This sample and hold circuit is from a 1969’s documentation. However, it can be built with modern equivalent components, including the matched pair of transistors.
This circuit was found in the May 1970 issue of Radio Electronics magazine. The circuit uses...
We found this simple preamp circuit with only one transistor in a documentation from the 70s. The...
This 1 kHz filter was found in the March 1997 issue of Electronics Now magazine. The circuit is...