The figure shows how to use the LM3914 bargraph with expanded scale. The circuit has two adjustments determining the extremes of the LED excitation scale.
Found in a 1990s Popular Electronics, this circuit produces a tone on a small speaker. The keyer...
Found in a 90s Popular Electronics, this circuit monitors an RF signal providing a DC output. The...
We found this circuit in an English publication from 1980. It provides a logical output signal when...