This circuit is from the 1983 Intersil Databook. The display is plasma and must be excited by a high voltage circuit. The components used in this configuration are not common today.
This 5-transistor receiver for the medium wave range was described in an article in Radio...
This circuit was originally designed to maintain the temperature of a brooder at 41º C. However,...
This circuit is from old documentation but uses components still common in our market. The circuit...