This toy transistorized organ was found in the May 1970 issue of Radio Electronics magazine. The trimpots are adjusted to the musical notes according to the key.
This circuit is from old documentation but uses components still common in our market. The circuit...
This circuit was found in a 2006 publication. It uses discrete components and CMOS that are still...
Found in a Popular Electronics from the 90s, this digital probe uses common components....