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 circuit was found in a 1992 publication. The circuit uses common components and includes the...
This protection circuit for battery chargers was found in an old Elektor. The relay is according to...
This very low frequency amplifier has a gain of 1,000 and was found in a 1967 documentation. The circuit is...