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'[EE]: is it really not DC, so what can I do ?'
2001\12\28@085853 by Tal Bejerano - AMC

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So what can I do to have 5-10A 12vdc without transformer?
I need some switching power supply circuit

does anyone saw on the 'net simple switching PSU circuit?
I know I have to do some coil stuff, but it worth it.
Helllllpppppppppp

Tal

{Original Message removed}

2001\12\28@091004 by Sean Alcorn - Avion Sydney

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on 29/12/01 12:55 AM, Tal Bejerano - AMC at spam_OUTkooterTakeThisOuTspamZAHAV.NET.IL wrote:

Tal,

> does anyone saw on the 'net simple switching PSU circuit?
> I know I have to do some coil stuff, but it worth it.
> Helllllpppppppppp

Are you looking for just one or thousands? What voltage(s) do you need, for
what application and at what currents?

If just one, I would follow the advice of others that have replied to you
and NOT use that unit you have - especially for experimenting. A cheap
(approved) "plug pack" or "wall wart" would be a safer option for you.

Regards,

Sean

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2001\12\28@092114 by Tal Bejerano - AMC

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Hi Sean

I am looking for a PSU to supply 12VDC for my MP3 Car Player at home, I
measure it's current consumption and found that it consume about 5A. I want
to build it my self cause it's very expensive to buy it ready made.
Just looking for a site with such circuits.

Tal


{Original Message removed}

2001\12\28@093059 by Sean Alcorn - Avion Sydney

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on 29/12/01 1:16 AM, Tal Bejerano - AMC at .....kooterKILLspamspam@spam@ZAHAV.NET.IL wrote:

Hi Tal,

> I am looking for a PSU to supply 12VDC for my MP3 Car Player at home, I
> measure it's current consumption and found that it consume about 5A. I want
> to build it my self cause it's very expensive to buy it ready made.
> Just looking for a site with such circuits.

OK, I'll see what I can do for you. It's late in this part of the world, so
I will take a look in the morning.

Regards,

Sean

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2001\12\28@094020 by Tal Bejerano - AMC
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Thanks Sean

I am waiting

Tal

-----Original Message-----
From: pic microcontroller discussion list [PICLISTspamKILLspamMITVMA.MIT.EDU]On
Behalf Of Sean Alcorn - Avion Sydney
Sent: Friday, December 28, 2001 4:28 PM
To: .....PICLISTKILLspamspam.....MITVMA.MIT.EDU
Subject: Re: [EE]: is it really not DC, so what can I do ?


on 29/12/01 1:16 AM, Tal Bejerano - AMC at EraseMEkooterspam_OUTspamTakeThisOuTZAHAV.NET.IL wrote:

Hi Tal,

> I am looking for a PSU to supply 12VDC for my MP3 Car Player at home, I
> measure it's current consumption and found that it consume about 5A. I
want
> to build it my self cause it's very expensive to buy it ready made.
> Just looking for a site with such circuits.

OK, I'll see what I can do for you. It's late in this part of the world, so
I will take a look in the morning.

Regards,

Sean

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2001\12\28@104846 by Herbert Graf

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What about computer power supplies? They can be had for $5 where I live. Do
you have size constraints? TTYL

> {Original Message removed}

2001\12\28@110020 by Tal Bejerano - AMC

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Hi Herbert!

Where i can finf 5$ PSU ?
If u can give me a site that sell those PSUs i will buy it.

Tal


{Original Message removed}

2001\12\28@113140 by Herbert Graf

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I don't know of any site on the net, however there are several used computer
places in my area that sell used ones for that price, I'm certain you could
find something similar in your area. There are also online surplus sites
that sell things like that. One I go to is http://www.bgmicro.com, they
might have what you are looking for. TTYL

> {Original Message removed}

2001\12\28@114957 by Lawrence Lile

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Tal,

I'd recommend building a power supply, especially if you have not built one
before.  If you have, then ignore this message.

When I hire a new technician, I tell him he'll be needing a variable power
supply for his bench, and he must build one.  It's sort of a rite of
passage, and if the guy can do a neat wiring job on his benchtop wonder,
then he's good enough to wire something else.  Building them is a good
exercise for the new engineer.

I often start with a car battery charger.  Good high amperage transformer,
heavy diodes, and a case, all in a cheap mass produced package.  Add a
voltmeter, a few capacitors, inductor, big pass transistor, a PIC and a
knob, and you've got a nice bench power supply.

Of course if this is "old hat" to you then just go buy one.

--Lawrence


----- Original Message -----
From: "Tal Bejerano - AMC" <kooterspamspam_OUTZAHAV.NET.IL>
To: <@spam@PICLISTKILLspamspamMITVMA.MIT.EDU>
Sent: Friday, December 28, 2001 9:54 AM
Subject: Re: [EE]: is it really not DC, so what can I do ?


