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    Batteriser - Evaluating their claim to get 80% more energy from batteries

    Hi there! I think this new product called Batteriser is a bunch of marketing hype and won't stand up to any real tests. I would not recommend anyone purchase this product and instead wait for the reviews to come out and to be very skeptical It's a stainless steel sleeve that goes over a...
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    Ideas for Single AA and AAA batteries?

    Thanks, that puts things in perspective - I checked out the datasheet of Energiser AAA and even if I only want 100mA at 5V (0.5W) and I draw 400mA-500mA at an average of 1.25V to get there, my mAh capacity of the AAA would only be around 450mA in total as per datasheet capacity discharge curve...
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    Ideas for Single AA and AAA batteries?

    Thanks, wow I'm going to check out the MAX8815A datasheet. If I can get 500mA from a AAA battery @ 5V that'd be awesome
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    Ideas for Single AA and AAA batteries?

    Hi, I have some AA and AAA batteries lying around and looking for some ways to use them. Like when you buy a 4 pack of batteries, and the product only needs 3. What to do with the left over one?? I try not to mix batteries so I'm looking for some ideas on how to use them. Some ideas like a...
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    Calculate value of base-emitter resistor for Dark Activated Light

    Ah hah. I see the problem, the LDR is too high at 4k to divert enough current to ground. The transistor requires too much base current to fully saturate and has too wide a 'window' in which it will operate but not saturate. Time to research an appropriate Darlington transistor. Thank you
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    Calculate value of base-emitter resistor for Dark Activated Light

    Thank you audioguru. Did you derive the saturation current ratio of 1/20 from the "Conditions - Base-Emitter Saturation Voltage" - collector current 10mA and base current 0.5mA from the datasheet? I think I understand your calculations, I have redrawn to confirm that I understand you...
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    Calculate value of base-emitter resistor for Dark Activated Light

    Hi, This will sound like a homework question. All I can say is that it isn't, and I'm not looking for any answers so I can pass any tests (those days are behind me, I hope!) For those interested I'm an IT professional dabbling in electronics. I am designing this Dark Activated Light for fun...
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