Circuit challenge! Inverting power

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NyxBass

Silver - Posts: 226

Joined: March 14, 2002

Location: United States

Posted: April 16, 2002 at 12:32 PM / IP Logged

Well Yeah, I know I could just go and dig out the positive dimmer wire, but I wanted the challenge. ;) I assume the lights from the dash run on a positive dimmer, 'cause they're lights, I just wanted to see if I could do it.

/NyxBass

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snowblind

Member - Posts: 19

Joined: May 05, 2002

Location: United States

Posted: August 04, 2002 at 2:15 AM / IP Logged

Just get an IC inverter. They usually have 4 wires: postive, ground, input, output. If you can't find a 'dedicaed' chip, just get a cheap op-amp that will work off a single-sided supply (+12V, versus the typical + AND - 15 V). Wire the amp as a unity-gain inverting amplifier. Done.

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HotRod53F100

Copper - Posts: 84

Joined: May 12, 2002

Location: United States

Posted: August 05, 2002 at 4:34 PM / IP Logged

Maybe I'm missing the boat here but did you ever think of this.....maybe your dimer system has a constant 12V and the dimmer is a resistor to ground??? If that were the case, the more resistance that you add would limit the current or reduce the voltage, thus bringing you closer to the 12V source voltage on the other end. How about this....12V supply...to a bulb...to a resistor...to ground. If you were measuring from the load side of the bulb, you would see exactly what you are seeing. I know that in my street rod the dome light has a constant 12V and the pin switch makes and breaks the ground. Just my thoughts..hope it helps.

HotRod

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Levishikin

Member - Posts: 12

Joined: July 25, 2002

Location: United States

Posted: August 05, 2002 at 5:15 PM / IP Logged

You can also use 4 diodes to make a bridge rectifier that will invert also.

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Circuit challenge! Inverting power

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