In the figure we have the basic way of using the 3-and-a-half-digit counter 7107. The circuit is from an Electronics Now from November 1996. It uses two dual displays.
This power source was found in an old Argentine publication from 1973. The transistor could be the...
With this circuit it is possible to monitor a signal that is being recorded on an old tape...
This circuit is from a 70s documentation. The maximum sampling rate is 800 Hz. The operational...