This circuit is from old documentation, using a component that cannot be found easily today. The indicator is a galvanometer, and the input voltage is in the order of 1 V.
In the figure we have an application for NLAS5113, a new device from on Semiconductor...
This circuit, which draws numbers from 00 to 99, was found in an Italian magazine from 1974, but...
The filter shown in the figure, suggested by Motorola, operates at a cut-off frequency of 1 kHz,...