Dropping the voltage

What is the easiest and cheapest way to drop from 12V to +-7V ?

Thanks

An adjustable 12v power converter..any radio shack/bestbuy/CC etc. should stocks these pretty cheap. They are typically on a cigarette lighter type plug but you can solder wires to it if you wish to hardwire and hide it..cake.

You could build one yourself if so inclined but to help you I would also need to know the current demands of what you are hooking up..might be as simple as a resistor depending.

Good Luck

typo, my bad.

It is for the hal sensor in a cars distributor. Current draw should be like almost nothing.

It runs on 7v, so it just need to come down from 12v.

Thanks.

 A resistor is not the way you need to go.  If you can not find an adaptor as Master referred to with a 7 volt out, you can build a regulator with only a few components probably available locally in larger cities.     An npn transistor, a 7.2 volt zener diode and a resistor.    If you can't find an adaptor let me know will send wiring info for the circuit.

Cannot get the adapters in my town, will have to try in the bigger places.

Can you supply me with the circuit please ?

I can get electronic components needed to make one.

Just give me the list and diagram and I'll be able to sort it from there.

Thanks

the 2n6488 is an NTE 331                    the zener diode is an NTE  5072A

The easist thing would be to use an adjustable voltage regulator..

http://www.nteinc.com/specs/900to999/pdf/nte956.pdf

But.. I have to ask, what are you trying to do with the hall effect switch?

Jim

Great, thanks.

It is for use in the car itself.

Not using the TP100 anymore which was also supplying the 7V to the hal sensor.