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    A simple transistor switch for an LED light.

    Wow, awesome reply! I'll have to try that circuit out this weekend.
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    Electronic Fuel injection enhancer

    It sounds like your on your way to revolutionizing the way our cars are powered. However, before you do that, maybe you should have a little fun first and consider a Nitrous kit for your car? At least you'll get to school a little faster! You might end up paying more for speeding tickets though.
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    Electronic Fuel injection enhancer

    Doing a quick google search, it looks like NOx stuff is pretty bad. Nitrous Oxide (N2O) is laughing gas. According to http://www.alphanutrition.com/environment/carsepa.htm "Under the high pressure and temperature conditions in an engine, nitrogen and oxygen atoms in the air react to form...
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    Electronic Fuel injection enhancer

    For running leaner, couldn't you a) reprogram the ECU or b) trick the O2 sensor to think that it is runner richer than what it really is? FWIW, I have learned from experience that it is not always a good idea to "customize" your car. Modifying your car engine can have unintended side-affects...
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    A simple transistor switch for an LED light.

    Hi all, I want to make a very simple circuit. I have a few components that I have dug out of storage from when I took some electronics courses way back in college. I want to learn some stuff about transistors. The description of the circuit is to use a NPN transistor switch to power an LED...
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    Cell Phone "AA" BATTERY Replacement...

    Audioguru, I'm starting to see your wisdom in your recommendation to use the rechargeable battery that came with my phone. However, my morbid curiosity is getting the better of me here. I noticed an LC circuit in between the battery input for this chip (TPS61122, switching boost converter) and...
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    Cell Phone "AA" BATTERY Replacement...

    But the specs quote max voltage = min voltage = preset voltage = 3.6V. I thought that no matter what voltage you put in from 1.8V to 5.5V, you would always get 3.6V period. If this isn't the case, what kind-of voltage do you expect to get from a 5.5V input? I wasn't too concerned about getting a...
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    Cell Phone "AA" BATTERY Replacement...

    Really?!? I had no idea. Maybe I should do that. I don't think that's really a feasible idea for me (just kidding). I always have to do things the backwards way first and then realize there is a reason for doing it the way it is done in the first place. That, unfortunately, is the only way I...
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    Cell Phone "AA" BATTERY Replacement...

    I have no idea! I hope so... I won't know until I see it. I'm getting a free sample off of the TI site. I had no idea that a little cell phone would be drawing that much power?! So maybe it's back to the drawing board. I found some battery holder's online through batteryspace.com. It is a...
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    Cell Phone "AA" BATTERY Replacement...

    Can anyone recommend a 2 "AA" battery holder that doesn't take too much space? My current designs for a prototype will be to use a 2 "AA" battery holder, solder some wire to the leads to my little switching voltage regulator, and then connect the output of the voltage regulator to the cell phone...
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    capacitors

    Capacitors have a variety of functions. If you have an alternating voltage source (AC) and stick it in a circuit with the capacitor, the capacitor acts as a short-circuit. If you have a DC voltage source and stick it in a circuit with a capacitor, the capacitor effectively acts as a...
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    Cell Phone "AA" BATTERY Replacement...

    I have decided on: TPS61122: Synchronous Boost Converter with 1.1A Switch and Integrated LDO Is this a good choice? The specs: "3.6-V 95% Efficient Boost Converter with 3.3-V 200-mA LDO for 1-Cell LiIon or Dual-Cell Applications" 1. Topology: Boost 2. Min Vin:    1.8 3. Max Vin:  5.5 4...
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    Cell Phone "AA" BATTERY Replacement...

    Thanks for the link. Looks like I'll have to do a little bit of research to figure out what all the parameters mean... in the meantime, what are some of the favorite and more popular switching voltage regulators out there?
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    What is a voltage regulator?

    Thanks for all you guy's inputs. What a great forum board! I guess I have a some options: 1. Possibly using 3 "AA" batteries (I need to check the topped off voltage of my rechargeable battery). 2. Using a "series linear" voltage regulator to step a 9V source to a 3.7V source. 3. Using a...
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    Cell Phone "AA" BATTERY Replacement...

    I guess I don't really care about the practicality about it! I figure there are worse things I could be doing with my mind and my money... and if I happen to learn a couple things on the way, how bad could that be for me? What non-linear voltage regulators can you recommend?
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    Cell Phone "AA" BATTERY Replacement...

    Speaking of a step-up voltage regulator, are there any voltage regulators capable of converting 3V to 3.7V?
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    What is a voltage regulator?

    Yes, the more general term. Say you have an input voltage that is higher than what you need. E.g. 9V. What if you wanted to reduce that voltage to 3.7V without any power losses (to maximize power efficiency). I understand that in order to do this I could make a dc to dc converter that basically...
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    Cell Phone "AA" BATTERY Replacement...

    Actually, I have a LG VX3200. A very basic $20 phone from Verizon. Horrid battery life. This wasn't even really intended to fit inside a cell phone. I don't see how it could either. I imagine I could tape/velcro the batteries to the back cover somehow. It wouldn't be for looks. I just really...
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    Cell Phone "AA" BATTERY Replacement...

    Luckily, on queue, my cell phone started beeping me indicating a low-battery. I measured the leads of the cell phone battery at 3.45V. If I can assume that this is my minimum voltage, then the range of voltage I want to get from "AA" batteries is 3.45V - 3.7V. The question is, can I get this...
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    What is a voltage regulator?

    Thanks! Mike
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