Electronics > Projects, Designs, and Technical Stuff

Caps across chokes trick

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MagicSmoker:

--- Quote from: 001 on October 13, 2019, 10:26:54 am ---I`m boatanchor  so don`t worry about  :palm: Steel is still cheap

--- End quote ---

And ferrite + all the other components to use it is even cheaper on a $/W basis (or any other currency).

coppercone2:
I suspect there is a split between hobbyists that have mechanical/metalworking skills and hobbyist that don't which concerns me. I suspect this split will widen as the use of thinking machines that manufacture boxes increases. People like having things work for them.

I also suspect that getting capabilities to quickly manufacture metal boxes of whatever size you want with welding and stuff is actually pretty cheap, so long you don't fall into the trap of thinking that you will also build a roll cage for a ATV one day and go over kill on things.

I kind of wonder if you can do a rough d-sub actually using just a plasma cutter with a high fidelity nozzle. I will try to make a template. For ones that can do punch through.

001:

--- Quote from: coppercone2 on October 13, 2019, 02:57:53 pm ---I suspect there is a split between hobbyists that have mechanical/metalworking skills and hobbyist that don't which concerns me. I suspect this split will widen as the use of thinking machines that manufacture boxes increases. People like having things work for them.

I also suspect that getting capabilities to quickly manufacture metal boxes of whatever size you want with welding and stuff is actually pretty cheap, so long you don't fall into the trap of thinking that you will also build a roll cage for a ATV one day and go over kill on things.

I kind of wonder if you can do a rough d-sub actually using just a plasma cutter with a high fidelity nozzle. I will try to make a template. For ones that can do punch through.

--- End quote ---

It is hard to understand for me. Is it some US wellknown story or idiom?  :-//
This tread is about LC trick with old iron, not philosophy

coppercone2:
some how my post ended up in this thread not the square holes thread, i had just gotten out of bed

floobydust:

--- Quote from: 001 on October 13, 2019, 03:51:03 pm ---... This tread is about LC trick...
--- End quote ---

Did you mean capacitor across LC... or CLC filter?

Just because a component is old or big and ugly, electrons don't discriminate. I have 5H 300mA inductors, mostly as paper weights and one in a power supply.
These have an anti-sat air-gap and possess leakage inductance, noobs miss that on their Spice sims.

In an LC filter, the choke's leakage inductance causes big problems for the rectifiers. Doesn't matter if they are solid-state or 866A mercury vapor beasts.

I have these old scope waveforms of 600VDC PSU LC filter (choke input) and adding a snubber across the 5H inductor.
You can just put your scope probe a few inches away to see the waveform too, if there is switching hash and spikes which shows up with no snubber. If you are doing single-ended, class A amps, they can have noisy power. I wanted to try SiC rectifier diodes as they apparently have no reverse-recovery, but need around 3kV.

You can see adding a capacitor across a choke, mutes the leakage inductance spike but makes the choke ring. Traces are 100V/DIV.

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