240vac to 12vdc

471

10:30:13

Simple circuit to show the relationship between output from the transformer (24vac), the two outputs from each half of the bridge rectifier (12vac) and the final output stage across the voltmeter (12vdc). If you remove the nodes for all the outputs except the voltmeter, you will see the saw tooth pattern associated with unregulated supplies.
Add an LM317 and you will have a regulated 5vdc output.

published 9 years ago

justinmh

9 years ago

You don't really need the voltage controlled voltage source here, just up the voltage on the ac power source.

justinmh

9 years ago

If you Use a lm7805, that is a set 5 volt reg, not an adjustable one like the lm317.

BillyT

9 years ago

Earthing the output of the transformer instead of the negative DC rail can cause problems when the power supply is interfaced with other circuits.

giomix

9 years ago

240 vac are rms, so peak is the square of 2 mulltiplied rms 330vac, 660 peak to peak

bfgstew

9 years ago

Justin, can only change Hz on ac supply thats why using ac power source. Correct on 7805, my mistake. Billy, my mistake on earthing transformer, whoops! Changed the outcome slightly but still works nicely and was what i was after. Giomix, its only simulation, no need to get into rms, can every circuit show TRUE rms? Thanks for your comments. Happy New Year to you all.

justinmh

9 years ago

You can change the frequency, the phase, the amplitude, and the dc offset of the ac power supply. Just click or tap on the frequency and it will bring up the list of things you can change. Click on what you want to change from there.

bfgstew

9 years ago

Thanks for that Justin, not realised that was possible.

justinmh

9 years ago

No problem, now that will make the app more useful for you I hope.

justinmh

9 years ago

@geomix, the 240 here is peak, the get the rms multiple 240 by sqrt(1/2), or .707, to convert from rms to peak divide the rms by .707. In this case the rms is 170. And the peak to peak is 480.

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