Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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Default adapting 12vdc to 9vdc


Kripton wrote:

On 2012-01-27 03:38:55 +0100, "Michael A. Terrell"
said:


Chas wrote:

I plan to use a ''boombox" in my vehicle because the existing sound device
is defective and next to impossible to remove.
My boombox uses 6 AA batteries...would it be safe to just run a plug from
the 12v cig lighter to a power plug on the boombox? I imagine I will need
some sort of voltage reducer. Anyone got any ideas on how one could build
such a reducer. I am fearing such a device may induce noise.
. . . . .I am of an understanding that 1.5v batterys are acutally 1.2v. Is
this correct? If so, I could run the 12v car voltage to 10 AA batterys and
then tap off six batterys....
Else, if the AA's are truly 1.5 volts then run the 12v car power to 8 of the
AA's and tap off 6.
any help would be greatly appreciated.. . . chas



http://www.ebay.com/itm/180763839264 is an adjustble 3A buck
regulator for less than $5. It's a switch mode power supply, so it won't
generate a lot of waste heat.


and more searching on ebay for "LM2596" gives you the same board for
$2.5 shipped ...
and agree it does not generate waste heat !
but they don't seems to search for a smart solution...



Whatever. A simple, adjustable switcher that doen't need any design
work to use is a good idea for people who aren't equipped to design a
power supply from scratch.

--
You can't have a sense of humor, if you have no sense.
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Default adapting 12vdc to 9vdc

On 1/28/2012 3:02 AM, Michael A. Terrell wrote:

Kripton wrote:

On 2012-01-27 03:38:55 +0100, "Michael A. Terrell"
said:


Chas wrote:

I plan to use a ''boombox" in my vehicle because the existing sound device
is defective and next to impossible to remove.
My boombox uses 6 AA batteries...would it be safe to just run a plug from
the 12v cig lighter to a power plug on the boombox? I imagine I will need
some sort of voltage reducer. Anyone got any ideas on how one could build
such a reducer. I am fearing such a device may induce noise.
. . . . .I am of an understanding that 1.5v batterys are acutally 1.2v. Is
this correct? If so, I could run the 12v car voltage to 10 AA batterys and
then tap off six batterys....
Else, if the AA's are truly 1.5 volts then run the 12v car power to 8 of the
AA's and tap off 6.
any help would be greatly appreciated.. . . chas


http://www.ebay.com/itm/180763839264 is an adjustble 3A buck
regulator for less than $5. It's a switch mode power supply, so it won't
generate a lot of waste heat.


and more searching on ebay for "LM2596" gives you the same board for
$2.5 shipped ...
and agree it does not generate waste heat !
but they don't seems to search for a smart solution...



Whatever. A simple, adjustable switcher that doen't need any design
work to use is a good idea for people who aren't equipped to design a
power supply from scratch.

And those who think they can't etch a circuit board, order the parts from
Digikey at single unit prices plus shipping, build/test it for
less than $2.50.

Just because you can, doesn't mean you should.
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Default adapting 12vdc to 9vdc


mike wrote:

On 1/28/2012 3:02 AM, Michael A. Terrell wrote:

Kripton wrote:

On 2012-01-27 03:38:55 +0100, "Michael A. Terrell"
said:


Chas wrote:

I plan to use a ''boombox" in my vehicle because the existing sound device
is defective and next to impossible to remove.
My boombox uses 6 AA batteries...would it be safe to just run a plug from
the 12v cig lighter to a power plug on the boombox? I imagine I will need
some sort of voltage reducer. Anyone got any ideas on how one could build
such a reducer. I am fearing such a device may induce noise.
. . . . .I am of an understanding that 1.5v batterys are acutally 1.2v. Is
this correct? If so, I could run the 12v car voltage to 10 AA batterys and
then tap off six batterys....
Else, if the AA's are truly 1.5 volts then run the 12v car power to 8 of the
AA's and tap off 6.
any help would be greatly appreciated.. . . chas


http://www.ebay.com/itm/180763839264 is an adjustble 3A buck
regulator for less than $5. It's a switch mode power supply, so it won't
generate a lot of waste heat.

and more searching on ebay for "LM2596" gives you the same board for
$2.5 shipped ...
and agree it does not generate waste heat !
but they don't seems to search for a smart solution...



Whatever. A simple, adjustable switcher that doen't need any design
work to use is a good idea for people who aren't equipped to design a
power supply from scratch.

And those who think they can't etch a circuit board, order the parts from
Digikey at single unit prices plus shipping, build/test it for
less than $2.50.

Just because you can, doesn't mean you should.



Unless you plan on building a lot of them. I've worked in electronics
manufacturing, and it's not as simple as most people think. We had
three reflow ovens, a preheat cabinet and a 10 * 40 foot room where
boards were cleaned. First, in a commercial board washer, then
inspected and cleaned by hand, if needed. Most components don't go
cheap, if you buy under 1000 at a time. Some at 5,000 and others at
50,000.


--
You can't have a sense of humor, if you have no sense.
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