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.
The circuit is from a 1966 English magazine, but it can be assembled with more modern transistors such as...
The circuit shown is a documentation on 80's tunnel diodes. The frequency depends on the delay line...
This circuit has a logarithmic response sourcing signals to na analog meter. The meter is a 200 µA or...