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 Power supply build.
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TinMan
Advanced Member


4082 Posts

Posted - March 05 2013 :  02:11:36  Show Profile Send TinMan a Private Message  Reply with Quote
Im looking to build a decent variable power supply.
I have come across this one that irondmax designed.
Whats your thoughts guy's?
Will it be a good one that can take the knock's?
I have removed 2 of the transistors to give us a total of four.
This will be more than enough for 20 amp's,as each transistor can handle 16 amp;s-but always over build when it come,s to power supplies.



swim at 90 degrees to the current and gain speed in two directions

skype-thetinman.69

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TinMan
Advanced Member



4082 Posts

Posted - March 05 2013 :  02:45:54  Show Profile Send TinMan a Private Message  Reply with Quote
Im thinking-should we not have a 1 or 2 ohm resistor on the base of each transistor aswell?-to make sure each transistor is getting the same amount of current to the base?

swim at 90 degrees to the current and gain speed in two directions

skype-thetinman.69
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Kudzu
Administrator



USA
1619 Posts

Posted - March 07 2013 :  00:06:03  Show Profile Send Kudzu a Private Message  Reply with Quote
Hey TM,
The circuit you posted looks like in a good housing it should be fairly robust .

I found this sight and they have tons of schematics ...
You must be logged in to see this link.

You must be logged in to see this link.


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TinMan
Advanced Member



4082 Posts

Posted - March 08 2013 :  05:28:31  Show Profile Send TinMan a Private Message  Reply with Quote
Hi Kudzu
Thanks for the links.
The build has started.
I have opted for the circuit above-but there will be a few extra gadgets on this power supply.
I am going for 20 amp's,so 4 transistors will be enough for this one-we can add more if needed.


swim at 90 degrees to the current and gain speed in two directions

skype-thetinman.69
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TinMan
Advanced Member



4082 Posts

Posted - March 08 2013 :  06:29:30  Show Profile Send TinMan a Private Message  Reply with Quote
Pt 1 is getting all our parts together,and selecting a decent box to place all the bits in.
I have opted for an old computor caseing,as it has lots of room for extra goodies.


swim at 90 degrees to the current and gain speed in two directions

skype-thetinman.69
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totoalas
Junior Member



Macao
168 Posts

Posted - March 08 2013 :  06:46:19  Show Profile Send totoalas a Private Message  Reply with Quote
can you include digital v and current led indicator i will this also good marks from irondmax
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Jet
Junior Member



Canada
129 Posts

Posted - March 08 2013 :  07:43:56  Show Profile  Visit Jet's Homepage Send Jet a Private Message  Reply with Quote
Hi TM,

Good topic.
Love the two in one, interesting approach.

It's one project to subscribe to!

TM, winter is coming for the part of the world.
Will you have this PS heater ready to keep toasty warm?

Jet
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TinMan
Advanced Member



4082 Posts

Posted - March 08 2013 :  08:46:10  Show Profile Send TinMan a Private Message  Reply with Quote
Hi Totoalis
Did you want that included in the schematic?

@ Jet
Yea,it should be finished by monday 11/03/13
It would be finished tomorow,but im still waiting for the transistors and lm317 to turn up in the mail.
It will now have 4 different functions
35v 20 amp power supply
24v 10 amp PWM
Frequency generator-square & sawtooth wave form.
And battery desulphator.
Might aswell go the whole hog.

Here is where we are up to now.


swim at 90 degrees to the current and gain speed in two directions

skype-thetinman.69
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totoalas
Junior Member



Macao
168 Posts

Posted - March 08 2013 :  09:56:11  Show Profile Send totoalas a Private Message  Reply with Quote
hitinman

please include ur add on functions as well

ill try to replicate as similar as possible with your high tech mod

cheers mate

totoalas
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TinMan
Advanced Member



4082 Posts

Posted - March 08 2013 :  10:27:12  Show Profile Send TinMan a Private Message  Reply with Quote
quote:
Originally posted by totoalas

hitinman

please include ur add on functions as well

ill try to replicate as similar as possible with your high tech mod

cheers mate

totoalas



Oh man-that will be one big scheamtic to draw lol.
Let me see how it turns out,and if all go's well-i will draw up a schematic.
No point in doing it yet ,as there may be smoke yet lol.

swim at 90 degrees to the current and gain speed in two directions

skype-thetinman.69
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IrishDave
Senior Member



Ireland
850 Posts

Posted - March 09 2013 :  05:47:14  Show Profile Send IrishDave a Private Message  Reply with Quote
Looking good TM.

That dead battery should work a treat on a 3 battery setup before it starts charging it - my testing has shown that the dead battery will recover much faster than a pulse charge.
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The_Architect
Average Member



USA
327 Posts

Posted - March 09 2013 :  08:21:20  Show Profile  Visit The_Architect's Homepage Send The_Architect a Private Message  Reply with Quote
HA HA you should do a reality TV show called, "there will be smoke!"with your host The TinMan (has to be said with the air you expect when some one says, "there will be blood" ;)


Violence is the last refuge of the incompetent
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TinMan
Advanced Member



4082 Posts

Posted - March 09 2013 :  22:32:42  Show Profile Send TinMan a Private Message  Reply with Quote
@ Dave
Which 3 battery setup are you using?-the one with the motor?

@ TA-im hopeing there will be no smoke this time lol.
But at the end of the day,i will have a decent power supply-all for under $100.oo

swim at 90 degrees to the current and gain speed in two directions

skype-thetinman.69
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TinMan
Advanced Member



4082 Posts

Posted - March 14 2013 :  01:01:14  Show Profile Send TinMan a Private Message  Reply with Quote
Well the parts finaly arrived yesterday, so it's on with the build tonight

swim at 90 degrees to the current and gain speed in two directions

skype-thetinman.69
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TinMan
Advanced Member



4082 Posts

Posted - March 16 2013 :  10:09:33  Show Profile Send TinMan a Private Message  Reply with Quote
Well i tried 3 times with the circuit i posted,but this power supply circuit is shocking.The voltage is very unstable,and when a load is place on it-the voltage rises along with the current(ofcourse) by about 3 volt's-depending on load.The transistors that should handle 15 amps each,get hot with only a 2 amp load at 12 volt's-and that is all six of them on a very large heat sink. While running a 24 volt dc motor at 12 volts,when a load was applied to the motor the volts would climb.The more load you put on the motor,the more the volts would climb.Then when i hit 3 amps,one transistor blew out.

Second circuit(all new parts)-exactly the same as the first attempt.Then while hooked to a HHO cell,we hit 3.2 amps-and bang,another transistor gone and all the rest very hot

3rd attempt- I printed out the schematic on A4,and built the circuit right on top of it with all new components (just incase i was making some stupid mistake),but once again the results were exactly the same.This time i even added 2 ohm resistors to the bass of each transistor to make sure they were sharing the current evenly.Only thing different this time was it blew out the lm317 aswell as another transistor-all transistors hot at only a 3 amp draw @ 12 volts.The input caps(4x 10000uf 63 volt's high current) voltage remained very stable at 37.4 volts.

This schematic has now been thrown in the bin.

swim at 90 degrees to the current and gain speed in two directions

skype-thetinman.69
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