The figure shows how to use the LM3914 Bargraph with an external reference voltage source. The reference cannot be greater than the supply voltage.
Found in a 1968 EEE, this circuit accepts frequencies from 1 to 1000 Hz and control voltages from 0.1 to...
We found this circuit in a Radio Experimenter Handbook from the 90s. The circuit uses 741 op amps...
The amplifiers of the LM3900 can also be used as voltage comparators in several projects. The...