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Registered Member #177
Joined: Wed Feb 15 2006, 02:16PM
Location: Munich, Germany
Posts: 214
Hi, well I have a sensor signal (from a piezo ) which is actually just a Voltage spike. I want to feed that to a Bargraph driver, but that spike is to fast. How can I convert it in a way, so that the bar graph driver will be able to display it?
Registered Member #27
Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
Put a diode in series with the capacitor then the capacitor will be charged but not discharged and keep the voltage. Then you load the capacitor with whatever needed to decay with the time constant you want.
Registered Member #75
Joined: Thu Feb 09 2006, 09:30AM
Location: Montana, USA
Posts: 711
I think this OpAmp-Capacitor circuit is called "Integrating amplifier", you should google for that. Then you could add a high value bleeder reisistor with an appropriate time constant. Just watch that if you signal is AC (I think it is), you need to rectify it so the integral is non-zero.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141
If the 'spike' is much more than a diode drop (say 0.3V for a shotky) then just a diode and a capacitor will do. If the signal is small then you will need to amplify it since it's a 'spike' you will need a fairly fast amplifier can you estimate - the amplitude of the 'spike' - the duration of the 'spike'
Registered Member #105
Joined: Thu Feb 09 2006, 08:54PM
Location:
Posts: 408
I think an opamp would be the way to go for what your purposes are- i think that a capacitor will disharge too fast if you just try to charge it up ith the 500mV and use that to drive the chip for the bargraph.
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Signal processing, Voltage spikes?
) which is actually just a Voltage spike. I want to feed that to a Bargraph driver, but that spike is to fast. How can I convert it in a way, so that the bar graph driver will be able to display it?
