[sdiy] best ways of portable +/- supply

[Paul Maddox]

Dan,

http://www.robertswarr.com/data/hes14-2003.pdf

taken from - http://www.robertswarr.com/p/hitron-power-supplies/external-switching-ac-dc

They can't be the only company making them..

Paul

On Tue, Jun 12, 2012 at 6:39 PM, dan snazelle <subjectivity at hotmail.com> wrote:
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> On Jun 12, 2012, at 1:11 PM, Paul Maddox wrote:
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>> Would be helpful to understand more about your requirements.
>> That said, you can buy power supplys with dual outputs.
>>
>> I have a couple, takes an IEC C13 input and dives a 6pin DIN output
>> with +12 and -12 at 1A each.
>> It's pretty small too.
>>
>> Paul
>>
>> '
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> wow
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> I would LOVE to know more about these dual supply wall warts!!!!
>
> my requirements are pretty flexible==enough power for a handful of opamps, some OTA's, a few LEDS, and some transistors but I can always use low power parts if needed
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> what are the prices like?
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> thanks
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> Dan
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>> On Tue, Jun 12, 2012 at 5:05 PM, dan snazelle <subjectivity at hotmail.com> wrote:
>>> does anyone have opinions on the best way to get plus and minus rails into a portable synth/noisenaker/stompbox type project  WITHOUT using an on board transformer?
>>>
>>>
>>> the options I know of are
>>>
>>> 1.AC to DC conversion (ac wallwart plugs in and is converted with regulators and caps to a DC dual supply.  Kind of bulky due to use of large caps.
>>>
>>>
>>> 2. Big DC wallwart....a 24 volts wallart would easily get plus and minus 10 volts once regulated. CHEAP and EASY. what are the downsides to this setup?
>>>
>>> 3. DC2DC converters (put in 5 volts get out +/- 15 or +/- 12volts//////) convenient BUT very expensive, bulky, they get very warm and can be destroyed with overvoltage quite easily.
>>>
>>> 4. CHARGE PUMP chips (max1044 etc)    cheap, easy...... VERY PRONE to destruction from over-voltage and static electricity. (though they are used in some pro boxes like the Moog Pedals so there must be ways
>>> to make them less error prone)
>>>
>>>
>>>
>>>
>>>
>>> Often I am hit with a LIGHTBULB kind of a moment "oh this would be such a great project....so few parts and I could put it in a tiny box!" and then i realize that I will have to provide 2 batteries or a charge pump. Suddenly the small box is a bigger box and the
>>> amount of parts has grown.
>>>
>>>
>>>
>>>
>>>
>>> I have been messing around with the max1044/LT1045 charge pumps but overall I think they are a bit too delicate for road use....i have had a few MAX1044's die just from having a power supply
>>> hooked up to them which briefly spiked at a higher voltage than 10 volts
>>>
>>>
>>> (my Bench supply, when you turn it on, it seems to jump to a very high voltage for a split second....most chips seem fine with this but not the charge pumps (luckily I figured it  out quickly!)
>>>
>>>
>>> Maybe there are ways of protecting these power conversion chips I dont know about. (i usually just put a zener in front of them to keep the incoming power in the proper range)
>>>
>>>
>>> ANY thoughts/advice appreciated
>>>
>>> thanks
>>>
>>>
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>