Sample and hold circuit

162

02:13:25

Just press and unpress the key where u want the waveform,if u want continous waveform u have to press that key again and again ,this not a disadvantage ,this ckt is designed keeping in mind that some circuits  requires the output to be of a finite duration.:-))

published 12 years ago

hamilton1300

12 years ago

Why the first amp? I found it will work as well with out it

TECHDUDE125

12 years ago

I agree.

UncleRick

12 years ago

Onr reason for the exitance of the first amp is to provide load isolation. The source voltage being sampled may not be able to withstand the instantaneous load that the 1uF cap would present. If the source circuitry was high impedance, the sudden load fom the capacitor might disrupt that source circuitry. The high impedance of the first opamp would not present a significant load. The same idea as the input to a high impedance volt meter is less likely to load down a circuit being measured.

UncleRick

12 years ago

I meant "One reason for the existance..."

hamilton1300

12 years ago

Ok that's a good idea and makes good sense.

UncleRick

12 years ago

Thx hamilton. (I gotta get that spel cheker fixd.) :o)

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