S-meter on the receiver - Circuit-Diagramz S-meter on the receiver, S-meter on the receiver, and Circuit Diagrams Battery Discharger Battery tester Blog Cable TV Circuit Diagrams Calculator & Measurement Camera Technology Circuit Diagram Softwares circuit elements pinout Clock & Timer Circuit Diagrams Counter Circuit Diagrams Datasheets DIY-Tutorials Electronic Keys & Locks Embedded Adding an S-Meter to a Hallicrafters S-38 Radio A Suggested Circuit and Installation Instructions for Installing an "S" Meter on the S-38 Series Receivers . An "S" meter installed according to the above diagram will have one lead connected to B- and in this type of receiver B- is connected to one side of the AC line. S Meter Circuit - QSL I have found that any meter from 200 microamp sensitivity on down will work in this circuit. Surplus CB radio meters work great. Adjusting the S-meter is simple. Ground the AGC line on the IF strip, then adjust the full scale variable resistor for full scale reading on the meter.