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...