Found in an old Popular Electronics this circuit appears in other variations on this site and in this section. It uses a 7-segment common anode LED display as an indicator.
This 1 A circuit was found in a Philips documentation from 1966. The transistor is of the time,...
This FM transmitter circuit was found in a Japanese publication in 1975. Equivalent transistors can be...
In the figure we have the basic configuration of a 5 V regulator using an operational 741. In this...