That IC(Nigel use) is available here on one shop but it is enough coastly... Therefore i am asking some other techniques using low coast components..

Haha

 

But how would we know what components are cheap other there?, the 7660 is a common cheap IC.

Easiest solution, use two 9V batteries!.

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The ICL7660 IC is only $.80US at Digikey. They have thousands of them.

__________________
Uncle $crooge

 

well lucky you but in southern Italy even professionals can wait months for parts

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I didn't know that Italy is a 3rd world country.
Don't you have electricity and running water yet?

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Uncle $crooge

 

hehe electricity yes some places out in the sticks get their water from a suface run mains pipe and some houses just have wells most people buy bottled water to drink anyway. anyhow in many respects I consider southern Italy a third world country especially mentality wise. oh they have electronics fairs but they seem to be top secret I have never seen any advertised

__________________
I AM the exeption that disproves the rule in many ways but the rules still apply (unfortunately)

my site:www.simons-photography.com
http://rushdenrotaract.org.uk

 

Are you in jail in Sicilia? No wonder you can't get electronic parts.

__________________
Uncle $crooge

 

Even a 555 timer can be used to generate a negitive power supply, both cheap and readily available!

http://sound.westhost.com/project95.htm

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Because you want to supply opamps it seems that you need not a lot of current.
Use may a simple square wave oscillator ( like a 4093 or 7414 or 40106 schmitt gate with a resistor in feedback from output of the gate to input and a Cap from the input to GND) to drive a Diode-capacitor ladder voltage pump/doubler/inverter to generate any positive or negative voltage.





http://www.coolcircuit.com/circuit/voltage/vt.GIF

 

Thanks.....

Thanks u HERO999
I think it is the good solution for me cuz it is easy and cheap also and can provide +-12volts...

Again Thanks all.

 

That 555 timer circuit won't produce -12v from +12v, more like ~-10.8V because of the voltage drop of the diodes. It'll still work fine for opamps though. You could use one 555 timer circuit to make 9.4V (a booster circuit) and then another to make -9V.

Just thought I'd mention it

Blueteeth

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Inconsistency is the key to flexibility!

 

Yes, but if you read the text it does say that the output is 12V assuming the supply is 13.8V

If you only want a really low current supply then use a CMOS 555 with Schottky diodes for a lower voltage drop.

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http://www.stop-microsoft.org http://www.heated-debates.com
Screen name: Aloone_Jonez
And http://www.silicontronics.com, same screen name as here.

 

hehe no I am in a mentally underdeveloped place call Alberobello in Puglia, check out my site if you want to see some of it, they are great at having their rights trodden on here.

__________________
I AM the exeption that disproves the rule in many ways but the rules still apply (unfortunately)

my site:www.simons-photography.com
http://rushdenrotaract.org.uk

 

I get a lot of my voltage regulators and even transistors from my local TV repairman's junk ben. Junk computer monitors can also be a good source.

 

hm I did come up with a circuit for making a neg and pos from a single, but never fully tested it just the principle

__________________
I AM the exeption that disproves the rule in many ways but the rules still apply (unfortunately)

my site:www.simons-photography.com
http://rushdenrotaract.org.uk