> Hi Herbert!
>
> Where i can finf 5$ PSU ?
> If u can give me a site that sell those PSUs i will buy it.
>
> Tal
>
>
> {Original Message removed}

2001\12\28@121904 by Dal Wheeler

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I'm not sure where you are from; but used PC-AT type PSU's can be had at
most computer shops for almost nothing.  Another place to look is thrift
stores --for me, this used to be a good place to find large
transformers --old satellite dish positioning motor power supplies.  The
disposable age has been kind to me...

If you want to online order, a few other places to look:
http://www.alltronics.com, http://www.jameco.com , http://www.candhsales.com ,
http://www.allelectronics.com

----- Original Message -----
From: Tal Bejerano - AMC <KILLspamkooterKILLspamspamZAHAV.NET.IL>
To: <RemoveMEPICLISTTakeThisOuTspamMITVMA.MIT.EDU>
Sent: Friday, December 28, 2001 8:54 AM
Subject: Re: [EE]: is it really not DC, so what can I do ?


> Hi Herbert!
>
> Where i can finf 5$ PSU ?
> If u can give me a site that sell those PSUs i will buy it.

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2001\12\28@132936 by Lawrence Lile

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> why do you need the pic? cant you just use like a few capacitors, a
> rectifier (or 4 diodes, depending) a LM317
Been there, done that, got the T-shirt, wore it out, sold it to Goodwill.
LM317's are simple, but they won't handle more than an amp, won't dial down
to less than 1.2 volts, pots are hard to adjust in tiny increments, and
LM317's are linear so they waste lots of power.  I've prolly built a dozen
supplies with them.

You won't get 5 amps out of an LM317 without a bunch of extra parts.

I built a nice little bench supply with a PIC running a P-Channel pass
transistor, threw in an inductor and a capacitor and two pushbutton inputs
to the PIC.  The PIC senses output voltage, and turns the pass transistor on
and off.  The two pushbutton inputs run the setpoint up and down.  A little
digital panel meter serves as the interface, you just push the UP button if
you want the voltage higher, etc.  None of the part values seemed to be very
critical, worked pretty good first time with junk parts off my bench.

Running behind a stable 24V power source it seems to give pretty good
regulation and will provide lots of current if required, will dial down to
less than .25 volts, and can be adjusted in micro-increments.  Used a 16F873
so I could use the 10 bit A/D for lots of fine adjustment.

Of course there are 1000 circuits using LM317's plus pass transistors.  I
just wanted to build a switcher with a PIC in it, so I could slap a sticker
on it saying "PIC INSIDE!"

--Lawrence

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2001\12\28@141308 by dpharris

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Can we have the details?  ie schematic?
Thanks, David

Lawrence Lile wrote:

{Quote hidden}

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2001\12\29@050906 by Peter L. Peres

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> very expensive 5A 12V supply

It costs less than $40 (<180 NIS at current rate) including all taxes and
delivery probably. If you want to make your own it is a good learning
project but maybe you should not start with a smpsu ...

Buying the parts separately will get yuo to the same price level (150W
toroidal halogen transformer, bridge, capacitors, LM... + transistor
series regulator, board, case, connector, switch).

0.02 Agorot,

Peter

PS: Check that current spec, it is more than likely not 5A continuous. You
want to know the RMS rating for continuous power.

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2001\12\30@012415 by Alexandre Domingos F. Souza

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>You won't get 5 amps out of an LM317 without a bunch of extra parts.

       Maybe you can get from the TO-3 LM317. But be sure you gotta use a BIG active heatsink (e.g.: with a fan)

>I built a nice little bench supply with a PIC running a P-Channel pass
>transistor, threw in an inductor and a capacitor and two pushbutton inputs
>to the PIC.  The PIC senses output voltage, and turns the pass transistor
>on
>and off.  The two pushbutton inputs run the setpoint up and down.  A little
>digital panel meter serves as the interface, you just push the UP button if
>you want the voltage higher, etc.  None of the part values seemed to be
>very
>critical, worked pretty good first time with junk parts off my bench.

       Hmmm, Miss the times where we used simple zeners or UA723 for regulating power ;o)

>Running behind a stable 24V power source it seems to give pretty good
>regulation and will provide lots of current if required, will dial down to
>less than .25 volts, and can be adjusted in micro-increments.  Used a
>16F873
>so I could use the 10 bit A/D for lots of fine adjustment.

       Wow, that's nice! ;oD

>Of course there are 1000 circuits using LM317's plus pass transistors.  I
>just wanted to build a switcher with a PIC in it, so I could slap a sticker
>on it saying "PIC INSIDE!"

       Hahaha, nice touch ;o)


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Alexandre Souza
spamBeGonetaitospamBeGonespamterra.com.br
http://planeta.terra.com.br/lazer/pinball/

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