polarity inversion switch

I forgot to say that i want to hook this circuit to a battery, not an outlet. So i guess that is dc maybe? Im not too much on electronics

Depending on what the 'anything I hook up' is, the best answer could be (a) a DPDT switch (b) an XOR gate (c) a diode mixer that accepts DC on the LO port (d) a transconductance multiplier (e) a center-tapped transformer with a relay or analog multiplexer

and if we reading sci.electronics.design put our minds to it, that could stretch to (m) pretty easily.

i have 4 nine volt batterys. I made electromagnets. I want to be able to flip voltage from 9 volts to -9 volts. it doesnt matter the amps. I need the voltage to jump from 9 volts to off to -9 volts. to off to 9 volts to off to -9 volts.( if that makes any sense) I want to have something i guess like a potentiometer. but more like a button, or (a gas pedal for example). the further i turn it the more volts it will push and when i turn it the opposite way the volts will decrease. and i need it to be set like this: at 1 volt i need to switch from 1 volt to off to -1 volt10 times a second. and at 9 volts i need to switch from 9 volts to off to -9 volts 90 times a second. I need to hook the chip up to two batteries at one time. as you can see im not too good at electronics but i hope someone can help me. I might need to give somemore information. im not sure tho.

OK, that's enough to go on. A 9V battery might have 5 ohms output resistance, so toggle switches, relays, and MOSFET bridges are possible elements to perform the function.

Switching an electromagnet, however, is VERY stressful; switching the ignition coil in a car both generates the 40,000 V that goes to the spark plug, and wears out a set of 'points' on a regular schedule (old cars used points). The magnetization doesn't switch immediately, by the way. That 5 ohms resistance in the battery combines with the resistance and inductance of the electromagnet to make a turnon delay.

This kind of switching is built in to some switchmode power supply control chips; you describe a control voltage that changes the switch frequency, and that is similar to PWM full bridge control function. There are single-chip items to drive motors that might fit your need exactly, see

for a typical such item (it has two sections; you might only need one). Web searches for "PWM" and "full bridge" will get you lots of suggestions.

Alas, by the time you get any such solution up and running, you WILL know a lot about electronics. Thirty years ago, I'd have suggested 'get a vibrator', there were vacuum-tube era canned solutions to this problem in all the old auto radios.