7.5v regulator.

iloveelectronic · Feb 1, 2007

hi,

i need a 7.5v regulator, but i can't find any diagram on google, can someone please post a 7.5v regulator in here please? thx

House0Fwax · Feb 1, 2007

Here's a link to a variable regulator schematic;

**broken link removed**
LM317 Voltage Regulator

iloveelectronic · Feb 1, 2007

wow this regulator look intense. is there a simple regulator that regulates from 12 v into 7.5 v?

House0Fwax · Feb 1, 2007

iloveelectronic said:
is there a simple regulator that regulates from 12 v into 7.5 v?

Not that I'm aware of.

iloveelectronic said:
wow this regulator look intense.

Intense ? but It only uses 5 components.

iloveelectronic · Feb 1, 2007

i know but it look really chunky. i kinda need like one that's small and compact.do i really need to use a heat sink?

House0Fwax · Feb 1, 2007

iloveelectronic said:
do i really need to use a heat sink?

Depends entirely on what you are powering with it.

As for being 'chunky' you don't have to use the pot as the website does, you can use a preset.

iloveelectronic · Feb 1, 2007

kk awsome thx..

ericgibbs · Feb 1, 2007

hi ILE,
You can use a 78L05 or equivalent [about 150mA].
Connect a series resistor between the 78L05 Gnd[0v] pin and 0v.

If you have a low value variable resistor, say [1K0] use that, adjust the
resistor to give you +7.5V

You can use a 7805 for higher currents.

Regards
EriG

iloveelectronic · Feb 1, 2007

hi eric

cool, cause like few hours ago i build a 5 volt regulator using a 7805. do u have a diagram of a 7.5 v regulator using a 7805?

ericgibbs · Feb 1, 2007

hi ILE

Try the attached circuit.

If you cannot get the full range, reduce the 1K0 to 470R, ok.

EricG

iloveelectronic · Feb 1, 2007

that's awsome thx eric

Hero999 · Feb 3, 2007

The 1k resistor needs to be 120R, unless you're happy with having a minimum load of 10mA.

Brevor · Feb 3, 2007

7.5 V regulator

If the voltage in your circuit does not have to be exactly 7.5 V. look for an
LM 7808. Some of the larger distributors stock them.

Roff · Feb 3, 2007

Hero999 said:
The 1k resistor needs to be 120R, unless you're happy with having a minimum load of 10mA.

Hero, I think you're referring to an LM317. Eric is using a 7805. 120 ohms would draw about 42mA.

panic mode · Feb 3, 2007

correct...both circuits are identical....
only values are adjusted to match chip with different output

mvs sarma · Feb 4, 2007

iloveelectronic said:
hi,

i need a 7.5v regulator, but i can't find any diagram on google, can someone please post a 7.5v regulator in here please? thx

Hi

you have not indicated the load current you required?

Hero999 · Feb 4, 2007

Ron H said:
Hero, I think you're referring to an LM317. Eric is using a 7805. 120 ohms would draw about 42mA.

Thanks, I missed that.

philba · Feb 4, 2007

I don't know if the target is a pc fan like the first circuit but in that case just use +12 to one fan terminal and +5 to the other and you get 7V to the fan. that's a common trick for reducing a fan.

RODALCO · Feb 4, 2007

Or use a 7808 with a 1N4004 in series with the output which will give you 7.4 Volts.

mvs sarma · Feb 5, 2007

Hi all
LM317 is perhaps the best and you may have one fixed voltage at 7.5 and also usea concealed switch(to prevent accidental switch over,) to go to variable mode and get adjustable supply even. the advantage is it can deliver 1.5 Amps if properly heatsinked.

7.5v regulator.

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