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Hi,
it may be due to processor over heat, first feel the air flow from processor fan and heat emission. may some dust is accumulated over heat sink over a period of time. it is a common problem for old laptops
Hi,
you have to confirm the operation of both uln2003 and micro controller. isolate the pin-1 of 2003 and apply 5v directly to check its operation. if its operation is fine you have to check the Mc output port configuration
Hi,
you can construct your project in two ways, 1- with leaf switches and 2- up and down counter using encoder wheel to reel drum and combination of both.
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please go through the idea
first you wright down all the ic numbers in your ups and search for data sheets to find pulse width modulator used in your UPS. by modifying feedback loop/network you can reduce output voltage slightly.
it is difficult to find boost converter which will operate below 2V of power source, such chips will found in mobiles and difficult to solder for hobbyist. it is better to wire solar pannels in such a way to give 4V and above, so we can use commonly available boost converters. any how i found...
connect a 1k or 10k pot in place of thermistor and vary the resistance value. at some point circuit becomes healthy, now you can select a new thermistor which provides that resistance value at room temperature.
it is normal practice of some manufactures to provide bridge at incoming power. bridge protects the circuit from DC polarity mis match. how ever the power connector polarity orientation the bridge yields correct polarity to circuit.
i have a doubt on charger output voltage, you want to charge a single battery or battery bank, it is not possible huge variation in output voltage.
In any type of charger SMPS/Buck converter it will have two feedbacks current limit and voltage limit, if battery is deep dicharged battery draws...
Hi, Medium wave and short wave bands will have intermediate frequency stages scince due large bandwidth/frequecny range. the RF amplifier gain is not equal for all receiving radio chanels at different frequencies due to passive components. so what ever the desired frequency we are receiving we...
first you have to understand the UPS operation modes and finally you have to hack/modify your inverter. the UPS operation modes are 1)OFF-Line 2) ON-Line 3) Line-Interactive.
OFF-Line is similar to your inverter, IN online mode both raw power and battrey will feed the DC bus and inverter is...
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