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Voltage measurement attenuator amp - del20013LF356 opamp FET input is in a inverting amplifier configuration here. R4 + R5 make up Ri each 1/4 W MFR withstands 250V so both will take upto 500V. Use more in series for higher voltage withstand with care in PCB layout and cabinet insulation.Rf is selected by a digital value at A-B inputs of 4052, that way R1, R2, R3, R6 are selected for four ranges giving various attenuation levels. The important thing in this circuit is the on resistance of 4052 of 100 ohms comes in series with the output resistance of opamp, so the output is taken before the cmos switch . The output of this digital attenuator should not be loaded and should be buffered before use. Gain = Av = Rf/Ri and Vout = -(Rf/Ri) * Vin To view the circuit below, Click the Link of PNG or PDF and view the Circuit, PNG can be Scrolled with Mouse and PDF can be Viewed-Zoomed in the Browsers with Acrobat plugin. The Javascript and Images must be enabled in your Browser. |
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| Voltage measurement attenuator amp - del20013 |
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Data sheets and info useful to study and build this circuit. LF356 - JFET Input Operational Amplifiers Product Folder - Fairchild P/N CD4052BC - Dual 4-Channel Analog Opamp Voltage Limiting Diode Applications Transient Analysis Tools |