Hey I have a circuit like this, I am powering this circuit with a 6v alkaline battery, the circuit works just fine with 100uf capacitors. But the problem is I want to replace the …

Hi everyone, Many people seem to run their projects off the mains (e.g. with a wall wart) or from a battery, but there doesn't seem to be too much discussion about how to run a de …

Here's the circuit I'm working on, it's a robotic stringed musical instrument thing, that uses 6 DC motors and an Arduino Duemilanove - The resistors are 0.25w 1KΩ The transis …

i have a 1.25 to 28 V variable power supply I'm working on. here's the schematic: Schematic link What I'd like to do is put in a fan (12v 0.16A) so it runs when i turn it on, how …

How do I calculate how long a battery operated product will run? Here's what I've got: 2 AA, 1.5V, 2700mAH batteries Voltage Regulator with a Iq of 25 uA Voltage Regulator Eff = …

I'm trying to find an off the shelf plug in ac/dc power supply unit to work with my project. I want to power an Arduino Duemilanove and six 12v 1A solenoids. Here's the solenoids - …

For my projects I have always used hacky power supplies: wall plug + 7805, a usb port or an ATX PSU. I am looking at getting into 3.3v circuits and I am having trouble getting hold …

I'm working on a little sensor platform that runs off of batteries. I'd love to be able to trigger an alert when the voltage gets too low. The problem is that anything I use to m …

Is there any way to monitor what is being sent to the WT-11 module via UART? I'm trying to implement deep sleep on the WT-11 and can run the iWRAP "TEST DEEPSLEEP" command succe …

Hiya :) I'm trying to get my ArduinoBT to be a bit more power friendly, I have it running in a sensor network and it is constantly drawing power. I want to be able to turn off or …

I have a project where I'd like to convert a .5V, 800mA supply (a solar cell) to at least 3V with as much efficiency as possible. I've seen DC boost converters, but all the ones I' …

I'm designing a board that can be powered either by USB or an ATX power supply. They can both be plugged in at the same time, independently. I'd like the ATX to provide 5V if its …

Hi all, I have no vocabulary for this, so forgive my clumsiness in explaining... I need to hook up a power supply to use with solenoids and an Arduino, but I'm not sure where t …

I am looking to power a PIC microcontroller with a supply voltage that ranges from 4.5V to 18V. This will be a battery powered device so I would like to conserve power, ie. linear …

What's the correct DC Adapter to use with Arduino? Voltage etc?