day (Sat, 8 Jan 2022 14:27:46 -0800 (PST)) it happened Lasse Langwadt Christensen snipped-for-privacy@fonz.dk wrote in snipped-for-privacy@googlegroups.com:

Hard to beat that price!

I have a few of different kind ebay buck and buck/boost converters, these have 10 turn trimpots to set voltage and currrent limits,

boost:

On a sunny day (Sat, 08 Jan 2022 13:27:42 -0800) it happened snipped-for-privacy@highlandsniptechnology.com wrote in snipped-for-privacy@4ax.com:

Nice box, fan blows out via the back? Yes those Meanswell, I have 7 or more? 7 V versions and series those if needed.

Cheap and good. The 1 KW 48v supply costs us $156 and it can actually make a good bit more than 1 KW.

The three class-D amps in that box each have their own fan on the bottom. That air flow cools the big toroids too.

We're designing a new 3U power chassis now, sort of a next gen modular power system. We ordered a mess of custom plastic pieces from Tap Plastics to make a mockup chassis. We'll play with placements and fans and holes and heat sinks to sorta optimize it. We have no tools to simulate this sort of thermal thing.

I love Tap Plastics.

On a sunny day (Sun, 09 Jan 2022 07:54:59 -0800) it happened snipped-for-privacy@highlandsniptechnology.com wrote in snipped-for-privacy@4ax.com:

Indeed high power inductors get hot, here is a different kind of air cooling:

Keeps the drone in the air indefinately, for example with an antenne (RF via same coax) or camera (wireless).

Outdoor lab! With all that grass, I'm guessing that it might rain sometimes.

On a sunny day (Sun, 09 Jan 2022 10:46:46 -0800) it happened snipped-for-privacy@highlandsniptechnology.com wrote in snipped-for-privacy@4ax.com:

Where I am now the garden is much bigger, and at the end there is a wooden hut, I keep my bike, grass mower and stuff in there, some electronics could find a place there. Unfortunately big brothel had made the place a no-fly zone for drones, too close to Leeuwarden mil airport, and F35s making a lot of noise coming over very low. OTOH there are grapes growing next to that hut, and those are not sour :-)

We grow lemons. The local Meyer lemons aren't actually very sour. They make dynamite lemon pies.

On a sunny day (Sun, 09 Jan 2022 23:24:55 -0800) it happened snipped-for-privacy@highlandsniptechnology.com wrote in snipped-for-privacy@4ax.com:

Nice!