Variable power supply

Guessing the emissions are as beautiful as the construction is...

Tim

-- Seven Transistor Labs, LLC Electrical Engineering Consultation and Contract Design Website:

Emissions ?

You lost me.

Andy

Fans suck. I've had to put fans in stuff I designed, but I never liked it. Better is to try and get (design) the heat to the edge of the box, and then an aluminum heat sink to the room air.

George H.

Input is 12VDC, not likely to be any emissions.

Thanks George.

The box is plastic.

Maybe the circuit board should get a little warm.?? I am not exceeding specs for the circuit board.

The component that gets warm is square and has a 330 marked on the top.

Andy

Ah, so not your design. 330 is perhaps a 3.3 ohm resistor? what does your DMM say when you measure across it. (no power)

George H.

Most likely a 330 uH inductor.

1.4 ohms

Andy

Except for having 330 on it, component looks like circled item.

Andy

Thanks.

Have to look that up.

Andy

'330' normally means 33.

NT

1.4 ohms is a lot of wire. On most that I have seen and used the 330 is the value in uH.

Electro-magnetic interference.

It is an inductor. Probably 33 uH.

that's an inductor, they're fairly heat resistant.

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his DMM says "1.4", I have a cheap one here that says that with the probes shorted, and a slightly more expensive one that doesn't.

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Thanks. Do fan is unnecessary ?

Andy

Fans are annoying, they are noisy, windy, like to collect dust, and they break.

It's sometimes easier to get a more capable module and experience less heating, it may say "3A" on the listing but I find that at 2A they are getting hot enough to worry me, and at 3A they tend to go into thermal shut down (ie: they overheat).

I changed to a more expensive module: maybe $2 instead of $1, this claims 5A, and at 3A in free air it only gets warm.

XL4005 is the chip it used, instead of LM2956. it could be this module:

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You forgot "expensive" but mostly, they break.

Or spend the extra cash on a better case/heatsink.