modified 9 years ago

Regulated Transformer output

unlisted

I built this Power Supply for quick multiple voltage bench top Supply, for testing of LEDs & circuit's.

I used the first lm2596 too produce the 5 volt up to 3 amps and the second lm2596 for a 12 volt reference voltage controlling the transistor for the 5 amp regulated output. 

I built the Power Supply inside a deep single switch plastic electrical (handy) box.

After construction and 3 hour load testing of transformer and circuit's, the heat started building up in the small plastic project box.
I stopped the test and added a small 5 volt fan to move some air around the transformer.
I resume the load testing for 6 more hours with no problems or heat build up.

Parts used:
1-3055 transistor
2-lm2596 dc to DC buck converter.
1-2x4 electrical box extra deep size.
1-2x4 box cover
1-240v to 24v air conditioning Transformer.
(This is powered by a 125v outlet)
1-5 position terminal strip.
( a output for testing circuit's)
1-small fan to remove heat from the box.

Ewie

9 years ago

Really cool!

x35m95

9 years ago

Awesome!!!

hurz

9 years ago

And from were do you get the strange 125V? Have you measured the voltages and compared to the simulated ones? Is the transformer ratio as it is in reality?

nikisalli

9 years ago

125v? What?

yra

9 years ago

In my area of the us our wall supply is at 125 Volt's. I know this is strange to most. The transformer produced about 18.4 volt after bridge and cap listed. Thanks for asking.

yra

9 years ago

Different places across the US the wall power will very from 110v - 125v depending on age of power systems and proximity to the power plants in the area. Lower volt system are very old. We have a digital controlled grid ( smart grid) & fiber internet @ 100meg to 1gig.

hurz

9 years ago

Wow, so cool high technology around you in your country. I recommend to take a book and read something about rms (root mean square) and you might see whats wrong with your circuit.

rich11292000

9 years ago

Well the digital multimeter is not going to tell him the peak of his real circuit, this confusion makes one think their real world rms value is the same as EC's peak value. The numbers from the real world DO match EC's, however the real world is rms and EC is peak.

rich11292000

9 years ago

125*1.414=176 volts peak. This is the value EC needs. 176 volts peak is your wall outlet's peak voltage.

hurz

9 years ago

Its interesting how many users does know that. Latest circuit from buggzy (user with some electronic education) is also wrong. There is no easy way to change that. Probably only by Igor to enter values of sources in rms only?

yra

9 years ago

If a hobbyists sets up this circuit and used a D.M.M. this drawing will show the results to expect and at what point. So if things don't match, they will look for a problem. Please if you are a advanced eee don't flame. This circuit is not for you to use only for a novice level.

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