redneckdan Posted May 29, 2011 Report Share Posted May 29, 2011 Hi all,I am working on a strain gauge based pressure measurement system. The general idea is that a pressure spike, roughly 100 microseconds in duration, causes a voltage increase in the system which is stored in a capacitor through the use of zenior diodes. This circuit was designed in the early 80s. The instrument and op amps are rather expensive or non-existent. I am wondering if I can find more modern/cheaper alternatives that will drop into the existing circuit or can be used with some circuit redesign. Below is the diagram.Thank you for your help. My back ground is in mechanical design and I know just enough about circuit construction to be dangerous. C4 is the capacitor that stores the voltage spike for measurement by a multi meter. Quote Link to comment Share on other sites More sharing options...
Hero999 Posted May 29, 2011 Report Share Posted May 29, 2011 The INA114 looks simialr to the AD521http://focus.ti.com/lit/ds/symlink/ina114.pdfThe OPA128 is recommended to replace the AD515http://www-micrel.deis.unibo.it/DATA_SHEETS/OPA128.pdfYou could also try contacting Analog Devices. Quote Link to comment Share on other sites More sharing options...
redneckdan Posted May 30, 2011 Author Report Share Posted May 30, 2011 Thank you for the info.I sent AD an email last night. Probably won't hear anything until mid week. Quote Link to comment Share on other sites More sharing options...
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