Inverted Pulsed output to steady output
Posted: Tue Jul 03, 2012 11:29 pm
I'm trying to solve a simple solution elegantly with as few components as possible.
What I have is a 3V signal that when "off" is a constant 3V. When on it pulses to 0V for 100us, then back to 3V for 150us, then back to 0V over and over.
What I want is to have a constant output of 0V when the input is 3V, and 3V when it is pulsing high/low.
I can use an inverter to change the input to 0V constant, then pulsing high, and perhaps a cap at the output to then smooth that wave, but I was thinking instead of needing an inverter with 5 pin connections to perhaps something like a diode and capacitor to send the negative signals to the capacitor only, and the output in series with the cap, but I can't quite get my head around it - I sort of know what I want but not sure of its implementation.
Oh, and the output needs say 5mA but ideally 20mA output. The input provides that though if needed.
What I have is a 3V signal that when "off" is a constant 3V. When on it pulses to 0V for 100us, then back to 3V for 150us, then back to 0V over and over.
What I want is to have a constant output of 0V when the input is 3V, and 3V when it is pulsing high/low.
I can use an inverter to change the input to 0V constant, then pulsing high, and perhaps a cap at the output to then smooth that wave, but I was thinking instead of needing an inverter with 5 pin connections to perhaps something like a diode and capacitor to send the negative signals to the capacitor only, and the output in series with the cap, but I can't quite get my head around it - I sort of know what I want but not sure of its implementation.
Oh, and the output needs say 5mA but ideally 20mA output. The input provides that though if needed.