This high quality circuit with complementary symmetry was found in an Electronics World of 1966. It can be made with modern transistors like the BD or TIP series.
In the figure we have the way to use a common multimeter as a field strength meter. RF shock...
This RCA / GE circuit from the 90s can be applied to any modern operational amplifier. The number...
This circuit was originally designed to maintain the temperature of a brooder at 41º C. However,...