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Measures 10mV to 50Volt RMS in eight ranges Simply connect to your Avo-meter set @ 50uA range Circuit diagram Parts: R1 909K 1/2Watt 1% Metal Oxide Resistor R2 90K9 1/2Watt 1% Metal Oxide Resistor R3 9K09 1/2Watt 1% Metal Oxide Resistor R4 1K01 1/2Watt 1% Metal Oxide Resistor R5 100K 1/4W Resistor R6 2M2 1/4W Resistor R7 82K 1/4W Resistor R8 12K 1/4W Resistor R9 1K2 1/4W Resistor R10 3K3 1/4W Resistor R11 200R 1/2W Trimmer Cermet C1 330nF 63V Polyester Capacitor C2,C3 100uF 25V Electrolytic Capacitor C4 220uF 25V Electrolytic Capacitor C5 33pF 63V Polystyrene Capacitor C6 2u2 63V Electrolytic Capacitor D1-D4 1N4148 75V 150mA Diodes IC1 CA3140 Op-amp IC2 CA3130 Op-amp SW1 2 poles 5 ways rotary switch SW2 SPDT switch J1 RCA audio input socket J2,J3 4mm. output sockets B1 9V PP3 Battery Clip for PP3 Battery Notes: Connect J2 and J3 to an Avo-meter set @ 50uA range Switching SW2 the four input ranges can be multiplied by 5 Total fsd ranges are: 10mV, 50mV, 100mV, 500mV, 1V, 5V, 10V, 50V Se...

This Precision full wave Rectifier Circuit Diagram   provides accurate full wave rectification. The output impedance is low for both input polarities, and the errors are small at all signal levels. Note that the output will not sink heavy current, except a small amount through the 10K resistors. Therefore, the load applied should be referenced to ground or a negative voltage. Reversal of all diode polarities will reverse the polarity of the output Since the outputs of the amplifiers must slew through two diode drops when the input polarity changes, 741 type devices give 5% distortion at about 300 Hz. Precision full wave Rectifier Circuit Diagram  Sourced By: http://circuitsstream.blogspot.com/2013/07/precision-full-wave-rectifier-circuit.html