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ranges upto 150cms are achievable using sharp IR sensors. these work on the principle of triangulation and provide an analog output. they are very reliable but can cost upwards of $10
check:
Sharp IR Rangers Information
Sharp GP2Y0A02YK0F IR Package
What you need is a charger for a 3.7V 800mA Li-ion(?) battery. This can be accomplished by using simple wall-mount 5V adaptor. The adaptor output is then given to the actual charging circuit. This circuit should have a dedicated battery charging IC (depending on the battery chemistry) and a few...
The DC-DC converters mentioned by Brian usually are described as being 'awesome'/'great' depending on manufacturer. You will get them for all sorts of specifications for +/-5V output. But they also tend to cost a little more than other options.
I still recommend that you try out the circuit...
the series that i gave you is easily replaceable by other manufacturers like Maxim/National/Linear/Intersil, with varying performance for same pinout ... you should have no issues in finding a replacement. In any case the manufacturer is National and the part is very popular
You can use MAX660 by National Semi. Works good. Check the datasheet for details. Are you sure your op-amps will consume 300-500mA? Try to verify that with a table top dc power supply.
@alexan_e .. yes ... right .... the result showed that the resistance should be around 12Ohms, which i assumed to be because of tolerance and ammeter resistance
@alexan_e .. reperformed the test using your guideline ... IT WORKED... its still overloaded, but atleast i can see it's following ohm's law .... getting a difference of about 0.5V between the earlier setup and the current setup. ....
!!!THANKS!!!
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@pranam77 ... agree with you, its of chinese make and was available cheap ... so got it for testing ... it actually cost me 150 Rs. ... but is thankfully not a linear one as you mention ... those are the ones that come for 25 Rs. ... damaging stuff ....
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@FvM an Hussain, .. I'm not blaming Ohm's Law for anything. I've checked the adaptor with a variable resistor, noted the characteristics and then posted in this forum. I'd already come to the conclusion that the device cannot supply the stated power and that the maximum capability seems to be...
@alexan_e .... checked it with an oscilloscope from Hz to MHz range, there's hardly any ripple in the output (0.1Vp-p) ... Is there a possibility that the adaptor internally compensated/filtered the ripple, but ends up reducing the output as well..?
@hussain .... I agree with the P=IV part...
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