This is the basic full-scale circuit of an LM3914 for voltage measurement or voltage triggering and control. The power supply must be within the indicated range.
We found this circuit in a Radio Experimenter Handbook from the 90s. The circuit uses 741 op amps...
In fact, it is a RF field indicator with an operational amplifier equivalent to the 741. This...
The input impedance of this circuit is about 700 k ohm and the output impedance is about 1 k ohm....