This circuit was obtained in a QST magazine from the 90s. The circuit makes use of components that are uncommon today. The circuit includes a gain selection switch.
This biestable touch circuit was found in American 1980s documentation. The circuit must not be...
This simple electronic toy organ produces an interesting sound, which can be used by the most...
This circuit is from an old documentation from 1995, but it can be easily assembled today by the...