As the title suggests, i'm now stuck with another problem. After solving the DC voltage averaging circuit (see post http://forum.allaboutcircuits.com/showthread.php?t=5075 ), i now need to somehow "latch" or "store" the voltage level.
So for example, i have a DC voltage input of 5Vdc. i need a circuit or IC that can "remember"/"latch"/"store" this 5Vdc, even if the input now drops from 5Vdc to 2Vdc.
The input ranges from 0-10Vdc, so the circuit or IC should be able to "store" any levels within the range.
I tried the capacitor charging method, and the voltage only holds for 1-2seconds before dropping down to 2Vdc. i'm looking for a solution that would last for a longer time, maybe even a few hours. A supercapacitor might work, but again, the charge time would be very long. A maximum response time of less than 2-3seconds would be prefered.
Currently i'm trying to limit the circuit to purely analog, i know it would be a piece of cake using a digital solution.
Thanks for any suggestions!
So for example, i have a DC voltage input of 5Vdc. i need a circuit or IC that can "remember"/"latch"/"store" this 5Vdc, even if the input now drops from 5Vdc to 2Vdc.
The input ranges from 0-10Vdc, so the circuit or IC should be able to "store" any levels within the range.
I tried the capacitor charging method, and the voltage only holds for 1-2seconds before dropping down to 2Vdc. i'm looking for a solution that would last for a longer time, maybe even a few hours. A supercapacitor might work, but again, the charge time would be very long. A maximum response time of less than 2-3seconds would be prefered.
Currently i'm trying to limit the circuit to purely analog, i know it would be a piece of cake using a digital solution.
Thanks for any suggestions!