This 6-transistor radio was sold in Japan in the 1960s. The super-heterodyne circuit for the OM band was powered by ordinary batteries.
The circuit presented with low drift is from the Motrorola LinearDatabook of 1990. The circuit...
This strobe light circuit for car spot adjustment dates to 1987, when there were no electronic resources...
An interesting solution that can be provided in some cases is the one shown in the figure in which...