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  • sblocc10 followed sblocc103 months ago
  • i have a small arudiono project running (a weather station including a 96x64 oled display, as well as some extra stuff) with buzzer sound, led's etc etc.. plus i want to have it run and charge via a 4x AA nimh batteries, because that fits nicely in my setup-box.. has enough mAh at 5v .... i tested it with normal 1,5v batteries and it goes well for about few days.. i also got a brief instruction from allaboutciruits.com to charge 2xAA batteries with a PWM pin steering a IRF510 MOSFET all from a 5V source.. i got all together but the empty bateries have about 4,2 V and the arduino begins to startup at roughtly 4,5 V i guess and if i let it go for 4-5 hours at 1A 5V phone charger its almost done after minutes...so i googled around for a voltage doubler and all i found were simple ac-dc c...

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    i have a small arudiono project running (a weather station including a 96x64 oled display, as well as some extra stuff) with buzzer sound, led's etc etc.. plus i want to have it run and charge via a 4x AA nimh batteries, because that fits nicely in my setup-box.. has enough mAh at 5v .... i tested it with normal 1,5v batteries and it goes well for about few days.. i also got a brief instruction from allaboutciruits.com to charge 2xAA batteries with a PWM pin steering a IRF510 MOSFET all from a 5V source.. i got all together but the empty bateries have about 4,2 V and the arduino begins to startup at roughtly 4,5 V i guess and if i let it go for 4-5 hours at 1A 5V phone charger its almost done after minutes...so i googled around for a voltage doubler and all i found were simple ac-dc converters with diodes and capacitors, as well as dc-ac converters which still need a switching 555 unitthen there are voltage dividers using only resistors.. a small child can figure out how to put that together !so my question was how can i raise a DC voltage using 9 pcs amplifier transistors (or the 2nd power tarnsistor) that i currently have in my pocket, and the other parts listed above !!

    really??and what must this circuit look like??f.ex. i had seen one that chrges 2 pcs over a 5v mobile phone charger (or usb if you like).. and only has integrated a temp sensor that swiches the whole cicuit off if more that 30°C are reached..

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