stable dc-dc converter - Electronic Circuits Projects Diagrams Free

fever · 10th May 2007, 11:17 AM

hello all,
i need a dc-dc converter for powering my tachometer.my motorcycle uses 12v battery. in normal condition voltage is 12v.but while running voltage increasing to 13-15v max.iam afraid this might burn off my chip.so is there any converter which takes 11-15v and give constantly 12v output supply?

and exactly for 5v shall i use 7805?or is there any other device which will handle this situation in a better way.
thanks

Styx · 10th May 2007, 12:26 PM

have a look into TRACO dcdc converters, they are simply the best
you can get ones which have a 9-18V input range and output a regulated rail dependent on the part you want

**3v0** · 10th May 2007, 12:50 PM

Search the forums for threads where people have built power regulation systems to use electronics in cars. You should find it interesting.

sundeep jangra · 10th May 2007, 01:33 PM

I have require a remote control cicuit for toy car.

Please send me the circuit.

fever · 10th May 2007, 02:33 PM

thanks i'll do that.can u guide me with some search words...
@sanpeed
before posting any data just have a look what and where ur posting.i hope u got my point.

**3v0** · 10th May 2007, 03:15 PM

Searching here is a bit of an art.

Start with 7805, car OR auto

The 7805 is a 5V regulator.
In the search results you should find other words that can be used as keywords.

Sceadwian · 11th May 2007, 03:42 AM

If you want to get 12V regulated from 11-15 you'll have to use a switch mode supply, linear supplies can not raise the output voltage above the input voltage without switching.

**3v0** · 11th May 2007, 03:53 AM

He wants 5 volts.

Sceadwian · 11th May 2007, 04:09 AM

I probably should have read that last line.

fever · 11th May 2007, 08:02 AM

well actually i want both 5v and 12v supply.
i want regulation which produce less heat.

the area where iam going to fit my tacho is around 50mm in dia with very less width.so i shld need a design which uses less number of components.and the area is fully closed,so can't think of heat generating regulators.

any more ideas regarding this issue will be appreciable.
thanks

gootee · 11th May 2007, 08:24 AM

Instead of the 7805, an LM2937 should be better for automotive-type applications.

- Tom Gootee

http://www.fullnet.com/~tomg/index.html

-

phalanx · 11th May 2007, 01:06 PM

Quote:

Originally Posted by sundeep jangra

I have require a remote control cicuit for toy car.

Please send me the circuit.

Did you crash your Hayabusa a little too hard?

**3v0** · 11th May 2007, 03:18 PM

Do you need 12V to power the circuit ?

fever · 12th May 2007, 02:19 PM

yes 12v to power tacho and 5v for battery voltage indicator circuit.

@gootee
LM2937 seems to be good.but can it handle rough both the lower and higher voltages according to the output voltage. imean from 10.5 to 15v input the output shld be 12v stable.

Hero999 · 12th May 2007, 02:34 PM

Why do you want 12V?

A SEPIC converter will do that.

There are ICs around that make building such a switched mode power supply easy.
http://www.google.com/search?client=...utf-8&oe=utf-8

Please also post the schematic, your circuit might run of 10.5V to 15V without modification.

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10th May 2007, 11:17 AM	(permalink)
fever	stable dc-dc converter hello all, i need a dc-dc converter for powering my tachometer.my motorcycle uses 12v battery. in normal condition voltage is 12v.but while running voltage increasing to 13-15v max.iam afraid this might burn off my chip.so is there any converter which takes 11-15v and give constantly 12v output supply? and exactly for 5v shall i use 7805?or is there any other device which will handle this situation in a better way. thanks

10th May 2007, 12:26 PM	(permalink)
Styx	have a look into TRACO dcdc converters, they are simply the best you can get ones which have a 9-18V input range and output a regulated rail dependent on the part you want __________________ Nothing is impossible. Once a problem is realised, the rest is just details

10th May 2007, 12:50 PM	(permalink)
3v0	Search the forums for threads where people have built power regulation systems to use electronics in cars. You should find it interesting. __________________ search engine for electronic parts Junebug USB PIC programmer kit., USB Bit Wacker, 3v0's Homepage The 15 Minute Printed Circuit Board! (+drill time)

10th May 2007, 01:33 PM	(permalink)
sundeep jangra	remote control cicuit I have require a remote control cicuit for toy car. Please send me the circuit. __________________ Rise after storm www.board4all.cz

10th May 2007, 02:33 PM	(permalink)
fever	thanks i'll do that.can u guide me with some search words... @sanpeed before posting any data just have a look what and where ur posting.i hope u got my point. Last edited by fever; 10th May 2007 at 02:38 PM.

10th May 2007, 03:15 PM	(permalink)
3v0	Searching here is a bit of an art. Start with 7805, car OR auto The 7805 is a 5V regulator. In the search results you should find other words that can be used as keywords. __________________ search engine for electronic parts Junebug USB PIC programmer kit., USB Bit Wacker, 3v0's Homepage The 15 Minute Printed Circuit Board! (+drill time)

11th May 2007, 03:42 AM	(permalink)
Sceadwian	If you want to get 12V regulated from 11-15 you'll have to use a switch mode supply, linear supplies can not raise the output voltage above the input voltage without switching. __________________ "Because I be what I be. I would tell you what you want to know if I could, mum, but I be a cat, and no cat anywhere ever gave anyone a straight answer, har har."

11th May 2007, 03:53 AM	(permalink)
3v0	He wants 5 volts. __________________ search engine for electronic parts Junebug USB PIC programmer kit., USB Bit Wacker, 3v0's Homepage The 15 Minute Printed Circuit Board! (+drill time)

11th May 2007, 04:09 AM	(permalink)
Sceadwian	I probably should have read that last line. __________________ "Because I be what I be. I would tell you what you want to know if I could, mum, but I be a cat, and no cat anywhere ever gave anyone a straight answer, har har."

11th May 2007, 08:02 AM	(permalink)
fever	well actually i want both 5v and 12v supply. i want regulation which produce less heat. the area where iam going to fit my tacho is around 50mm in dia with very less width.so i shld need a design which uses less number of components.and the area is fully closed,so can't think of heat generating regulators. any more ideas regarding this issue will be appreciable. thanks

11th May 2007, 08:24 AM	(permalink)
gootee	Instead of the 7805, an LM2937 should be better for automotive-type applications. - Tom Gootee http://www.fullnet.com/~tomg/index.html -

11th May 2007, 03:18 PM	(permalink)
3v0	Do you need 12V to power the circuit ? __________________ search engine for electronic parts Junebug USB PIC programmer kit., USB Bit Wacker, 3v0's Homepage The 15 Minute Printed Circuit Board! (+drill time)

12th May 2007, 02:19 PM	(permalink)
fever	yes 12v to power tacho and 5v for battery voltage indicator circuit. @gootee LM2937 seems to be good.but can it handle rough both the lower and higher voltages according to the output voltage. imean from 10.5 to 15v input the output shld be 12v stable.

12th May 2007, 02:34 PM	(permalink)
Hero999	Why do you want 12V? A SEPIC converter will do that. There are ICs around that make building such a switched mode power supply easy. http://www.google.com/search?client=...utf-8&oe=utf-8 Please also post the schematic, your circuit might run of 10.5V to 15V without modification. __________________ I also post at the following sites: http://www.stop-microsoft.org http://www.heated-debates.com Screen name: Aloone_Jonez