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I know you said you don’t have access to cnc, but highly consider buying a laser diode engraver from banggood or ebay or whatever. I have a 2.5w laser module connected to my desktop cnc mill. I

Muriatic acid is hydrochloric acid, often called Spirits of Salt here. Amazon sells it, as do most hardware shops. Leon

Hi, I need a way to make small cheap SMT stencils at home - I do not have a CNC or have access to one so I would prefer the toner transfer and etching method that seems popular in some

Can someone help me understand how to use EasyEda?? A friend found a module on there that I have been looking for.? I can load it into EasyEda.? I have both the online version and a stand alone

/g/electronics101/topics -- Steven Greenfield AE7HD

Thanks Donald, I will check that out.

P channel power FET, Drain to voltage input, gate to ground, source to circuit.? Your limit is the allowable gate to source voltage on the FET and current rating of the FET. Draw the bridge, put +

Have a look at https://hackaday.com/2011/12/06/reverse-voltage-protection-with-a-p-fet/ There are many sites with similar/identical circuits for reverse voltage protection. Donald. -- *Plain Text*

Think of "I don't care which way the power got plugged in" as AC.? Think of power to your circuit as DC from the bridge. For battery circuits, that two diode drop can be significant, even if you use

Ok, I will look that up to better understand that. I learn something new everyday. And that is a good thing. :) Thanks, Dave

Cool. That is good to know. I am only familiar with things like rectifier bridges on auto alternators and magnetos. Thanks, Dave

People call it polarity independent powering

Helps if you think of AC as DC that keeps getting it's polarity reversed. So yes, a diode bridge will let DC through, but one polarity will get flipped. Tony

TYPO: I meant fuse.

That sounds like it needs me to go do some research on that one. :) I use a PTC fues for protection on the USB powered version but my other boards use battery power from 2.4 to whatever voltage but

I thought a diode bridge or bridge rectifier was to convert AC to DC. So does a diode bridge work on DC? Thanks, Dave

That takes care of the power supply polarity to the board (you might want to investigate a P Channel FET for a power protection device, it works for reverse polarity as long as you don't exceed a

Dave, The easy, foolproof way is to add a diode bridge and it does not matter how it is plugged in. The drawback is that you have two extra diode voltage drops. Bertho

Sounds like you've got the right attitude and plan, then. Keep it up. Donald. -- *Plain Text* email -- it's an accessibility issue () no proprietary attachments; no html mail /\

Donald, ? Of course doing it right the first time is the plan. I was just asking noob like questions just in case there was a use for that. I used to (and still do a little) program software and I